Texas Overlay Tester

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Designed according to the proposed ASTM

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Dedicated no compromise Texas Overlay machine

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Integrated surface mounted touch screen control (Touch+)

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Intelligently designed specimen gluing & ‘zero stress’ carrying frame

State-of-the-art equipment

State-of-the-art test equipment for determining the crack initiation and crack propagation experienced within asphalt mixtures

In recent years many mixture design methods have produced materials that are stiffer, leaner and more resistant to rutting, however, such materials are often more susceptible to fatigue and reflection cracking. The Texas Overlay Tester was designed to simulate the expansion and contraction movements that occur in the vicinity of joints or cracks and which result in reflection cracking in overlays. With the Cox/Cooper Texas Overlay Tester it is possible to characterize both the crack initiation and crack propagation properties of asphalt mixtures. Cox/Cooper have developed the Texas Overlay Tester, which is a dedicated, state-of-the-art piece of equipment for carrying out this test. 

Automatically calculates critical fracture energy and crack resistance index according to Tex-248-F. 

Texas Overlay Tester includes: 

  • CRT-TOT-PL Pair of Platens with pins for Texas Overlay 
  • CRT-TOT-ZS – “Zero Stress” carrying frame to align the two base plates and fix the specimen prior to testing with specimen alignment 
  • CRT-TOT-CT – Cutting Template 
  • CRT-TOT-2EPOX – Two-part epoxy with minimum 24 hour tensile strength of 4.1MPa and 24hr shear strength of 13.8MPa in accordance with Tex-614-J (DevconTM two ton 30-Minute Plastic Steel Epoxy Cement) 
  • CRT-TOT-SBAR – 2mm x 4.2mm spacer bar for plate separation and alignment 
  • CRT-TOT-2.25WEIGHT 2.25 kg (5 lb) weight (in the shape of the specimen to ensure load is spread evenly and does not overhang the edges of the specimen) 
  • CRT-TOT-TAPE – ¼ inch width adhesive tape 
  • CRT-TOT-MARKER – Permanent marker 
  • CRT-TOT-GRA – Glue removing agent 
  • CRT-TOT-GLUE – Gluing jig 

Highly advanced and accurate test equipment for the determination of crack initiation and crack propagation in asphalt mixtures

Month Warranty

  • Accuracy of Test Results 100% 100%
  • After-Sale Customer Satisfaction 97% 97%
  • Dedicated no compromise Texas Overlay machine 
  • Integral surface-mounted, touch-screen control 
  • Intelligently designed specimen gluing and “zero stress” carrying frame 
  • Fitted with high performance hydraulic actuator and power-pack 
  • Ergonomically designed for easy operation 

Maximum force

4946lbf (22kN)

Load transducer

5000lbs (22.2kN)

Maximum dis­placement

0.2″ (5.1mm)

Temperature range

23 to 104°F (-5 to 40°C)

Electrical supply

220V 60Hz

Frame dimen­sions (WxDxH

62″ x 25″ x 43″ (1580 x 650 x 1100mm)

Working space (WxDxH)

78″ x 43″ x 43″ (2000 x 1100 x 1100mm)

Desktop PC

Not required

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