In this paper, an experimental study was conducted on the influence of water pressure on concrete strength. Specimens were put in a self-designed device, applying 0–4 MPa water pressure on concrete, and then taken out for both static and dynamic compressive tests. Results showed that high water pressure caused inevitable damage to concrete, leading to 13.4% reduction in strength under 4 MPa water pressure. Specimens with lower strength grade were damaged more severely while under the same water pressure. Also, as water pressure increased, the moisture content of concrete grew linearly, and the trend for specimens with higher compressive strength was slower. A correlation was established between the water content increment and the reduction rate of strength. Moreover, the dynamic compressive strength decreased as water pressure increased but still higher than the static strength, illustrating an apparent strain rate effect. Meanwhile, water pressure and moisture content increment barely had any influence upon DIF within the testing conditions. Furthermore, equations for calculating both static and dynamic reduction rates of strength were built, based either on water pressure or on moisture content increment caused by that. Equations for strength prediction were also provided.

中文翻译：

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高压对混凝土静，动态抗压强度的影响

本文针对水压对混凝土强度的影响进行了实验研究。将样品放入自行设计的设备中，在混凝土上施加0–4 MPa的水压，然后取出进行静态和动态压缩测试。结果表明，高水压会不可避免地损坏混凝土，在4 MPa水压下强度会降低13.4％。在相同的水压下，强度等级较低的试样会受到更严重的破坏。另外，随着水压的增加，混凝土的水分含量呈线性增长，抗压强度较高的试样的趋势也较慢。在含水量增加与强度降低率之间建立了相关性。此外，动态抗压强度随水压的增加而降低，但仍高于静态强度，说明了明显的应变率效应。同时，在测试条件下，水压和水分含量的增加对DIF几乎没有影响。此外，基于水压或由此引起的含水量增加，建立了用于计算强度的静态和动态降低率的方程式。还提供了强度预测方程。基于水压或由此引起的水分含量增加。还提供了强度预测方程。基于水压或由此引起的水分含量增加。还提供了强度预测方程。