酸性花岗岩沥青混合料水稳性试验

Experiment on water stability of acid granite asphalt mixture

为提高高湿热地区花岗岩沥青混合料的长期水稳性能,分别进行单掺3%水泥、4%水泥及30%消石灰水浸泡处治,通过冻融、冻融烘循环的劈裂试验来评价酸性花岗岩沥青混合料的长期适用性与水稳性能,并与未处治酸性花岗岩沥青混合料进行对比分析。结果表明:随着冻融、冻融烘次数的增加,处治后酸性花岗岩沥青混合料在3种试验条件下的劈裂强度与残留强度比呈整体下降趋势;冻融循环条件下,4%水泥>3%水泥>30%消石灰水>未处治集料;冻融烘循环条件下,4%水泥>3%水泥>30%消石灰水>未处治集料。

In order to improve the long-term water stability performance of granite asphalt mixture in high humid and hot areas,3%cement,4%cement,and 30%hydrated lime water are sequentially added for soaking treatment.The long-term applicability and water stability performance of acidic granite asphalt mixture are evaluated through freeze-thaw and freeze-thaw drying cycle splitting tests,and compared and analyzed with untreated acidic granite asphalt mixture.The results show that the splitting strength and the ratio of splitting strength of the acid granite asphalt mixture under the three test conditions decrease with the increase of freeze-thaw and freezethaw drying times.Among them,4%cement>3%cement>30%sluice water>untreated aggregate under freeze-thaw cycle condition.Under the condition of freeze-thaw drying cycle,4%cement>3%cement>30%sluice water>untreated aggregate.