EFFECT OF WATER PRESSURE ON CONCRETE STRENGTH

机译：水分压力对混凝土强度的影响

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This describes a laboratory study of the effect of immersion in water at pressure on the strength of concrete specimens. Compression and flexure tests were carried out whilst the concrete was under water pressure and also after depressurisation. It is found that high water pressure, equivalent to submersion at ocean depths (6000 metres), causes damage directly to the concrete. There is a loss of compressive strength of about one quarter and a flexural strength loss of about one half. This is found to be because the pressurisation produces microcracking, particularly around the coarse aggregate surfaces. Tests on concrete covered with an impermeable membrane suggest that this damage is caused by the mechanical effect of the high confinement, rather than by permeation of the water. Tests on cement paste and on high grade concrete specimens indicate that the mechanism of strength loss depends upon the difference in mechanical properties between the cement paste and the aggregate. In complete contrast, at lower water pressures equivalent to submersion at sea depths (below 1000 metres), loss of strength only occurs if the concrete is depressurised and occurs as a result of water entering the concrete.

机译：这描述了在压力下浸入水中对混凝土试样强度的影响的实验室研究。在混凝土处于水压下以及减压后进行压缩和挠曲测试。发现高水压相当于沉入海洋深处（6000米）会直接对混凝土造成破坏。抗压强度损失约为四分之一，抗弯强度损失约为二分之一。发现这是因为加压会产生微裂纹，特别是在粗集料表面附近。在覆盖有不透水膜的混凝土上进行的测试表明，这种损坏是由高密闭空间的机械作用引起的，而不是由水的渗透引起的。对水泥浆和高级混凝土试样的测试表明，强度损失的机理取决于水泥浆和骨料之间的机械性能差异。完全相反，在较低的水压下相当于海深处的淹没（低于1000米），强度损失仅在混凝土减压时发生，并且是由于水进入混凝土而发生的。

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来源
《Second International Conference on Concrete Under Severe Conditions Vol.2 CONSEC '98, Jun 21-24, 1998, Tromso, Norway》|1998年|p.978-987|共10页
会议地点 Tromso(NO);Tromso(NO)
作者
N. CLAYTON;
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作者单位

Building Research Establishment, Watford, UK;

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会议组织
原文格式 PDF
正文语种 eng
中图分类建筑科学;
关键词
high-pressure water; low-pressure water; compressive strength; flexural strength; microcracking; pressurisation; confinement; depressurisation;

机译：高压水低压水；抗压强度;抗弯强度;微裂纹加压；禁闭减压;

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机译：纤维增强超高强度混凝土的剥落电阻对ISO-834标准火灾曲线进行：热应变和水蒸气压力的影响
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

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8. Ultra High-Strength Steel Fibre Reinforced Concrete. Part 1. Basic StrengthProperties of Compresit Matrix (With Review on Properties of Fibre Reinforced and High-Strength Concrete) [R] . Nielsen, C. V. 1995

机译：超高强度钢纤维混凝土。第1部分。压缩基体的基本强度性能（综述了纤维增强和高强混凝土的性能）

EFFECT OF WATER PRESSURE ON CONCRETE STRENGTH

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