沥青混合料冻融损伤特性研究  

Research on asphalt mixture freezing-thawing damage performance

作　　者：李兆生[1] 谭忆秋[1] 

机构地区：[1]哈尔滨工业大学交通科学与工程学院,哈尔滨150090

出　　处：《中国科技论文》2014年第11期1279-1281,共3页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20102302120058)

摘　　要：基于Maxwell模型建立了沥青混合料冻融损伤本构方程，以冻融后的劈裂强度作为损伤变量，分析沥青混合料的冻融损伤过程。分析表明，沥青混合料的低温劈裂强度随着冻融循环次数的增加而减小。冻融损伤过程大致分为快速损伤期、稳定损伤期及损伤发展期3个阶段。空隙率大小对沥青混合料的冻融损伤有较大影响。多孔沥青混合料劈裂强度比稳定值约为40％，沥青混凝土劈裂强度比约为70％，在4～8个冻融循环之后达到冻融损伤稳定期。A damage constitutive equation was established based on Maxwell model.The indirect tensile （IDT）strength was ap-plied as the damage variable to characterize the freezing-thawing damage progress.Result shows that the IDT strength of asphalt mixture at low temperature decreased with the increasing cycles of freezing-thawing.The progress of the freezing-thawing damage can be divided into three damage phases,including rapid damage phase,stable damage phase and developing damage phase.The air void percentage of the asphalt mixture has great influence on freezing-thawing damage.The stable value of porous asphalt mix-ture cleavage strength ratio was around 40%,and the ratio of asphalt concrete IDT strength was around 70%.After 4-8 freezing and thawing cycles,the freezing-thawing damage develops into stable damage phase.

关 键 词：沥青混合料 冻融循环 损伤 本构方程 

分 类 号：U414[交通运输工程—道路与铁道工程]