Abstract: The physical and mechanical properties of asphalt mortars respectively mixed with 7% mine filler and with 7% diatomite were tested, the physical tests including point test, penetration test and Brookfield viscosity test, the mechanical tests including impact test and three-point bending test. The physical tests indicate that the diatomite can significantly strengthen the high and low temperature performance of asphalt. In addition, diatomite is more conducive to weakening temperature sensitivity of asphalt mortar. The mechanical tests indicate that diatomite asphalt mortar has better impact resistance performance and higher deformation resistance at low temperature. Thus, it is significant for 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 mortar.

Key words: road engineering, asphalt mortar, temperature sensitivity, impact test, bending test