Product by Cooper

Indentation Testing Machine

Introduction

The Indentation Testing Machine CRT-IND for determaing the resistance to penetration of road and mastic asphalt by loading a cylindrical pin and measuring the indentation in a sample over a given time. The CRT-IND comprise of a frame incorporating a stainless steel water bath with drain facility, method of applying the 500 Newton load and means of recording the test results. Immersion heater is not included but can be offered as aditional equipment. The appratus conforms tothe requirments of EN 12697-20. The maximum normal size of the aggregates should be less or equal to 16mm. It comes with optional auto data logging software which saves test data files, shows a graphical representation of the test in real time, reduces operator involvement and thus eliminates chances of error.

Features

  • Auto data logging software available which:
    • Reduces operator involvement
    • Eliminates chances of error
    • Generates graphical representation of the test in real time
    • Saves operator data, sample information data, time, and pertinent information relevant to the specific sample on test
    • Reduces test costs significantly
  • Heater element to comply with both temperatures requested by EN standard
  • Stainless steel
  • Temperature controlled water bath with drain facility.
  • Digital indicator with digital communications.
  • CE Marked and Made in United Kingdom.

Appliicatons

  • Determines the depth of indentation.
  • To test the behavior of mastic asphalt, rolled and other such asphalts.
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Prall Tester

Introduction

High quality, repeatable and reproducible machine, complies with EN 12697-16 A. Dual chambers for reduced variability Studded tyres greatly reduce skidding and accidents on snow or ice covered roads. However, all too often the studs come into contact with the road surface. The use of studded tyres is very costly in terms of annual load wear. Additionally, as the studded tyres wear the pavement they eventually cut ruts in the road that can fill with water to create a hydroplaning hazard in wet weather. A further issue is the polluting dust that is created. The Prall Test (Method A) has proved to be the most successful way to investigate abrasion due to studded tyres. At the same time reproducibility has been an issue. At Cooper we have assessed the aspects of the test crucial to performance and improved them, via the fitment of a second test chamber, thus significantly reducing variability. The CRT-PRALL is designed to carry out the Prall Test according to EN12697-16 Method A in which a cylindrical specimen of asphalt having a diameter of 100mm and a length of 30mm is tested at a temperature of 5°C. The specimen is worn by abrasive action over a standard time period of 15 minutes by 40 steel spheres. The loss of volume in millilitres is recorded and reported as the abrasion value.

Features

  • Robust and high quality stainless steel test chambers x 2
  • Inlet and outlet ports are connected to flexible hoses via quick release adaptors
  • Comes with a replaceable insert with glued rubber (neoprene) plate to fix to the upper surface of the lid
  • Efficient locking guard system to satisfy CE legislation
  • Fitted drain
  • Supplied with spheres made of stainless steel according to ISO 3290
  • Fitted with 'flow controller' on the chamber lid inlet port to regulate the flow of water to each chamber
  • Flow of water to each chamber is variable over the range of 0 to 4 litres per minute, greater control and flexibility
  • Precision engineered equipment with controlled flow of water to each chamber, to an accuracy of 0.2 litres per minute
  • User friendly, state of the art PLC based control system, mounted within its own enclosure to allow positioning away from the equipment
  • Made in the United Kingdom, Fully CE marked

Applications

  • Determination of wearing of asphalt pavements
  • Investigation of abrasion due to studded tyres
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Accelerated Polishing Machine

Introduction

The Cooper-Wessex Accelerated Polishing Machine is the industry standard device for the determination of the Polished Stone Value PSV Wessex Engineering first manufactured an Accelerated Polishing Machine CRT-APM over 30 years ago, and were involved both in the development of the machine and the test procedures. Wessex has sold more than 1000 APMs globally. In 1950 increased traffic flow and higher speeds, together with concerns about road safety led to research into the relationship between road materials and skid-resistance. Research at the UK Transport Road Research Laboratory showed a significant relationship between polishing of aggregates used in road surfaces and skid resistance. Tests were devised using an Accelerated Polishing Machine and a friction measuring device (known as the Pendulum Skid Tester, also supplied by Cooper-Wessex), to determine a Polished Stone Value (PSV). Fourteen specimen aggregate samples are clamped around a rotating Road Wheel. These samples are subjected to two timed stages of abrasive polishing under a loaded rubber tyre. First by Corn Emery grit, and secondly by Flour Emery powder. As the best quality market leaders Cooper-Wessex have recently been copied by low quality manufacturers. Imitators' machines may look similar, but precision, repeatability and reproducibility come only with years of experience.

Features

  • High ground steel main spindle running in precision sealed ball bearings additionally protected by a labyrinth seal spindle axially loaded to eliminate end play
  • Adjustable 3 phase motor speed control with adjustable timing belt drive, reducing power consumption and improves control
  • Inverter drive to motor for precise speed control
  • Digital display preset timer and revolution counter
  • Robust welded steel mainframe, standing on adjustable pads
  • Specimens manufactured and easily removed from precision machined moulds
  • 14 Specimens located on 'Road Wheel' by rubber rings and held by simple side fixing
  • Tyred wheel easily removed for replacing tyres
  • Water gravity fed from high level tank through calibrated flow meter
  • Used abrasive and water collected in easily removable tray
  • Loaded tyre raised and lowered to the running surface by mechanical lifting device
  • Protection by covers and guards may be easily removed for maintenance
  • CE marked
  • ASTM option with pneumatic wheel

Applications

  • To produce polished stone samples of aggregates used in road surfaces, to simulate actual road conditions
 


Aggregate Abrasion Machine

Introduction

The Cooper-Wessex Aggregate Abrasion machine determines the AAV by testing the measure of the resistance of aggregate to surface wear by abrasion Inadequate abrasion resistance of road surfacing aggregates means an early loss of the texture depth required to maintain high speed skidding resistance. The Cooper-Wessex Aggregate Abrasion machine determines the Aggregate Abrasion Value by testing the measure of the resistance of aggregate to surface wear by abrasion. Two specimens are pressed against the surface of a steel disc rotating in a horizontal plane, with a force of 0.365 Newton's per sq. centimetre. Sand, fed by hoppers, is used as an abrasive. After 500 disc revolutions the amount of material abraded is measured by calculation of the weight loss of the aggregate. The percentage loss in mass of chippings as known as the 'Aggregate Abrasion Value' (AAV), and ranges from about 1 for hard flints to over 16 for aggregates normally considered too soft for use in road surfacing.

