For the most coastal areas where the air is very humid, study on the effect of humidity on the performance of asphalt has its practical significance. However, limited research has been done to investigate the effect of humidity on rheo- logical properties of asphalt. In this study, asphalt binders were aged in the pressure aging vessel (PAV) under different con- ditions of moisture and aging time. Then Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) measure- ments were conducted to obtain the parameters relating to the complex modulus, phase angle, failure temperature, and creep stiffness. It was found that the low temperature performance decreased as evidenced by the results of the creep stiffness. While there were no significant differences among conditioned binders based on complex modulus G* and phase angle δ, it was found that the δ value increased when the humidity increased from 0% to 80%, and then the δ value decreased when the humidity increased to 100%. In addition, the results of the failure temperature indicated that the humidity of 80% would be a critical point for the high temperature performance of the asphalt binders. (1-3) . In this study, rheological properties of asphalt after PAV aging in the presence of 0%, 80%, and 100% moisture, respectively,
Crumb rubber modified asphalts (CRMA) mastic is an important part of CRMA mixture, however, the testing condition restricts its research in our country. In order to study the effect of fillers on the high temperature properties of CRMA mastic, mineral powder, and cement were selected as the fillers and the CRMA mastic were prepared using different filler-to-binder ratios (F/B). The study evaluated the high temperature properties of different CRMA mastic by zero shear viscosity and fail temperature. Test results indicate that with the increase of F/B, fail temperature and zero shear viscosity in the creep recovery phase of CRMA mastic are gradually larger, and the high temperature properties of CRMA mastic has been significantly improved. Compared with the same F/B, the fail temperature and zero shear viscosity in the creep recovery phase of CRMA mastic, which using mineral powder as filler is larger than the one, which using cement as filler. Mineral powder is better than cement in the aspect of improving the high temperature properties of CRMA mastic. The result of this paper can provide a theoretical basis for improving the road performance of CRMA mastic.
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