STRAIN-RATE SENSITIVE BEHAVIOR OF CEMENT PASTE AND MORTAR IN COMPRESSION
STRAIN-RATE SENSITIVE BEHAVIOR OF CEMENT PASTE AND MORTAR IN COMPRESSION
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DOI：
10.14359/1931
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发表时间：
1990-09
影响因子：
1.7
通讯作者：
S. Harsh;Z. Shen;D. Darwin
中科院分区：
文献类型：
--
作者：
S. Harsh;Z. Shen;D. Darwin
对混凝土水泥浆和砂浆成分的应变率敏感性进行了实验研究。浇注后 27 至 29 天，将饱和水泥浆和砂浆样本压缩至 15,000 微应变，应变速率范围为 0.3 至 300,000 微应变/秒。使用的水灰比为0.3、0.4和0.5。材料的应变率敏感性是根据初始弹性模量、最大应力和相应应变来测量的。应变率每增加一个数量级，水泥浆和砂浆的初始弹性模量和强度分别增加7%和15%。最大应力下的应变对于最低应变率来说是最大的。随着应变速率的增加，最大应力处的应变先减小后增大。
The strain-rate sensitivity of the cement paste and mortar constituents of concrete is studied experimentally. Saturated cement paste and mortar specimens are loaded in compression to 15,000 microstrains, 27 to 29 days after casting, using strain rates ranging from 0.3 to 300,000 microstrains/sec. Water-cement ratios of 0.3, 0.4, and 0.5 are used. Strain-rate sensitivity of the material is measured in terms of the initial elastic moduli, maximum stress, and corresponding strain. The initial elastic moduli and the strength of cement paste and mortar increase by 7% and 15%, respectively, with each order of magnitude increase in strain rate. The strain at the maximum stress is the greatest for the lowest strain rate. With an increase in strain rate, the strain at the maximum stress first decreases and then increases.