ABSTRACT
Aging and moisture induced adhesion reduction of high viscosity modified bitumen in porous asphalt mixture was studied. Specifically, PAV and water bath were adopted to simulate the aging and moisture damage process of porous asphalt mixture in the field respectively. Meanwhile, photoelectric colorimetry were utilized to measure the adhesion rates between high viscosity modified bitumen and basalt aggregates after aging and moisture conditioning. Moreover, pull-out test were conducted to test the adhesion strength of aggregate-bitumen-aggregate (ABA) system after aging and moisture conditioning. Results show that after same water bath duration, the adhesion rates of high viscosity modified bitumen and the adhesion strength of ABA system decreased 16.0% and 58.3% respectively in the first 20h PAV aging. The first 5 days’ water bath had obvious effects on adhesion reduction of high viscosity modified bitumen (reduced by 47.7% for average). Moreover, the adhesion strength of ABA system would reduce obviously in the first 10d water bath (reduced by 48.4% for average). Compared with aging induced damage, moisture induced damage had more significant effects on the adhesion rates of high viscosity modified bitumen. Meanwhile, both aging and moisture induced damage can obviously lead to the adhesion strength reduction of ABA system.
