EFFECT OF MEDICAL ASH ON SHEAR PROPERTIES OF ASPHALT BINDER USING SUPERPAVE DYNAMIC SHEAR RHEOMETER (DSR)

摘要

This study had focused on the effect of medical ash mineral filler passing sieve No. 200 (0.075 mm) on the rheological shear properties of asphalt binder used for paving construction in Jordan. Mastic was prepared using medical ash mineral filler and an asphalt binder at various volume concentrations (5,10, 20, and 30%). The Superpave dynamic shear rheometer (DSR) device was used to measure the complex shear modules for asphalt binder and mastic in frequency sweep tests. The loading frequency of the test varied from 0.10 Hz to 10 Hz using the values of (0.1, 0.178, 0.30, 0.5, 1.0, 1.78, 3.0 5.0, and 10 Hz). The DSR tests covered a wide range of test temperatures from 10℃ to 70℃ divided linearly into seven temperatures (10, 20, 30, 40, 50, 60, and 70℃). The main objectives of the study were (1) to utilize the Superpave Dynamic Shear Rheometer (DSR) test for studying the behavior of asphalt mastic, (2) to investigate the effect of medical ash on the shear properties of asphalt binders obtained from the DSR, and (3) to study the effect of the medical ash addition on the fatigue resistance as well as rutting resistance of asphalt binders used for roads construction in Jordan. Several behaviors of asphalt binder and mastics were discussed during this study; mainly the complex shear modulus of binder and mastics were measured and analyzed. The rutting and fatigue responses of both the asphalt-medical ash mastics and the asphalt binder were analyzed. The study also illustrated the relationship between the loading frequency and the complex shear modulus values, and discussed the effect of loading frequency and temperatures variation on the behavior of asphalt mastic.