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The Pavetest Overlay Tester is a servo-pneumatic controlled testing machine utilizing digital control of a high performance servo valve to provide accurate loading wave shapes up to 60Hz, specifically designed to determine the susceptibility of asphalt mixtures to cracking according to Texas DOT test procedure Tex-248-F and proposed ASTM Standard WK 26816.
The machine applies cyclic loading to a specimen that is cut from a 150 mm diameter sample into the shape of a rounded end beam. The system comprises a load frame, with one fixed and one moving plate, temperature control system, Control and Data Acquisition System (CDAS) and optional silent air compressor. The specimen is glued to two plates and this assembly is placed in the machine for testing. This is intended to simulate the action of movement under an asphalt overlay to assess how failure might occur in the field due to factors such as thermal expansion / contraction and reflective cracking.
The Pavetest Overlay Tester is underpinned by Pavetest’s leading edge CDAS digital controller, TestLab software and all the necessary accessories, hardware and software in perfect unison.


- Compact, fully self contained, precision engineered unit
- Thermoelectric (TE) Heating/Cooling - More reliable and envronmentally friendly than mechanical refrigeration & heating elements
- Optional silent air compressor with associated air preparation equipment
- Built in verification (Dial gauge)
- Integral stand with wheels
- Specimen preparation kit
- Additional specimen plates

- Load Capacity: Up to 16 kN (Static)
- Actuator stroke: 10 mm
- Temperature range: 10 to 60°C
- Power supply: 120 V 60 Hz or 230 V 50 Hz
- Noise Level: Less than 70 db at 2 m
- Dimensions: 980 (h) x 440 (d) x 1020 (w) mm

CDAS Digital Controller:
Pavetest’s compact Control and Data Acquisition System (CDAS) delivers unparalleled performance, real time control and ultimate versatility in acquisition. The CDAS provides excellent waveform fidelity from integrated acquisition and control functions, with low level sampling at speeds of up to 192,000 samples per second simultaneously on all channels (using up to 64x oversampling) gives superior low noise performance and resolution of 20 bit over the full dynamic input signal range (no auto ranging required).

TestLab Software:
Developed with ultimate flexibility in mind, TestLab test and control software caters to all levels of operator experience. By use of preprogrammed “Method files”, an inexperienced operator can run a range of international test methods without the need for any programming.
Moreover, a test “Wizard”, available with popular tests can guide the operator step by step based on a “recipe book” approach. Most importantly, the experienced engineer and/or researcher need not be constrained by the functions and analysis in the method files provided. The operator may, clone, modify and/or generate his/her own method file to suit their specific requirements. The Excel based data analysis offers the operator the flexibility to implement alternative analysis and customized reporting facilities.
TestLab allows for real time graphing of results and configurable real time transducer levels display with unprecedented clarity of results and analytical power.