摘要
为了研究冻融循环、荷载水平/次数及试验温度影响下大粒径透水沥青混合料(large stone porous asphalt mixes, LSPM)力学性能及空隙损伤演化规律,采用20℃无侧限抗压强度试验、15℃劈裂强度试验、60℃贯入强度试验及Overlay Tester(OT)试验探究冻融循环不同阶段LSPM力学性能及空隙率损伤情况,同时开展车辙试验研究荷载次数、大小及试验温度对空隙率衰减影响。结果表明:随冻融循环次数增加,LSPM无侧限抗压强度、劈裂强度及贯入强度均呈指数型下降趋势,其黏聚力随冻融次数增加呈指数型下降,内摩擦角无显著变化;LSPM抗反射裂缝性能受冻融循环影响显著,荷载损失率及第一周期荷载损失率随着冻融循环次数增加呈上升趋势,50%荷载损失率的荷载次数逐渐降低。LSPM空隙率随冻融循环次数增加呈指数型上升趋势,受荷载次数影响较显著,但受荷载大小影响不明显;随试验温度升高,LSPM空隙率呈指数型下降趋势。
In order to study the mechanical properties and void damage evolution of large stone permeable asphalt mixtures(LSPM)under the influence of freeze-thaw cycles,load levels/times,and test temperatures,20℃unconfined compressive strength test,15 C splitting strength test,60℃penetration strength test,and Overlay Tester(OT)are used to explore the mechanical properties and void damage of LSPM at different stages of freeze-thaw cycles,at the same time,rutting tests are carried out to study the effects of load frequency,size,and test temperature on the attenuation of void fraction.The results show that:as the number of freeze-thaw cycles increases,the unconfined compressive strength,splitting strength,and penetration strength of LSPM all show an exponential downward trend,its cohesion decreases exponentially with the increase of freeze-thaw cycles,and there is no significant change in the internal friction angle;the anti-reflection cracking performance of LSPM is significantly affected by freezethaw cycles.The load loss rate and the first cycle load loss rate show an upward trend with the increase of freeze-thaw cycles,while the load loss rate of 50%gradually decreases.The porosity of LSPM increases exponentially with the number of freeze-thaw cycles,and is significantly affected by the number of loads,but not significantly affected by the magnitude of loads.As the experimental temperature increases,the porosity of LSPM shows an exponential decreasing trend.
作者
李绍辉
王传刚
郝培文
袁高昂
LI Shao-hui;WANG Chuan-gang;HAO Pei-wen;YUAN Gao-ang(School of Highway,Chang'an University,Xi'an 710064,China)
出处
《公路》
北大核心
2025年第4期1-8,共8页
Highway
基金
陕西省自然科学基金项目,项目编号2021JQ-280
鄂尔多斯市科技重大专项,项目编号2022EEDSKJZDX013
濮阳市重大科技专项项目经费支持项目,项目编号20230203。
关键词
大粒径透水沥青混合料
力学性能
空隙率
冻融循环
性能损伤
large particle porous asphalt mixes(LSPM)
mechanical properties
void rate
freezethaw cycle
performance damage