Features

  • Heavy duty mainframe on adjustable anti vibration pads . Steel lap wheel 610 mm diameter
  • Precision machined steel shaft and sealed bearings
  • Inverter drive to 3 phase motor for precise speed control
  • Totally enclosed, grease filled gear box
  • Scraper blades for sand removal
  • Predetermined revolution counter
  • 24 V DC control circuits for safety
  • Interlocked cabinet lid for safety
  • Sand Scoop to collect spendrift
  • CE approved

Applications

  • To determine the Aggregate Abrasion Value
 


Pendulum Skid

Introduction

The Cooper-Wessex skid resistance tester is one of the best portable skid resistance tester in the world. The Cooper-Wessex Pendulum Skid Tester CRT-PENDULUM is the high quality skid resistance testing equipment. Originally designed in the 1940s in the US, the instrument was further developed in the 1960s at the UK Transport Research Laboratory for the testing of road surfaces. The CRT-PENDULUM measures the frictional resistance between a rubber slider mounted on the end of a pendulum arm and the test surface. This provides highway engineers with a routine method of checking the resistance of wet and dry surfaces to slipping and skidding, both in the lab and on site. It is based on the Izod principle: a pendulum rotates about a spindle attached to a vertical pillar. At the end of the tubular arm a head of known mass is fitted with a rubber slider. The pendulum is released from a horizontal position so that it strikes the sample surface with a constant velocity. The distance travelled by the head after striking the sample is determined by the friction of the sample surface. A reading of Skid Resistance is obtained.

Features

  • Designed for laboratory and in situ road surface testing
  • Dispatched calibrated to EN1097-8 (accredited under ISO 9001:2000)
  • Low friction arm, and lightweight pointer
  • Comes with integral 'F' scale for use with small slider set for 76mm slide length. (PSV test)
  • Repeatable and reproducible
  • Supplied with robust carrying case
  • Made in the United Kingdom

Appliicatons

  • Assessment of surface friction and skid resistance properties
  • Testing of aggregates in the PSV (Polished Stone Value) test
  • Testing of new road surface materials under development
  • Testing of pedestrian walkways
  • Traffic accident investigations
  • Litigation investigations
  • Testing of pavers in the Flat Bed Polish.
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Polish Paver Machine

Introduction

The Cooper-Wessex Polish Paver Machine specifically designed to meet international standards for the determination of the Polished Paver Value PPV The Cooper-Wessex polish paver-value determination follows the BS812 aggregate abrasion method to polish the samples of pavers. The abrasion lap is modified by attaching standard a rubber disk. Corn emery and emery flour abrasives are fed to the samples under test as in the BS812 determination. The specimens are prepared to aggregate abrasion test specimen dimensions. Flat control specimens (of the same control stone as the PSV test) are also made to these dimensions. After completion of the polishing procedure the degree of polish is measured with the Pendulum skidresistance test in a similar way to the PSV test. A flat to curved correction factor is then applied to estimate the 'polished-paver value'; a correction being applied in the same way as the PSV test according to the level of the control specimens. The method has been published by the British Standards Institution a draft for development (DD 155). It also forms the basis of the draft European Standard.

Features

  • Heavy duty mainframe on adjustable anti-vibration pads . Steel lap wheel 610 mm diameter
  • Precision machined steel shaft and sealed bearings
  • Resilient mounted electric motor
  • Totally enclosed, grease filled gear box
  • Scraper blades for sand removal
  • Predetermined revolution counter

Applications

  • Determination of Polished Paver Value
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Large Hydraulic Four Point Bending Machine

Introduction

The only machine on the market to accept variable beam lengths. Bending tests are widely used for measuring the stiffness modulus and assessing the fatigue resistance of asphaltic paving materials. Four point bending tests are included in CEN, AASHTO and Chinese test specifications. The specimen is a prismatic beam which is subjected to sinusoidal loading in either the controlled strain or controlled stress modes. This equipment is capable of testing over a wider frequency range (up to 60 Hz) than can be achieved with pneumatic loading systems. The CRT-LH4PT-BB uses advanced servo-hydraulic technology and a high-speed digital data acquisition and control system together with user-friendly software. During testing both graphical and tabular data are displayed on screen and test data is stored to disc in Microsoft Excel compatible format. The test frame is housed in a temperature controlled cabinet with fan-assisted air circulation and a temperature range of -20 to 30°C. The unique constant torque clamping and three-transducer deflection measurement system of the CRT-LH4PT-BB can be configured to accept different beam sizes. This means that the ratio between beam dimensions and maximum aggregate size of test specimens will satisfy the requirements of the relevant European specifications.

Features

  • Frequency range 0.1 to 60Hz
  • High quality servo hydraulic four point bending machine . Double acting fatigue rated hydraulic actuator with integral stroke transducer
  • Utilises Star servo valve with 'Sapphire Technology'
  • Unique three transducer on-specimen deflection measurement system
  • Accepts various beam sizes: 380 to 660mm in length and 50 x 50mm to 100 x 100mm cross-section
  • Temperature controlled cabinet range -20 to 30°C . Sinusoidal controlled strain or controlled stress fatigue test modes
  • Constant torque motorized specimen clamping to eliminate errors due to localised beam indentation . User friendly software for determination of fatigue resistance and stiffness modulus
  • The possibility to make frequency/temperature sweeps . Supplied with certification of a UKAS accredited calibration
  • Covered for noise reduction

Applications

  • Mix design
  • End product specification
  • Assessment of new materials
 


Stand Alone Four Point Bending Beam Machine

Introduction

A low cost, accurate beam testing system which facilitates the rapid throughput of modulus and fatigue tests Bending tests are widely used for measuring the stiffness modulus and assessing the fatigue resistance of asphaltic paving materials. Four point bending tests are included in CEN, AASHTO and Chinese test specifications. The specimen is a prismatic beam which is subjected to sinusoidal loading in either the controlled strain or controlled stress modes. The CRT-SA4PT-BB uses advanced servo pneumatic technology and a high-speed digital data acquisition and control system together with user-friendly software. During testing both graphical and tabular data are displayed on screen and test data is stored to disc in Microsoft Excel compatible format. The clamps are at 118.5mm centres (the distance between the outer clamps is 335.6mm (14 inches) according to AASHTOspecifications but the height and width of the beam can be varied). Tests on beams containing aggregates greater than 20mm are not strictly in accordance with annex D of EN 12697-24 which states that this non-compliance should be explicitly mentioned in the test report.

Features

  • Frequency range 0.1 to 30Hz
  • Low cost pneumatic stand alone four point bending machine
  • Utilises a low-friction actuator and high performance ceramic spool servo-valve
  • On-specimen measurement system removes errors due to frame flexure . Accepts AASHTO beam sizes . Sinusoidal controlled strain or controlled stress fatigue test modes
  • Constant torque motorized specimen clamping to eliminate errors due to localised beam indentation
  • Self-contained loading system . User friendly software for determination of fatigue resistance and stiffness modulus . Supplied with certification of a UKAS accredited calibration

Applications

  • Mix design
  • End product specification
  • Assessment of new materials
 


Two Point Trapezoidal Bending Beam Machine

Introduction

Optimisation of the setting-up time with intelligent software, and accurate temperature control with an integrated temperature cabinet Bending tests are widely used for measuring the stiffness modulus and assessing the fatigue resistance of asphaltic paving materials. The two-point bending test on trapezoidal specimens is, arguably, the most repeatable and reproducible bending test method detailed in the relevant EN12697 standards. In this test the specimen is mounted as a vertical cantilever. The base is fixed and the top is moved sinusoidally with a constant displacement amplitude. The trapezoidal shape ensures that the maximum values of bending stress and strain occur away from the ends of the specimen where there are likely to be stress concentrations. With the Cooper Technology equipment, two trapezoidal specimens are tested simultaneously and stiffness modulus can be determined at a range of frequencies and temperatures. In the fatigue test the specimens are subjected to a constant strain amplitude at a selected frequency and temperature until the stiffness modulus decreases to a user-selected target level (normally 50 percent of its initial value).

