Influence of High Water Pressure on Static and Dynamic Compressive Strength of Concrete

Jikai Zhou; Xiyao Zhao; Yu Nie; Yun Tian

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Influence of High Water Pressure on Static and Dynamic Compressive Strength of Concrete

机译：高水压对混凝土静态和动态抗压强度的影响

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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.

机译：本文对水压对混凝土强度的影响进行了实验研究。将标本放入自动设计的装置中，在混凝土上施加0-4℃，然后取出静态和动态压缩试验。结果表明，高水压对混凝土造成不可避免的损害，导致强度降低13.4％，低于4°的水压。强度等级较低的标本在相同的水压下损坏。而且，随着水压的增加，混凝土的水分含量线性地增长，具有较高抗压强度的标本的趋势较慢。在水含量增量和减少强度率之间建立了相关性。此外，随着水压增加但仍然高于静态强度，动态抗压强度降低，说明表观应变速率效应。同时，水压和水分含量增量几乎没有影响测试条件下的差异。此外，基于水压或由此引起的水分含量增量，构建了计算静态和动态降低速率的方程。还提供了强度预测的方程。

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《Advances in civil engineering》 |2020年第1期|共9页
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Jikai Zhou; Xiyao Zhao; Yu Nie; Yun Tian;
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机译：高应变速率下初始静态劈裂拉伸荷载对混凝土芯动态抗压强度的影响
2. Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests [J] . Wang Shiming, Dong Longjun, Zhou Jian Shock and vibration . 2018,第PTa7期

机译：基于分裂霍普金森压力棒试验的早期年龄对混凝土的波速和动态抗压强度的影响
3. Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests [J] . Shiming Wang, Longjun Dong, Jian Zhou Shock and vibration . 2018,第1期

机译：基于分裂Hopkinson压力棒试验的混凝土波速和动态抗压强度的影响
4. EFFECT OF SPECIMEN SIZE OF STATIC COMPRESSIVE TEST ON THE DYNAMIC INCREASE FACTOR OF CONCRETE COMPRESSIVE STRENGTH [C] . SANGHO LEE, CHUNGHYEON KIM, JAE-YEOL CHO International conference on structures under shock and impact . 2018

机译：静压试验试样尺寸对混凝土抗压强度动态增加因子的影响
5. Size effect in normal and high-strength concrete cylinders subjected to static and dynamic axial compressive loads. [D] . Elfahal, Motaz M. 2002

机译：承受静态和动态轴向压缩载荷的普通和高强度混凝土圆柱体的尺寸效应。
6. Prediction of Static Modulus and Compressive Strength of Concrete from Dynamic Modulus Associated with Wave Velocity and Resonance Frequency Using Machine Learning Techniques [O] . Jong Yil Park, Sung-Han Sim, Young Geun Yoon, 2020

机译：采用机器学习技术预测与波速和谐振频率相关的动态模量与波速和谐振频率相关的混凝土压缩强度
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. Equipment and Protocols for Quasi-Static and Dynamic Tests of Very-High-Strength Concrete (VHSC) and High-Strength High-Ductility Concrete (HSHDC). [R] . Williams, B. A., Moser, R. D., Heard, W. F., 2016

机译：非常高强度混凝土（VHsC）和高强度高延性混凝土（HsHDC）准静态和动态试验的设备和方案。

Influence of High Water Pressure on Static and Dynamic Compressive Strength of Concrete

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