不同浸水历时水泥乳化沥青砂浆动态受压试验  

Experiment of Dynamic Compressive Behaviors of Cement Asphalt Mortar under Different Water Immersion Duration

作　　者：徐浩[1] 王平[2] 孙宏友[2] 曾晓辉[2] 赵坪锐[2] 

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《建筑材料学报》2015年第5期861-866,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51425804;U1234201);国家重点基础研究发展计划(973计划)项目(2013CB036202);四川省科技创新研究团队项目(2011JTD008)

摘　　要：水泥沥青（CA）砂浆试件历经0,7,14,30,60d水浸泡后,在电子万能试验机上进行了应变速率1×10-5-1×10-2s-1的动态压缩试验,研究了水浸泡历时与应变速率对CA砂浆抗压强度、弹性模量、峰值应变以及应力-应变全曲线等动态特性的影响.结果表明：水浸泡历时和加载应变速率对CA砂浆的力学性能影响明显;CA砂浆的抗压强度和弹性模量随应变速率的增大而增大;相同应变速率下,CA砂浆的抗压强度和弹性模量均随水浸泡历时的增加先减小后增大;CA砂浆的平均抗压强度最大降低幅度为46.31%,平均弹性模量最大降低幅度为44.91%;CA砂浆的峰值应变随应变速率与水浸泡历时的增加呈增大的趋势,且水浸泡对峰值应变的影响大于应变速率对峰值应变的影响.Dynamic compression test of cement asphalt（CA） mortar specimens immersed in water for 0, 7, 14, 30, 60 d, was carried out using an electronic universal test machine with the strain rates ranging from 1X 10-Ss-1 to 1 X 10-2 s-1. The＇stress-strain full curves, the compressive strength, the elastic modulus and the peak strain of CA mortar at different strain rates and water immersion durations were analyzed and the effects of strain rates and water immersion duration on these dynamic behaviors were studied. Results show that the mechanical property of CA mortar is affected significantly by strain rates and water immer- sion duration. The compressive strength and elastic modulus increase with increasing strain rate. In the same strain rate, the compressive strength and elastic modulus decrease first and then increase with in- creasing of water immersion duration. The largest reduction of average compressive strength of CA mortar is 46.31%, and the largest reduction of elastic modulus of CA mortar is 44. 91%. The peak strain of CA mortar shows a trend of increase with the strain rates and water immersion, and the influence of water im- mersion time on the peak strain is larger than that of the strain rate.

关 键 词：水泥沥青(CA)砂浆 应变速率 水浸泡 动态特性 

分 类 号：U414[交通运输工程—道路与铁道工程]