Features

  • Rigid test frame housed within temperature cabinet
  • Temperature cabinet with fan assisted air circulation and glazed viewing door
  • Temperature cabinet range -20 to 30°C
  • Machine designed to test two specimens simultaneously
  • Frequency range from 0.1 to 30Hz
  • Precise manual setting of strain amplitude
  • Accurate pre-test displacement transducer adjustment using software feedback . Two high-precision +-2.5kN fatigue rated piezoelectric force transducers
  • High-speed control and acquisition system for interfacing to host computer . User-friendly software for fatigue and stiffness modulus tests
  • Software for automatically carrying out frequency sweeps . Supplied with certification of a UKAS accredited calibration

Appliicatons

  • Mixture design
  • End product specification
  • Assessment of new materials
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'Vialit Plate' Adhesion Tester: CRT-VPAT

Introduction

Easy to use, robust test apparatus to obtain consistent and repeatable results day after day. Complies with industry standards The Cooper Vialit Plate Adhesion Tester CRT-VPAT is used to evaluate binder aggregate adhesivity by vialit plate shock test method. This method is an indicator of aggregate retention for chippings. The adhesion between binder and chippings form the basis of successful surface dressing. Asphalt emulsion or hot binder is applied to stainless steel plates and aggregates are embedded in the binder using hand operational rubber wheel roller, which is fitted with bearings to ensure consistent, smooth rolling action. The prepared test plate is turned over and placed on 3 pointed support rods. Stainless steel ball is made to fall from an 'angled slide' three times within 10 seconds period onto the inverted test plates. The results are recorded as percent aggregate retention.

Features

  • Robust and high quality hardware
  • Fitted with inbuilt spirit level to allow easy alignment of base plate
  • Supplied with high quality stainless steel test plates
  • Stainless steel ball made according to European standard
  • Fitted with 'angled slide' with inclination of (3.0 +- 0.5)° for consistent ball launch
  • Easy to use, hand operational rubber roller fitted with bearings to ensure consistent, smooth rolling action
  • Can be supplied with traceable calibration certificate
  • Made in the United Kingdom

Applications

  • Determination of binder aggregate adehesivity
  • To design binder aggregate systems for surface dressing
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Cooper-Vialit Cohesion Pendulum : CRT-VCP

Introduction

The European Standards EN 13808 and EN 15322 demand this test according to EN 13588 as a basis for the CE marking of all polymer-modified binders for the intended use of surface treatment Vialit Cohesion Pendulum by Cooper CRT-VCP is a testing device to analyse the cohesion of bitumen in road construction. The cohesion is one of the measures of the performance of a bituminous binder. It is important to use binders which have a sufficient level of cohesion according to the level of traffic to be supported. Cohesion has originally been developed for surface dressing however it can be used for any type of binder (pure, modified or fluxed) which is to be used in different types of road applications. Knowledge of cohesion enables the choice of binder type for given traffic and site conditions.

Features

  • Automatic security safety catch avoiding pendulum to crash after test impact
  • Incremental angle sensor in combination with a digital display resolution of 0,1°
  • 36 cube and cube holder combinations, which allows an economic production of test samples (included)
  • Efficient safety system in compliance with EC - machinery directive 2006/42/EC which allows comfortable handling with maximum operational reliability
  • Module with built-in RS 232-port (allows the metering of test value via computer, retrofittable by user)
  • Software available for full automation of test

Applications

  • Bitumen
  • Bitumen emulsions
  • Flux bitumen
 


Slurry Testing Machine: CRT-STM (Wet Track Abrasion Test Machine)

Introduction

High quality, simple and reliable machine, complies to EN12774-5 for the determination of wearing and minimum binder content The slurry surfacing test machine CRT-STM also known as Wet Track Abrasion Test Machine was developed to simply and reliably determine the minimum binder content of the mix under wet track abrasion conditions according to the determination of wearing test: EN 12274-5.

Features

  • Abrasive head according to EN 12274-5
  • Planetary gear system providing the abrasive head with rotating speed of 144rpm for 61 complete cycles of the planetary system
  • Test bath fitted with three spindles to fix the test base plate
  • 310mm diameter and 5mm thick test base plate with 3 or 4 knurled head screw fasteners
  • Hose can be supplied made from 80° shore hardness rubber. The rubber is reinforced with double cord surface
  • The hose has an internal diameter 19mm and an external diameter of 31mm
  • Integral timing device stops the test automatically after 300 seconds
  • Type A,B,C and D Ring shaped annular metal moulds available

Applications

  • Determination of wearing
  • Determination of minimum binder content
 


Gyratory Compactor :CRT-GYR

Introduction

  • A high quality machine with which the user can easily and safely obtain accurate, repeatable results day after day
  • Gyratory compaction is considered to be one of the best methods of laboratory compaction for the assessment of compactibility and the manufacture of test specimens.
  • Compaction is achieved by the application of a vertical stress (normally 600KPa) via end platens to a known mass of asphaltic mixture within a 100 or 150mm internal φ mould. The longitudinal axis of the mould is rotated (gyrated) at a fixed angle to the vertical whilst the platens are kept parallel and horizontal.
  • During compaction the height of the sample is automatically measured and both the mixture density and void content calculated. The compaction data is shown on-screen in graphical and tabular format as compaction progresses and it is also saved in Microsoft Exce compatible format. The operator can choose whether to compact for a certain number of gyrations or until a target mixture density or void content is achieved.
  • Problems with existing compactors are mainly related to build quality and ease of use. Unlike most compactors 100 and 150mm φ moulds can be tested without changing machine parts. A filled gyratory compactor mould is heavy and often very hot. In many cases these moulds have to be lifted in and out of gyratory compactors. With the CRT-GYR no lifting of filled moulds is required. They are automatically lowered into position for compaction and then lifted up again for transfer to the integrated demoulding system.

Features

  • Complies with EN 12697-10 and EN 12697-31 . Can be configured to comply with SHRP Superpave specifications
  • Automatic mould insertion and retraction
  • 150mm and 100mm internal φ moulds can be tested without changing parts
  • Cold mix (emulsion) materials can be compacted and the expelled fluid collected
  • USB link with data acquisition and control system so that desktop can be used as host computer time
  • Compaction data stored in Microsoft Excel compatible format
  • Machine calibrated with traceable equipment
  • Option for mould up to 300mm high.

Appliicatons

  • Compaction of asphaltic paving material to a target mixture density or void content
  • Assessment of mixture compactibility . SHRP Superpave asphalt mixture design
  • Preparation of cylindrical test specimens
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Hydraulic Standard Roller Compactor Dual size :CRT-RC-H2

Introduction

Advanced integrated hydraulic control, precision and reliability guaranteed The Roller Compactor is considered to be the method of laboratory specimen compaction that results in slabs of asphaltic paving materials with properties that most closely simulate those of materials in the highway. Slabs can be compacted to target mixture densities using loads that are equivalent to those of full-scale compaction equipment. The CRT-RC-H2 is hydraulically powered and controlled by a programmable logic controller (PLC) connected to an HMI which the operator can use to select the number of passes. A manual pressure control is adjusted to set the required load. Its main function is to produce slabs for wheel tracking tests. Users have compacted hot asphaltic materials over stress absorbing membrane interlayers (SAMIs) on a base of cracked concrete in order to assess the effectiveness of the SAMI by using shear or bending tests.

