摘要
Abstract
Porous asphalt mixture is widely used in the humid and hot regions of southern China,but its performance is easily affected due to the complex hydrothermal environment in the area.This study utilized a self-developed water heat coupling test equipment to conduct long-term water temperature cycle coupling tests(vacuum saturation for 15 minutes+60℃constant temperature water bath for 24 hours+40℃thermal oxygen aging for 12 hours)and control experiments to investigate the effect of long-term water heat coupling on the road performance of porous asphalt mixtures.The results showed that as the number of cycles increased,the high-temperature performance and water stability of the mixture gradually decreased under different water heat coupling conditions,and the performance degradation was more severe under saturated conditions.When the number of cycles reached 100,the degree of high-temperature performance degradation reached 26.1％,and the residual stability was 82.1％;The negative impact of a single water bath on high-temperature performance is more severe than that of a single thermal oxygen treatment,but the difference in its impact on water stability is not significant;Grey correlation analysis shows that environmental factors have a greater impact on the degradation of high-temperature performance and water stability than the number of cycles;The high-temperature performance and water stability prediction models established with environmental conditions and cycle times as independent variables have determination coefficients of 0.883 and 0.872,respectively,indicating they can effectively predict the relevant performance of porous asphalt mixtures.关键词
多孔沥青混合料/水-热耦合/高温性能/灰色关联分析/性能预测Key words
porous asphalt mixture/water heat coupling/high temperature performance/grey correlation analysis/performance prediction分类
交通工程
