Performances Comparison of Mine Filler Asphalt Mortar and Diatomite Asphalt Mortar

Abstract

In order to study the different influences of mine filler and diatomite on asphalt mortar performance, asphalt mortars with 7% mix amount of mine filler and diatomite were tested for apparent viscosity at 135°C, penetration value at 25°C, and softening point. PI and PVN were used to evaluate the temperature sensitivity of the two kinds of asphalt mortars as well. Further, asphalt mortar bending test at low temperature were done to verify the good mechanical performance of diatomite asphalt mortar. Results indicate that, compared to mine filler, diatomite has stronger modified effect on asphalt, including apparent viscosity, penetration and softening point. And diatomite is more conducive to weakening temperature sensitivity of asphalt mortar. In addition, bending test indicates that diatomite asphalt mortar is more conducive to upgrade low temperature performance. Thus, it is significant for the preparation of diatomite modified asphalt concrete on the design of grade mixing ratio, so as to be conducive to promoting the use of diatomite modified asphalt concrete.