Features

  • Steel wheeled roller segments
  • Solid machine frame
  • Optional heated head for reducing mixture sticking to roller during compaction
  • Model for compaction of 305 x 305mm and 305 x 400mm slabs . Slab depth from 40 to 135 mm
  • Roller compactor moulds will fit Cooper Technology Wheel trackers so that compacted slabs can be wheel-tracked without de-moulding
  • Maximum compaction load of 30kN per 305mm roll width (equivalent to largest on-site static rollers)
  • Speed control
  • HMI for operator selection of number of passes . Slabs can be used as wheel-tracking specimens, and cored to make indirect tensile test specimens or cut into beams for 4 Point Bending Test
  • Vibrating roller option with adjustable frequency to simulate on-site vibratory rollers
  • CE marked

Applications

Preparation of homogeneous asphalt slabs :
  • Wheel tracking tests
  • Coring to produce specimens for indirect tensile and axial tests
  • 4 Point Bending Test Beams
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European Standard Roller Compactors - Steel Roller: CRT-RC2S

Introduction

The most popular Roller compactor worldwide is robust, reliable and the industry standard The Roller Compactor is considered to be the method of laboratory specimen compaction that results in slabs of asphaltic paving materials with properties that most closely simulate those of materials in the highway. Slabs can be compacted to target mixture densities using loads that are equivalent to those of full-scale compaction equipment. The CRT-RC2S and CRT-RC2SV are pneumatically powered and controlled by a programmable logic controller (PLC) connected to an HMI which the operator can use to select the number of passes and compaction load levels. Although the primary function is to produce slabs for wheel tracking tests, the slabs can be sawn into beams or cored to provide specimens for a variety of other tests. Users have compacted hot asphaltic materials over stress absorbing membrane interlayers (SAMIs) on a base of cracked concrete in order to assess the effectiveness of the SAMI by using shear or bending tests.

Features

  • Steel wheeled roller segments
  • Solid machine frame
  • Model for compaction of 305 x 400mm and 305 x 305mm slabs
  • Roller compactor moulds will fit Cooper Technology Wheel trackers so that compacted slabs can be wheel-tracked without de-moulding
  • Maximum compaction load of 30kN per 305mm roll width (equivalent to largest on-site static rollers)
  • Speed control
  • HMI for operator selection of number of passes and compaction levels
  • Vibrating roller option with adjustable frequency to simulate on-site vibratory rollers
  • Safety enclosure with interlocked doors to prevent unguarded operation . Slabs can be used as wheel-tracking specimens, cored to make indirecttensile test specimens or sawn into beam fatigue specimens

Applications

Preparation of homogeneous asphalt slabs:
  • Wheel tracking tests
  • Sawing into beams for bending tests
  • Coring to produce specimens for indirect tensile and axial tests
 


Large Roller Compactor - Pneumatic Tyred: Roller CRT-RCENLD-III

Introduction

Optimisation of repeatability and productivity through the automation of human interface Roller compaction is the laboratory method that most closely simulates on-site compaction. The machine can be configured to operate with a single or twin wheels depending on the mould size. The wheels track the surface in overlapping wheel-paths using sequences specified in EN 12697-33 or custom sequences designed by the user. The base of the mould is incrementally raised by a precision jacking system and the system is tracked to keep it level with the top of the mould. Compacted slabs can be from 50 to 150mm thick. 500 x 180mm slabs are usually wheel tracked in the Cooper Technology Large Wheel Tracker, whilst 600 x 400mm slabs are normally cut to produce trapezoidal or prismatic specimens for fatigue, modulus tests and Duriez test.

Features

  • Compacts uniform slabs of asphaltic paving mixture . Computer control for repeatable standard EN 12697-33 compaction patterns
  • Option for customer defined compaction patterns to be programmed and saved
  • Single or dual wheeled configuration
  • Mould size (length x width) 500 x 180mm or 600 x 400mm
  • Compacted slabs can be used in the large pneumatic tyred wheel tracker or cut into beams for bending tests
  • Safety enclosure with optical laser sensors for user safety, easy access and excellent manoeuvrability . Issued with UKAS certification of calibration

Appliicatons

Preparation of homogeneous asphalt slabs:
  • Wheel tracking tests
  • Sawing into beams for bending tests
  • Coring to produce specimens for indirect tensile and axial tests
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Compression Testing Machine:CRT-CTM250-II

Introduction

High quality and versatile compression testing machine with certification of a UKAS accredited calibration The CRT-CTM250-II was developed to perform a variety of compressivestrength tests including Duriez, Indirect Tensile Strength and Marshall Stability. A rigid floor-standing test frame with bench-height working surface, twin columns and adjustable height cross-head houses a hydraulic cylinder with a load capacity of up to 300kN. The movement of the cylinder is controlled by custom software with feedback from either the stroke transducer or the load cell fixed to the cross-head. During testing, the machine operator is protected by a safety enclosure.

Features

  • Highly rigid test frame
  • Hydraulic loading under computer control
  • Pancake load cell (250kN capacity)
  • Innovative quick-release Duriez mould system
  • Three position adjustable cross-head height
  • Large bench-height working surface . Can be configured for tensile tests if required
  • Includes PC preloaded with test software
  • Interlocked safety enclosure with clear polycarbonate door . Supplied with certification of a UKAS accredited calibration

Applications

Preparation of homogeneous asphalt slabs :
  • Duriez assessment of moisture susceptibility . Measurement of Tensile Strength in indirect tensile mode
  • Measurement of Marshall Stability and Flow
  • Various strength tests
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Electric Laboratory Core Drill Stand : CRT-LABDRIL-E/H

Introduction

To carry out any form of testing requires straight & clean sided core samples. Vibration of a diamond core drill during the coring process will result in a badly finished core that will need to be 'dressed' before any meaningful testing can be carried out. In addition vibration of a core drill will also quickly damage the diamond cutting face by erosion of the individual diamonds resulting in rapid wear rates. Coring should always be carried out using a rigid, stable &vibration free operating platforms to ensure the integrity of core samples. The drill stand is a steel framed unit manufactured in mild steel with a high quality powder coated and oven baked paint finish giving a quality appearance and long lasting protection. Its rigid drill platform can be permanently fastened to the floor and is therefore ideally suited for use in a test environment. It can drill cores from a sample of asphalt or concrete material held by a clamp mechanism situated within the water tank. The drill stand is complete with a water swivel that allows connection to a water supply thus providing a coolant to the drill bit face. Manually operating the drill feed into the surface with a constant applied load achieves optimum feed rate and maximum drill life. During the coring process water is pumped through the core bit to provide cooling at the drill face and to flush away any loose material. The rubber lined water tank allows for collection and drainage of the cooling water. Hydraulic operation allows the drill motor to rotate at the optimum speed for the particular surface material. Manually operating the drill feed into the surface with a constant applied load achieves optimum feed rate and maximum drill life. The unit can be supplied with a hydraulic drill motor CRT-LABDRIL-H or an electric drill motor CRTLABDRIL- E to suit. The manually operated drill feed control provides for a rapid but safe drill penetration with minimum core bit wear rate.

