CRTS Ⅱ型水泥乳化沥青砂浆力学性能的应变率效应及模型  

Strain Rate Effect and Modeling of Mechanical Properties of CRTS Ⅱ Type Cement and Asphalt Mortar

作　　者：傅强[1] 谢友均[1] 郑克仁[1] 宋昊[1] 周锡玲[1,2] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]湖南农业大学工学院,长沙410128

出　　处：《硅酸盐学报》2014年第8期989-995,共7页Journal of The Chinese Ceramic Society

基　　金：国家“973”计划(2013CB036200);国家自然科学基金(51278498,50978257)资助项目

摘　　要：研究了CRTS Ⅱ型水泥乳化沥青砂浆(CA砂浆)应力--应变关系的应变率效应,利用统计损伤力学的方法建立了CA砂浆的应变率本构模型。结果表明:随着应变率的提高,CA砂浆通过增加应力和产生更多细小裂纹来抵消和耗散外部能量,CA砂浆的抗压强度增大,破坏时的贯通裂纹增多,碎裂程度增大;CRTS Ⅱ型CA砂浆力学性能的应变率效应低于CRTS I型CA砂浆的。用建立的应变率本构模型对CRTS Ⅱ型CA砂浆的应变率效应进行拟合,其结果与实验结果的相关系数均大于0.98,对CRTS I型CA砂浆的拟合结果与实验结果的相关系数均大于0.97,拟合结果与实验结果在峰值强度前的相关性较好,峰值强度后的相关性相对较差。The strain rate effect of stress-strain relationship of CRTS II type cement and asphalt mortar（CA mortar} was inves- tigated,and the strain rate constitutive model of CA mortar was proposed based on the statistical damage mechanics. The re- sults show that CA mortar offsets and dissipates the external energy by increasing stress and producing more small cracks, and the compressive strength of CA mortar increases. The through cracks are more in the failure and the fragmentation degree in- creases with the increase of strain rate. The strain rate effect on the mechanical performance of CRTS II type CA mortar is low- er than that of CRTS I type CA mortar. For CRTS II type CA mortar, the correlation coefficient between the predicted data by the proposed strain rate constitutive model and the experimental results is 〉 0. 98, and for CRTS I type CA mortar, the corre- lation coefficient is 〉 0.97. The predicted data are well correlated to the experimental results before the peak strength, but the correlation is relatively poor after the peak strength.

关 键 词：水泥乳化沥青砂浆 应变率 抗压强度 本构模型 相关系数 

分 类 号：TU525.9[建筑科学—建筑技术科学]