多孔沥青混合料老化及水稳定性研究

摘要

By specimens aging impact assessment permeable asphalt concrete pavement under dif-ferent conditions,different degrees of water against and compare different maximum nominal particle size gradation on engineering properties of difference.The results show that the indirect tensile strength,stabil-ity,resilience modulus,strength and other engineering properties after aging PAC specimens are showing an increasing trend,of which the best high viscosity modified asphalt,SBS modified asphalt,followed by 70 straight distilled bitumen minimum.Road test site core drilling specimens aged 60 ℃ viscosity index higher than the results of laboratory four days of aging,but showing a similar trend,display scene PAC pavement aging situation is obvious,and the use of high viscosity modified asphalt will not only help strength increase,but also slow the aging rate.%通过对试件进行不同程度老化评估透水沥青混凝土路面在不同水侵害条件下的影响，并比较不同最大公称粒径的级配在工程性质上的差异。结果显示，PAC 试件老化后的间接抗拉强度、稳定度、回弹模量等工程性质强度都呈现增加趋势，其中以高黏度改性沥青最佳，SBS 改性沥青次之，70号直馏沥青最低。试验路现场钻芯试件的60℃黏度老化指数高于实验室4 d 老化的结果，但呈现出相近趋势，显示现场 PAC 路面老化情形明显，且使用黏度较高的改性沥青不但有助于强度提升，更可以减缓其老化速度。