Features

  • Petrol engine 5.2KW hydraulic version, 2KW Electrical version
  • Rigid floor fixing and water swivel that ensures flow of coolant to drill tips
  • Drill diameters up to 110 mm (4.3 inch)
  • Drill depths up to 500 mm (19.6 inch)
  • Wide variety of hydraulic or electrical drill motor options
  • Electrically pumped water feed is available when using a hydraulic drill motor
  • All units supplied with water swivel
  • Platform allows for rigid floor mounting

Applications

  • Medium duty coring in both asphalt, concrete or rock samples
  • Ideal for drilling test cores in a laboratory environment from small samples
 


Heavy Duty Core Drilling Trailers:CRT-HCT

Introduction

Hydraulic proportional drill feed mechanism 'automatically' ensures the fastest drill feed at optimum cutting speed.
CRT-HCT Heavy Duty Coring Trailers:

  • Option 1 - Honda 17.5HP Petrol engine P15-400
  • Option 2 - Lister 17.5HP Diesel engine D-15-400
  • Option 3 - Lister 27HP Diesel engine D20-600
To carry out any form of testing requires straight &clean sided core samples. Vibration of a diamond core drill during the coring process will result in a badly finished core that will need to be 'dressed' before any meaningful testing can be carried out. In addition, vibration of a core drill will also quickly damage the diamond cutting face by erosion of the individual diamonds resulting in rapid wear rates. Coring should always be carried out using a rigid, stable &vibration free operating platforms to ensure the integrity of core samples. Cooper Heavy Duty Core Drilling Trailers CRT-HCT are self contained coring machines that provide a rigid and stable drill platform for all types of coring in a wide variety of asphalt &concrete surfaces. The proportional hydraulic feed system provides for a rapid but safe drill penetration with minimum core bit wear rate.

Features

  • 10 hours of normal working is possible with the 27 litres (7 gal) fuel tank &400 (105.6 gal) litre water tank
  • Drill depths of 600 mm (23.62 inch) or 1000 mm (39.3 inch) as standard with extension bars for deeper drilling
  • Proportional' feed system allows fast &safe coring even through steel re-inforcement bars
  • 'Automatic' Soft Start Drilling feature ideal for in-experienced operators
  • 'Two-function' Emergency Stop prevents any run-on of the drill whilst the engine is stopping
  • Power take-off facility for driving a hydraulic road breaker or hydraulic tamper
  • 103 dB Maximum noise level

Applications

  • Medium duty coring in both asphalt &concrete surface
  • Heavy duty coring in both asphalt &concrete surfaces
  • Ideal for taking regular test samples in road surfaces or airfield runways
  • Ideal for drilling large numbers of holes to precise standards
 


Hydraulic Laboratory Core Drill Stand : CRT-LABDRIL-E/H

Introduction

To carry out any form of testing requires straight & clean sided core samples. Vibration of a diamond core drill during the coring process will result in a badly finished core that will need to be 'dressed' before any meaningful testing can be carried out. In addition vibration of a core drill will also quickly damage the diamond cutting face by erosion of the individual diamonds resulting in rapid wear rates. Coring should always be carried out using a rigid, stable &vibration free operating platforms to ensure the integrity of core samples. The drill stand is a steel framed unit manufactured in mild steel with a high quality powder coated and oven baked paint finish giving a quality appearance and long lasting protection. Its rigid drill platform can be permanently fastened to the floor and is therefore ideally suited for use in a test environment. It can drill cores from a sample of asphalt or concrete material held by a clamp mechanism situated within the water tank. The drill stand is complete with a water swivel that allows connection to a water supply thus providing a coolant to the drill bit face. Manually operating the drill feed into the surface with a constant applied load achieves optimum feed rate and maximum drill life. During the coring process water is pumped through the core bit to provide cooling at the drill face and to flush away any loose material. The rubber lined water tank allows for collection and drainage of the cooling water. Hydraulic operation allows the drill motor to rotate at the optimum speed for the particular surface material. Manually operating the drill feed into the surface with a constant applied load achieves optimum feed rate and maximum drill life. The unit can be supplied with a hydraulic drill motor CRT-LABDRIL-H or an electric drill motor CRTLABDRIL- E to suit. The manually operated drill feed control provides for a rapid but safe drill penetration with minimum core bit wear rate.

Features

  • Petrol engine 5.2KW hydraulic version, 2KW Electrical version
  • Rigid floor fixing and water swivel that ensures flow of coolant to drill tips
  • Drill diameters up to 110 mm (4.3 inch)
  • Drill depths up to 500 mm (19.6 inch)
  • Wide variety of hydraulic or electrical drill motor options
  • Electrically pumped water feed is available when using a hydraulic drill motor
  • All units supplied with water swivel
  • Platform allows for rigid floor mounting

Applications

  • Medium duty coring in both asphalt, concrete or rock samples
  • Ideal for drilling test cores in a laboratory environment from small samples
 


Medium Duty Core Drilling Trailers:CRT-MCT

Introduction

Single or two-speed infinitely variable hydraulic drill motors available with wide choice of sizes to suit the particular application. Hydraulic drive always provides the best control and results in clean straight core samples CRT-MCT Medium Duty Coring Trailers: Option 1 - Honda 9.5 kW (12.7HP) Petrol engine P12-400 Option 2 - Hatz 7.5kW (10HP) Diesel engine D10-250 To carry out any form of testing requires straight &clean sided core samples. Vibration of a diamond core drill during the coring process will result in a badly finished core that will need to be 'dressed' before any meaningful testing can be carried out. In addition, vibration of a core drill will also quickly damage the diamond cutting face by erosion of the individual diamonds resulting in rapid wear rates. Coring should always be carried out using a rigid, stable &vibration free operating platforms to ensure the integrity of core samples. CRT-MCT Medium Duty Core Drilling Trailers are self contained and provide a rigid and stable drill platform for all types of coring in a wide variety of asphalt &concrete surfaces. The manually operated drill feed control provides for a rapid but safe drill penetration with minimum core bit wear rate.

