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通过观测硬化水泥浆体的细观孔隙结构预测其宏观力学性能
作者:阚晋 彭兴黔 
单位:华侨大学土木工程学院 福建 厦门 361021 
关键词:硬化水泥浆体 微型CT 细观断裂模型 应力应变关系 极限拉伸强度 
分类号:TU501
出版年,卷(期):页码:2016,44(5):668-672
DOI:10.14062/j.issn.0454-5648.2016.05.08
摘要:

首先通过高分辨微型CT系统观测水灰比为0.5的水泥浆体内部微米级孔隙并对其尺寸进行统计分析,获得水泥浆体内部孔隙结构特征和两大类微米级孔隙的直径分布,然后引入孔隙介质细观断裂模型,将观测获得的孔隙特征作为模型参数,对水泥浆体的宏观力学性能进行计算,获得其应力–应变曲线和极限拉伸强度,最后将力学模型计算结果与实验结果进行对比分析。极限拉伸强度的计算和实验结果分别为9.47和7.96 MPa。微型CT系统可以准确地获取水泥浆体内部的微米级孔隙信息,孔隙结构信息引入细观断裂模型后的计算结果准确度较高。

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Micro-porous structures and macroscopic mechanical properties of hydrated cement paste were investigated. The pores in cement paste with water-cement ratio of 0.5 were observed by a high resolution micro-CT system. The micro-porous structures and the distributions of two types of micron-sized pores were analyzed. The mechanical properties were determined via introduction of pores parameters into a micro-fracture model. The stress-strain strain relationship and ultimate strength of cement paste subjected to uniaxial tension were predicted. The predicted data are consistent with the experimental results. The calculated and experimental ultimate tensile strengths are 9.47 and 7.96 MPa, respectively. The results show that the micro-CT system can be used to determine the parameters of the micron-sized pores in cement pastes accurately. The results calculated by the micro-fracture model are reliable. 

基金项目:
国家自然科学基金(11102002,51478197);福建省自然科学基金(2015J01015);华侨大学人才启动基金(12BS212)资助项目
作者简介:
阚 晋(1981—),男,博士,讲师。
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