东南大学学报（英文版）2022，Vol.38Issue(1)：9-14,6.DOI:10.3969/j.issn.1003-7985.2022.01.002
非饱和多孔沥青混合料冻融变形特征的试验研究
Experimental study on expansion and contraction of unsaturated porous asphalt mixture exposed to freeze-thaw cycles
摘要
Abstract
The expansion and contraction of an open-graded friction course(OGFC)with a nominal maximum aggregate size of 13.2 mm(OGFC-13)with three air void contents(AVCs)and six saturation degrees(SDs)exposed to freeze-thaw(FT)cycles were measured using strain gauges.Cantabro tests were conducted on OGFC-13 specimens before and after FT cycles to evaluate the degradation of raveling resistance.The effects of SD,AVC,and the number of FT cycles on the expansion and contraction of OGFC-13 and degradation of raveling resistance were analyzed.Results show that OGFC with low water saturation will contract to stability during the freezing process,whereas fully saturated OGFC will contract first and then expand to be stable.OGFC with a medium saturation experienced three stages,namely,contraction,expansion,and contraction,during the freezing process.For the OGFC with a low SD,the decrease in the void content can effectively reduce the low temperature shrinkage.By contrast,for the OGFC with a high SD,lower void content produces more temperature shrinkage at the beginning of freezing and less expansion at the end of freezing.The decreases in SD and AVC can effectively improve the raveling resistance of OGFCs exposed to FT cycles.关键词
开级配抗滑磨耗层(OGFC)/冻融/饱和度/变形/抗飞散Key words
open-graded friction course(OGFC)/freeze-thaw(FT)/saturation degree(SD)/volume change/anti-raveling分类
交通工程引用本文复制引用
陈俊,赵成,殷小晶..非饱和多孔沥青混合料冻融变形特征的试验研究[J].东南大学学报（英文版）,2022,38(1):9-14,6.基金项目
The National Natural Science Foundation of China(No.52178421),the Natural Science Foundation of Jiangsu Province(No.BK20191300),the Fundamental Research Funds for the Central Universities(No.B210202036). （No.52178421）
