CA砂浆力学性能的应变率敏感性及本构关系  

Strain Rate Sensitivity and Constitutive Relation of Mechanical Properties of CA Mortar

作　　者：张胜[1,2] 傅强[1] 周锡玲[1,3] 龙广成[1] 谢友均[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]国防科学技术大学指挥军官基础教育学院,湖南长沙410072 [3]湖南农业大学工学院,湖南长沙410128

出　　处：《华南理工大学学报（自然科学版）》2014年第11期106-112,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"973"计划项目(2013CB036200);国家自然科学基金资助项目(51278498)

摘　　要：为研究水泥乳化沥青砂浆(CA砂浆)力学性能的应变率敏感性,采用微机控制电子万能试验机进行了CA砂浆在不同应变率下的应力-应变压缩试验.结果表明,CA砂浆的力学性能随着应变率的增大而增大,裂纹扩展速度的限制、侧向变形的惯性作用及沥青网络结构的横向约束导致了CA砂浆力学性能的应变率敏感性.文中还建立了CA砂浆的应变率本构关系,该本构关系能够精确模拟CA砂浆的峰值强度与弹性模量,整个变形过程中的拟合结果与试验结果的复相关系数均大于0.93.通过对应变率本构关系的敏感性分析可知,应变率越高,CA砂浆的韧性和应变率敏感性越低.In order to investigate the strain rate sensitivity of the mechanical properties of cement and asphalt mortar（ CA mortar）,the stress-strain compressive experiment of CA mortar at different strain rates was performed by means of a microcomputer-controlling electronic universal testing machine. The results show that the mechanical properties of CA mortar increase with the strain rate,and the strain rate sensitivities are attributed to the limit of the crack propagation velocity,the inertial effect of the lateral deformation and the horizontal restraint of the asphalt network structure. Furthermore,a constitutive relation of strain rates is established. The constitutive relation can accurately stimulate the peak strength and elastic modulus of CA mortar,and the multiple correlation coefficients of the fitting and experimental results in the whole deformation process are both greater than 0. 93. It is also found from the analysis of the sensitivity of constitutive relation that,the higher the strain rate is,the lower the toughness and strain rate sensitivity of CA mortar will be.

关 键 词：水泥乳化沥青砂浆 应变率敏感性 应力-应变曲线 本构关系 韧性 

分 类 号：TU525.9[建筑科学—建筑技术科学]