Influence of strain rate and water content on mechanical behavior of dam concrete
Influence of strain rate and water content on mechanical behavior of dam concrete
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DOI：
10.1016/j.conbuildmat.2012.06.046
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发表时间：
2012-11
影响因子：
7.4
通讯作者：
Shengxing Wu;Xudong Chen;Jikai Zhou
中科院分区：
文献类型：
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作者：
Shengxing Wu;Xudong Chen;Jikai Zhou
研究了应变率和含水量对大坝混凝土力学性能的影响。水胶比（w/B）为0.45的筛分混凝土试件在应变率为10−6、10−5、10− 4和10−3s−1的条件下承受四点荷载。所有这些测试都是用闭环伺服控制的刚性测试机进行的。试验提供了选定应变率下的应力-应变曲线。应变率敏感性是通过应力-应变曲线、最大应力（抗弯强度）、动态增加因子、弹性模量和泊松比来衡量的。比较了不同含水量（0%、40%、70%和100%）下的应变率敏感性。结果表明，应变速率和含水量对材料的性能有显著影响。弯曲强度和弹性模量均随着应变率的升高而增加，而泊松比保持不变。在相同的应变速率下，含水率的增加会使弹性模量增加，但抗折强度降低。
The influence of strain rate and water content on the mechanical behavior of dam concrete has been investigated. Sieved concrete specimens with water-binder ratio (w/b) 0.45 are subjected to four-point loading at strain rates of 10−6, 10−5, 10−4and 10−3s−1. All these tests were performed with a closed loop servo-controlled stiff testing machine. The tests provide stress–strain curves at the chosen strain rates. Strain rate sensitivity is measured with in terms of the stress–strain curves, the maximum stress (flexural strength), dynamic increase factor, elastic modulus and Poisson’s ratio. Strain rate sensitivities are compared for different water content (0%, 40%, 70% and 100%). The obtained results showed significant influences of strain rate and water content on materials behavior. Both flexural strength and elastic modulus increased with higher strain rates, while Poisson’s ratio remained unchanged. At same strain rate, increasing water content would increase elastic modulus, but lower the flexural strength.