Features

  • 4 to 5 hours of normal working is possible with 10 litre fuel tank &200 litre water tank
  • Drill diameters up to 400 mm
  • Drill depths of up to 650mm as standard with extension kits for deeper drilling
  • Hand fed drill allows for safe coring even through steel re-inforcement bars
  • 103 dB maximum noise level
  • Power take-off facility for driving a hydraulic road breaker or hydraulic tamper

Applications

  • Medium code drilling in both asphalt and concrete surfaces. Ideal for taking occasional test samples in road surfaces or air field runways
  • One man operation keeps costs to a minimum
 


One Man On Site Core Drilling Machine:CRT-SCM

Introduction

This fixing free core drill stand is your solution to core drill 60 holes within 2 hours with only one man operation &will fit into a small van or even an estate car Cooper One-Man on site coring machine CRT-SCM is self contained and provides a rigid and stable drill platform for all types of coring in a wide variety of asphalt & concrete surfaces for medium duty. To carry out any form of testing requires straight &clean sided core samples. Vibration of a diamond core drill during the coring process will result in a badly finished core that will need to be 'dressed' before any meaningful testing can be carried out. In addition vibration of a core drill will also quickly damage the diamond cutting face by erosion of the individual diamonds resulting in rapid wear rates. Coring should always be carried out using a rigid, stable &vibration free operating platforms to ensure the integrity of core samples. Cooper One-Man Coring Machines CRT-SCM are self contained and provide a rigid and stable drill platform for all types of coring in a wide variety of asphalt &concrete surfaces. The manually operated drill feed control provides for a rapid but safe drill penetration with minimum core bit wear rate.

Features

  • Petrol engine 5.0KW
  • Drill diameters up to 200 mm
  • Drill depths up to 450 mm
  • Hand fed drill feed allows for safe coring even through steel re-inforcement bars
  • Wide variety of drill motor options
  • Fits into a small commercial van or medium size estate car
  • Water capacity 25 litres
  • Platform is operator stabilized
  • Power take-off facility for driving a hydraulic road breaker or hydraulic tamper
  • Conforms to AASHTO T 24

Appliicatons

  • Medium code drilling in both asphalt and concrete surfaces. Ideal for taking occasional test samples in road surfaces or air field runways
  • One man operation keeps costs to a minimum
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Thermo-regulated Floor Standing Mixers: CRT-MIXER30/60/100

Introduction

This fixing free core drill stand is your solution to core drill 60 holes within 2 hours with only one man operation &will fit into a small van or even an estate car Cooper One-Man on site coring machine CRT-SCM is self contained and provides a rigid and stable drill platform for all types of coring in a wide variety of asphalt & concrete surfaces for medium duty. To carry out any form of testing requires straight &clean sided core samples. Vibration of a diamond core drill during the coring process will result in a badly finished core that will need to be 'dressed' before any meaningful testing can be carried out. In addition vibration of a core drill will also quickly damage the diamond cutting face by erosion of the individual diamonds resulting in rapid wear rates. Coring should always be carried out using a rigid, stable &vibration free operating platforms to ensure the integrity of core samples. Cooper One-Man Coring Machines CRT-SCM are self contained and provide a rigid and stable drill platform for all types of coring in a wide variety of asphalt &concrete surfaces. The manually operated drill feed control provides for a rapid but safe drill penetration with minimum core bit wear rate.

Features

  • Discharge via outlet into a secure Safety Guarded area below
  • Pivoting slide valve empties into 20 litre trays
  • Full stainless steel-corrosion resistance
  • Inverter control blade speed adjustment
  • Mix temperature monitoring via trough thermocouple
  • Compact, space saving design takes up less floor space
  • Simulates full scale mixing
  • Minimises segregation
  • CE marked and UK made

Appliicatons

  • Mixing bituminous materials
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Core and Beam Saws:CRT-SAW-100

Introduction

Easy-to-use, fast and accurate sawing systems. Best in class, safety features Cooper Technology has developed easy-to-use sawing systems for fast, accurate cutting of beams for asphalt prisms (prepared in Cooper Technology's Roller Compactors - small and large models) to be used for Four Point Bending Beam Testing in CRT-SA4PT-BB and CRT-LH4PT-BB, for Two Point Bending Beam testing in CRT-2PT, and cutting &dressing round cores and large &small wheel tracked slabs.

Features

  • Suitable for natural and artifical slabs, asphalt, concrete, tile, marble, granite
  • Four point beam testing jigs supplied as standards
  • Variable speed and electromotive feed available as options
  • CE marked

Applications

  • Cutting of prisms to be used in Four Point Beam Bending testing according to EN123697-24/26 and AASHTO T321
  • Cutting of trapezoidal specimens to be used in Two Point Beam Bending testing according to EN12697-24/26
  • Cutting and dressing of round cores up to 200mm depending on model
  • Cutting and dressing of wheel tracking slabs
 


Core and Beam Saws:CRT-SAW-150

Introduction

Easy-to-use, fast and accurate sawing systems. Best in class, safety features Cooper Technology has developed easy-to-use sawing systems for fast, accurate cutting of beams for asphalt prisms (prepared in Cooper Technology's Roller Compactors - small and large models) to be used for Four Point Bending Beam Testing in CRT-SA4PT-BB and CRT-LH4PT-BB, for Two Point Bending Beam testing in CRT-2PT, and cutting &dressing round cores and large &small wheel tracked slabs.

Features

  • Suitable for natural and artifical slabs, asphalt, concrete, tile, marble, granite
  • Four point beam testing jigs supplied as standards
  • Variable speed and electromotive feed available as options
  • CE marked

Applications

  • Cutting of prisms to be used in Four Point Beam Bending testing according to EN123697-24/26 and AASHTO T321
  • Cutting of trapezoidal specimens to be used in Two Point Beam Bending testing according to EN12697-24/26
  • Cutting and dressing of round cores up to 200mm depending on model
  • Cutting and dressing of wheel tracking slabs
 


Core and Beam Saws:CRT-SAW-100/150/200

Introduction

Easy-to-use, fast and accurate sawing systems. Best in class, safety features Cooper Technology has developed easy-to-use sawing systems for fast, accurate cutting of beams for asphalt prisms (prepared in Cooper Technology's Roller Compactors - small and large models) to be used for Four Point Bending Beam Testing in CRT-SA4PT-BB and CRT-LH4PT-BB, for Two Point Bending Beam testing in CRT-2PT, and cutting &dressing round cores and large &small wheel tracked slabs.

Features

  • Suitable for natural and artifical slabs, asphalt, concrete, tile, marble, granite
  • Four point beam testing jigs supplied as standards
  • Variable speed and electromotive feed available as options
  • CE marked

Applications

  • Cutting of prisms to be used in Four Point Beam Bending testing according to EN123697-24/26 and AASHTO T321
  • Cutting of trapezoidal specimens to be used in Two Point Beam Bending testing according to EN12697-24/26
  • Cutting and dressing of round cores up to 200mm depending on model
  • Cutting and dressing of wheel tracking slabs
 


Asphalt Pavement Thermal Testing System (TSRST)

Introduction

Optimise Low Temperature Performance of Asphaltic Concrete Mixtures. Complies with AASHTO TP10 and prEN 12697-46 The Thermal Stress Restrained Specimen Test (TSRST) is used to determine the low temperature cracking susceptibility of asphalt concrete. In the early 1990s the TSRST was developed by OEM with Oregon State University (OSU) as part of the Strategic Highway Research Program. The test method became AASHTO TP10. The TSRST test has also been included as one of the tests within EN12697-46. OEM-Cooper have developed the TSRST device to perform tests included in this standard. Now as a multipurpose low temperature testing machine the TSRST has been renamed the Asphalt Pavement Thermal Testing System (APTTS). With over 20 years of experience, and as the original developers of the TSRST OEM-Cooper are the recognized word experts in the field.

