粉胶比对沥青混合料路用性能影响的试验研究

合理的粉胶比有利于提高沥青混合料的路用性能。试验在不同粉胶比条件下,通过车辙试验、低温弯曲试验、浸水马歇尔和冻融劈裂试验,分析沥青混合料的高温性能、低温性能和水稳性的变化,以确定合理的粉胶比范围。试验结果表明：粉胶比的增大,动稳定度增大,在粉胶比为1.2时出现峰值,随后开始下降;弯拉应变随粉胶比的增大而增大,粉胶比在1.0-1.1之间达到峰值,之后开始减小;劲度模量先减小后增大,呈凹形曲线,粉胶比为1.0时达到最小值;残留稳定度随粉胶比变化呈现增加后减小变化,最大值出现在粉胶比为1.0左右;冻融劈裂强度比先增大后减小,最大值在1.0-1.2范围内。综合考虑,在进行沥青混合料配合比设计时,粉胶比宜控制在0.9-1.2范围内。

The Experimental Study on the Filler-asphalt Ratio on Road Performance of Aphalt Mixture

Reasonable filler-asphalt ratio can help improve road performance of asphalt mixture. Under different filler-asphalt ratios,the rutting test,low-temperature bending test,immersion Marshall and freeze-thaw splitting test were carried out to analyze the high and low temperature performance of asphalt mixture as well as water stability,in order to determine the range of reasonable fillerasphalt ratio. Experimental results showed that with the increase of the filler-asphalt ratio,dynamic stability increased with peak at filler-asphalt ratio of 1. 2,then began to decline. Bending tensile strain increased with the increase of the ratio of filler-asphalt ratio, and reached the peak while filler-asphalt ratio was between 1. 0- 1. 1,then began to decrease. Stiffness modulus increased first and then decreased and showed as a concave curve with minimum value at filler-asphalt ratio of 1. 0. Residual stability increased first and then decrease with peak value at filler-asphalt ratio of 1. 0. Freeze-thaw splitting strength first increased then decreased,and the maximum value was in the range of 1. 0- 1. 3. Therefore,the filler-asphalt ratio should be controlled in the range of 0. 9- 1. 2 while designing the mix proportion of asphalt mixture.