赤泥填料对排水沥青混合料路用性能的影响

Influence of red mud filler on road performance of drainage asphalt mixture

为探究赤泥填料对排水沥青混合料路用性能的影响,首先选择两种国产高黏改性剂PT-HVA和AR-HVA制备得到高黏改性沥青,并将成品苯乙烯-丁二烯-苯乙烯(styrene-butadiene-styrene,SBS)改性沥青作为对照组,对三种改性沥青进行各项沥青性能试验。结果表明:两种改性剂的最佳掺量均为15%。接着以三种改性沥青为胶结料配制三种排水性沥青混合料(填料为赤泥和矿粉),并进行各项路用性能试验。结果表明:由赤泥制备的混合料的路用性能良好,其中AR-HVA高黏改性沥青+赤泥制备的混合料性能最优,动稳定度达11053次/mm,残留稳定度为91.46%,冻融劈裂比为89.60%,飞散损失为5.20%,老化系数为24.60%。同时,由赤泥制备而成的混合料的弯拉强度和弯拉应变比由矿粉制备的混合料的小,这表明赤泥虽能有效地提高混合料的高温性能、水稳性能、抗松散性能和抗老化性能,但会降低混合料的低温性能。

To explore the influence of red mud filler on the road performance of drainage asphalt mixture,this study first selected two domestic high-viscosity modifiers PT-HVA and AR-HVA to prepare high-viscosity modified asphalt.The finished styrene-butadiene-styrene(SBS)modified asphalt was taken as the control,and various asphalt performance tests were carried out on the three kinds of modified asphalt.The results indicate that the best mixing amount of the two modifiers is 15%.Then,three kinds of drainage asphalt mixtures were prepared with the three kinds of modified asphalt as cementing materials,in which the fillers were red mud and mineral powder.The road performance tests of the three kinds of drainage asphalt mixtures were carried out.The results show that the road performance of the mixtures prepared with red mud is good,among which the mixture prepared from AR-HVA high-viscosity modified asphalt and red mud has the best performance with dynamic stability of 11053 times/mm,residual stability of 91.46%,a freeze-thaw splitting ratio of 89.60%,scattering loss of 5.20%,and an aging coefficient of 24.60%.The flexural tensile strength and strain of the mixtures prepared with red mud are smaller than those of the mixtures prepared with mineral powder.This shows that although red mud can effectively improve the high-temperature performance,water stability,anti-loosening performance,and anti-aging performance of the mixtures,it degrades their low-temperature performance.