Features

  • Cool or heat an asphaltic concrete specimen at a constant rate or hold a constant temperature
  • Simulate actual field conditions with user programmable temperature profiles
  • Perform cyclic temperature testing
  • Minimises radial and/or transverse forces with dual clevis and rod end assemblies

Applications

  • Determines the failure characteristics of Asphaltic Concrete (AC) specimens when cooled below freezing according to a user defined temperature profile
  • Evaluates low temperature performance of field cores from existing roads
  • Test laboratory compacted cores of new or experimental mixes
  • Demonstrates the effects on low temperature performance of modified binders and from adding modified to standard binders
 


Precision Unbound Material Analyser:CRT-PUMA

Introduction

Innovative test equipment which fills the gap between complex laboratory tests and CBR The Precision Unbound Material Analyser (PUMA) is a new type of laboratory test equipment designed to fill the gap between expensive and complex laboratory tools (such as triaxial cells) and more empirical methods (such as the California Bearing Ratio test). It is designed to generate realistic values of modulus for use in road pavement design. The PUMA can be used to test unbound, hydraulically bound and asphaltic materials. It has been designed as a low cost, easy to use and practical tool, but one which is capable of generating scientifically meaningful data (Modulus and Resistance to Permanent Deformation), for use in road pavement design. It can be used to test specimens made from granular material, soil or lightly stabilised material etc, with a maximum particle size of 31.5mm. The PUMA is proposed as a direct equivalent to the Springbox, with the advantage that initial stress conditions can be accurately controlled. It is a simple test, suited to generic specification, that holds the promise of increased confidence in pavement foundation design, particularly in cases where favourable weather conditions during construction result in unrepresentatively high Dynamic Plate Test (DPT) values, or in cases where stabilised soils or cold-mix asphalt are employed.

Features

  • Designed for use within a UTM loading frame
  • Compatible with existing loading systems currently used for asphalt testing
  • Compaction can be carried out using existing vibrating hammer equipment
  • Flexibility to alter stress conditions (vertical and horizontal)and the number of load cycles if desired
  • Possibility to carry out the test directly under DPT equipment in order to simulate as closely as possible the likely in-situ value
  • Equipment is applicable to all unbound materials with particle size up to 31.5mm
  • Suitable for tests on hydraulically bound materials

Appliicatons

  • Determination of stiffness modulus under different stress conditions, allowing pavement design to be more scientifically based than is possible when relying on an assumed relationship to an in-situ DPT value
  • Measurement of rate of increase of permanent deformation, which can be directly related to design against rutting, applicable to relatively thinly surfaced roads
  • Tests cold mix asphalt
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Servo-Pneumatic Universal Testing Machine:CRT-UTM-NU

Introduction

Rapid determination of modulus, permanent deformation andfatigue of bituminous mixtures using cylindrical specimens that are cored from the highway or prepared in the laboratory This machine is a development of the NAT which was developed by Keith Cooper and Professor Steven Brown at the University of Nottingham. The use of a high precision servo-pneumatic valve in conjunction with a low-friction actuator and sophisticated data acquisition and control, results in a performance that is equal to many servo-hydraulic systems. Accurate, digitally generated waveforms are applied by the actuator producing repeatable stress variations in test specimens that are simulative of those in a road pavement due to moving traffic. The actuator is double-acting allowing both compressive and tensile forces to be applied. A triaxial cell system is available for the measurement of the resilient modulus of unbound materials.

Features

  • Low cost dynamic loading universal test system ideally suited to testing asphalt and unbound granular materials
  • Double acting low friction actuator with integral stroke transducer
  • Utilises high performance ceramic spool servo-valve
  • High quality stainless steel frame . Issued with UKAS accredited certificate of calibration for EN 12697-24; EN12697-25, EN 12697-26
  • Accessories available to perform a range of standard and non standard test methods . Can be supplied with standard software to perform EN, ASTM andAASHTO test methods and universal software with which to design non standard test routines

Applications

Preparation of homogeneous asphalt slabs :
  • Assessment of resistance to permanent deformation (rutting)
  • Measurement of stiffness modulus . Assessment of resistance to fatigue cracking
  • Resilient modulus of unbound materials
  • Mix design
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Servo-Hydraulic Universal Testing Machine:CRT-UTM-HYD

Introduction

A new generation of Universal Testing Machine combining state of the art technology with proven reliability and precision for research and standard testing The Servo-Hydraulic Universal Testing Machine (CRT-UTM-HYD) is a well designed, inexpensive machine specifically developed for the testing of materials used in pavement construction. A motorized, adjustable crosshead reduces the time between test setups. The programmable temperature cabinet provides the possibility to perform frequency/temperature sweeps. Accurate waveforms are digitally generated and applied by the actuator producing repeatable conditions that are simulative of those created by moving or static vehicles. The actuator is double-acting allowing both compressive and tensile forces to be applied. Various systems are available for the measurement of the modulus of unbound materials.

Features

  • Designed to perform a range of tests on asphaltic paving materials, sub-grade soils and granular sub-base materials . Double acting fatigue rated hydraulic actuator with integral stroke transducer
  • Utilises Star servo valve with 'Sapphire Technology'
  • Motorised adjustable lower crosshead with automatic hydraulic frame clamping
  • Integral programmable temperature controlled cabinet . Issued with UKAS accredited certificate of calibration for EN 12697-24; EN12697-25, EN 12697-26
  • Accessories available to perform a range of standard and non standard test methods . Can be supplied with standard software to perform EN, ASTM andAASHTO test methods and universal software with which to design non standard test routines

Applications

Preparation of homogeneous asphalt slabs:
  • Assessment of resistance to permanent deformation (rutting)
  • Measurement of stiffness modulus . Assessment of resistance to fatigue cracking
  • Resilient modulus of unbound materials
  • Mix design
 


Auto Lift Arm ECO Wheel Tracker:CRT-WTECO-A

Introduction

The Auto Lift Arm ECO Wheel Tracker saves energy, is space efficient and can double daily testing output Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. A loaded wheel tracks a sample under specified conditions of load, speed and temperature while the development of the rut is monitored continuously during the test. Test specimens can be either slabs prepared with a laboratory compactor or 200mm φ cores cut from the highway. The CRT-WTECO-A wheel tracker performs both procedures A and B specified for the small scale device in EN 12697-22. Procedure A requires that six specimens are tested. For procedure B only two specimens need to be tested, but rut depth must be measured at more points along the longitudinal rut profile and the tests are longer. To speed up the testing process the CRT-WTECO-A was designed to test two specimens within one working day via a pre-programmable unique lift arm mechanism (European Community registered design #:001699042).

