I.Product standard: 1) DSHD -0719 Automatic Wheel Track tester is made as per T0719 in the Industry Standard JTJ052 Specification and Test Methods of Bitumen and Bituminous Mixture for Highway Engineering. 2) DSHD -0719 Automatic Wheel Track tester is specially applied to determine the resistance to rutting of bituminous mixture at high temperature. 3) DSHD -0719 Automatic Wheel Track tester can also be used as an auxiliary check method during bituminous mixture ratio design. II.Technical parameters 1. Rolling speed of roller: 42±1 times/min (one way); 2. Test vehicle moving distance: 230±10mm; 3. Hardness of rubber for rolling wheel: 78±2 (International Standard Hardness); 4. Pressure between rolling wheel and test mold: 0.7±0.05MPa; 5. Test mold size: 300*300*50mm; 6. Measurement range for displacement: 0~30 mm; 7. Measurement accuracy for displacement: less than 0.01 mm; 8. Test duration: 60~240min; 9. Temperature controlling range for constant temperature case: room temperature~80°C; 10. Temperature controlling accuracy: ±0.3°C; 11. Power supply: 380 V, 50 Hz, 3 kW;