Texas Overlay Tester
Designed according to the proposed ASTM
Dedicated no compromise Texas Overlay machine
Integrated surface mounted touch screen control (Touch+)
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 (CS-TOT) 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 CS-TOT it is possible to characterize both the crack initiation and crack propagation properties of asphalt mixtures. Cox & Sons has developed the CS-TOT, which is a dedicated, state-of-the-art piece of equipment for carrying out this test.

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
  • Designed according to the proposed ASTM
  • Integral surface mounted touch screen control (Touch +)
  • Double GSF cold rolled container slides for ultra accurate inline sample deformation
  • Intelligently designed specimen gluing and “zero stress” carrying frame
  • Interface SSM environmentally sealed S-Type load cell
  • Fitted with high performance hydraulic actuator and powerpack
  • Ergonomically designed for easy operation
  • Designed and manufactured in the United States

Resolution of Displacement Measurment μm 1 (0.00004 inch)
Control Loop Rate Hz >1000
Load Cell Capacity kN 25 (5500 lb)
Load Cell Accuracy (%FS) 0.25
Cycle Time (s) 5 to 1000
Cycle Time Measurement Resolution (%) 0.1
Temperature Control Range °C -5 to 40 (23 to 104 °F)
Temperature Control Accuracy ±°C 0.5 (0.9 °F)
Ambient Temperature Range °C 15 to 30 (59 to 86 °F)
Test End Conditions (0 to 100)% load reduction and/or (0 to 10000) cycles
Specimen Length mm (inch)
Specimen Height mm (inch)
Specimen Width mm (inch)
150 ± 2 (5.9 ± 0.08)
38 to 50 ± 0.5 (1.5 to 2 ± 0.02)
76 (3)
Plate Length mm
Plate Width mm
Plate Height mm
300 (11.8 inch)
150 (5.9 inch)
Optional 13 or 19 (0.51 or 0.75 inch)
Base Plate Material Stainless Steel
Base Plate Hardness (Brinell Hardness) > 95 (Not lower than that of 6061-T6 aluminum)
Plate Groove Depth x Width mm (inch) 1.5 x 1.3 (0.059 x 0.051)
Plate Groove Separation mm (inch) 6.35 (0.25)
Initial Separation of Plates mm (inch) 2 (0.079)
Vertical movement of sample (% of crack opening) <3
Dimensions (WxDxH) mm (inch) 1580 x 650 x 1100 (62 x 25 x 43)
Weight Kg (lb) 500 (1102) (approx.)
Electrical supply CS-TOT: 1 Ph 240 V 50 Hz
CS-TOT60: 1 Ph 110 V 60 Hz
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