Features

  • . Tests materials for roads with axle loads up to 13 tonnes
  • Fully programmable automated lift arm, enables up to twice the normal test throughput
  • Automated pre programmable sample conditioning
  • Small and compact for maximum energy efficiency, 28% saving over CRT-WTEN1
  • Integral temperature controlled cabinet with fully glazed doors . PID control of test temperature in the range 40°C to 62°C
  • Specimens compacted with the Cooper Technology Roller Compactor can be transferred directly to the wheel tracker without de-moulding
  • User-friendly Windows software . Supplied with UKAS accredited calibration certification
  • CE marked

Appliicatons

Preparation of homogeneous asphalt slabs:
  • Wheel tracking tests
  • Sawing into beams for bending tests
  • Coring to produce specimens for indirect tensile and axial tests
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Hamburg (Immersion) Wheel Tracker:CRT-WTIM

Introduction

The only truly sinusoidal Hamburg wheel tracker on the market. Another representation of Cooper quality and attention to detail The Hamburg type dual arm immersion wheel tracker is widely used to evaluate the resistance to rutting and moisture susceptibility of asphalt mixtures following either EN12697-22 or AASHTO-T324. The device was developed in the 1970's by Esso A.G. of Hamburg, Germany. It was based on the TRL wheel tracker which is also now included in EN12697-22. Originally the Hamburg test was used by the City of Hamburg to measure rutting susceptibility. The test was performed for 9,540 wheel passes at either 40 or 50°C. Water was used to obtain the required test temperature rather than air. The City of Hamburg later increased the number of wheel passes to 19,200 and found that some mixtures began to deteriorate from moisture damage. Greater than 10,000 wheel passes was generally needed to show the effects of moisture damage. Specimens can be prepared in the laboratory, or cores taken from the road can be used. Loaded steel or rubber wheels track a sample under regulated load, speed and temperature, whilst the development of the rut is constantly monitored and recorded throughout the test.

Features

  • Able to perform AASHTO-T324 and EN 12697-22
  • State of the art software which provides higher level users with options, and lab technicians ease of use
  • Advanced machine with 4 testing modes: Wet, wet heat, Dry and Dry heat (with optional heating hood)
  • A mechanical re-circulating water bath controls the temperature to within +- 0.5°C in a range of (20-75) °C
  • Variable speed range between 15 and 30RPM . Two displacement transducers attached to the wheel support arms measure the depth of the ruts as they develop with a resolution of 0.01mm to a maximum rut depth of 50mm
  • The depth of the rut is measured automatically and constantly as specified in the AASHTO and EN standards
  • Rubber or stainless steel wheels, and various widths to alter the applied pressure . Various mould options including laboratory compacted and cores (AASHTO and EN) . UKAS Certificate supplied
  • Cooper is the world number one wheel tracker manufacturer

Applications

Preparation of homogeneous asphalt slabs :
  • Investigation of resistance to rutting
  • Investigation of moisture susceptibility
  • Testing of laboratory compacted slabs
  • Testing of field cores
  • Production of creep slope, stripping inflection point and stripping slope
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Wheel Tracker Large Device:CRT-WTENLD

Introduction

Optimisation of the wheel tracking test time and result accuracy through computerised control Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. In this machine, two 500x180mm specimens are tested simultaneously by tracking with wheels fitted with pneumatic tyres under specified conditions of load, speed and temperature while the development of the rut profile is monitored at specified intervals during the test. The moulded specimens are inserted and removed from the wheel tracker using an Easy-load system. The Wheel Tracker Large Device CRT-WTENLD supersedes the French Pavement Rutting Tester by using a unique instrumented measurement device, linked to the data acquisition, to measure the development of rutting during testing. It allows extreme efficiency compared to any other type of devices of its type. The test procedure and conditions are controlled and data acquired using Windows software running on a host computer via a high speed digital interface and signal conditioning system.

Features

  • Tests materials for roads with axle loads of at least 13 tonnes
  • Unique rut profile measurement device linked to data acquisition system
  • Integral temperature controlled cabinet
  • Test temperature range 40 to 60°C
  • Tests for specified number of cycles or to specified rut depth
  • Double glazed doors for viewing test
  • Easy-load system for specimen handling
  • Conditioning of specimens at test temperature
  • User friendly Windows software
  • Automatic test start/stop
  • Closed loop speed control
  • Specimens can be compacted in the CRT-RCENLD-II and then wheel tracked without demoulding
  • Supplied with certification of a UKAS accredited calibration

Applications

  • Determination of the rut resistance of asphaltic paving materials
 


Wheel Tracker Small Devices - 1 Arms:CRT-WTEN1/AUS

Introduction

The CRT-WTEN1 and CRT-WTEN2 are supplied with a UKAScertificate of accreditation validating conformance to EN13108 Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. A loaded wheel tracks a sample under specified conditions of load, speed and temperature while the development of the rut is monitored continuously during the test. Test specimens can be either slabs prepared with a laboratory compactor or 200mm φ cores cut from the highway. The CRT-WTEN1 wheel tracker performs both procedures A and B specified for the small scale device in EN 12697-22. Procedure A requires that six specimens are tested. For procedure B only two specimens need to be tested, but rut depth must be measured at more points along the longitudinal rut profile. To speed up the testing process the CRT-WTEN2 was designed to test two specimens simultaneously.

Features

  • Tests materials for roads with axle loads up to 13 tonnes
  • Rigid test frame built from extruded aluminium section
  • Integral temperature controlled cabinet with double glazed doors
  • PID control of test temperature in the range 40°C to 62°C
  • Rack for pre-test temperature conditioning of specimens
  • The CRT-WTEN2 tests two specimens simultaneously
  • Specimens compacted with the Cooper Technology Roller
  • Compactor can be transferred directly to the wheel tracker without de-moulding
  • Closed-loop speed control
  • User-friendly Windows software . Supplied with certification of a UKAS accredited calibration

Applications

  • Determination of the rut resistance of asphaltic paving material
 


Wheel Tracker Small Devices - 2 Arms:CRT-WTEN2/AUS

Introduction

The CRT-WTEN1 and CRT-WTEN2 are supplied with a UKAScertificate of accreditation validating conformance to EN13108 Wheel tracking is used to assess the resistance to rutting of asphaltic materials under conditions which simulate the effect of traffic. A loaded wheel tracks a sample under specified conditions of load, speed and temperature while the development of the rut is monitored continuously during the test. Test specimens can be either slabs prepared with a laboratory compactor or 200mm φ cores cut from the highway. The CRT-WTEN1 wheel tracker performs both procedures A and B specified for the small scale device in EN 12697-22. Procedure A requires that six specimens are tested. For procedure B only two specimens need to be tested, but rut depth must be measured at more points along the longitudinal rut profile. To speed up the testing process the CRT-WTEN2 was designed to test two specimens simultaneously.

Features

  • Tests materials for roads with axle loads up to 13 tonnes
  • Rigid test frame built from extruded aluminium section
  • Integral temperature controlled cabinet with double glazed doors
  • PID control of test temperature in the range 40°C to 62°C
  • Rack for pre-test temperature conditioning of specimens
  • The CRT-WTEN2 tests two specimens simultaneously
  • Specimens compacted with the Cooper Technology Roller
  • Compactor can be transferred directly to the wheel tracker without de-moulding
  • Closed-loop speed control
  • User-friendly Windows software . Supplied with certification of a UKAS accredited calibration

Applications

  • Determination of the rut resistance of asphaltic paving material