Zhang Zheng-qi

Research on Relationship between Aging State and Low-Temperature Performance of Asphalt Mixture

Aging phenomenon of asphalt material exists in the course of mixing, spreading, and rolling of asphalt mixture, as well as the use in the asphalt pavement. The indirect tensile strength test was used to evaluate the performance of asphalt mixtures at low-temperature under different aging conditions. As compared with the results from the original short-term aging and the long-term aging asphalt mixtures, the results show that the original asphalt mixture cannot reflect the real performance of the asphalt mixture in the field. The short-term aging specimens are more sensitive than long-term aging specimens in evaluating the performance of the asphalt mixture at low temperature. Tests results also indicate that the consideration of aging during the evaluation of asphalt pavement performance is necessary.

Research on the Aplicatility of RTFOT Used with Modified Asphalt

This article evaluates the applicability of RTFOT used in modified asphalt. Further tests prove that there is obvious difference among asphalts after RTFOT for the distinction between modified asphalts and base asphalts, or modified asphalts. Then it’s wrong to restrict using a same index. So it’s necessary to mend when RTFOT is used on modified asphalt.

Research on Viscosity of Asphalt Mortar

In order to study the influence of filler on viscosity of mortar, the viscosity of mortar prepared with different filler type and FB was tested. The tests results show that type of filler has great influence on mortar viscosity, and the change of viscosity of mortars is obvious with the increasing of FB. German filler test and dry compaction test were also conducted to evaluate the influence. There have near 30¿ difference among construction temperature of mortar with different filler type and FB, therefore it is necessary to revise the current method to confirm mixture construction temperature considering the influence of filler on viscosity of mortar.