硅酸盐学报2017，Vol.45Issue(11)：1605-1612,8.DOI:10.14062/j.issn.0454-5648.2017.11.06
应变率对硬化水泥净浆微观力学性能及徐变行为的影响
Strain Rate Effect on Micro-Mechanical Properties and Creep Behavior of Hardened Cement Paste
摘要
Abstract
The strain rate effect on the elastic modulus, indentation hardness, and micro creep of hardened cement paste was investigatedvia continuous stiffness measurement. The microstructure of the indentation zone was determined by scanning electron microscopy. The effect of microstructure on the mechanical and creep properties was analyzed. The results show that the homogeneous mechanical properties of cement pastes can be measuredvia continuous stiffness measurement with a maximum depth of 30μm. When the indentation depth (force) is greater than the critical minimum depth (force), the measured elastic modulus and indentation hardness will remain nearly a constant, reflecting the homogeneous mechanical properties of cement pastes. Within the strain rates ranging from 0.01 s-1 to 0.50 s-1, the strain rate has a negligible effect on the elastic modulus. However, the indentation hardness increases with increasing the strain rate, and their relationship can be well expressed by an empirical power law equation. Strain rate also affects the contact creep function during the holding stage. The greater the strain rate, the greater the contact creep function is, which is due to the fact that the creep will develop less during the loading stage at a greater strain rate. It is thus necessary to minimize the loading time to ensure correct measurement of the creep property.关键词
硬化水泥净浆/力学性能/微观徐变/连续刚度测试/应变率Key words
hardened cement paste/mechanical properties/micro creep/continuous stiffness measurement/strain rate分类
通用工业技术引用本文复制引用
魏亚,梁思明,高翔..应变率对硬化水泥净浆微观力学性能及徐变行为的影响[J].硅酸盐学报,2017,45(11):1605-1612,8.基金项目
国家自然科学基金项目(51578316,51778331). （51578316,51778331）
