Critical vapour pressure for explosive spalling of high-strength concretebased on Mohr-Coulomb criterion

KANG Yaming; JIA Yan; LUO Yucai; CHEN Jingbo

doi:10.11883/bzycj-2016-0305

Volume 38 Issue 1

Nov. 2017

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KANG Yaming, JIA Yan, LUO Yucai, CHEN Jingbo. Critical vapour pressure for explosive spalling of high-strength concretebased on Mohr-Coulomb criterion[J]. Explosion And Shock Waves, 2018, 38(1): 224-232. doi: 10.11883/bzycj-2016-0305

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Critical vapour pressure for explosive spalling of high-strength concretebased on Mohr-Coulomb criterion

doi: 10.11883/bzycj-2016-0305

1.
School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, Ningxia, China
2.
School of Mathematics and Information Science, North Minzu University, Yinchuan 750021, Ningxia, China
3.
Ningxia Xu Ri Zhong Li Environmental Protection Technology Co., LTD, Yinchuan 750200, Ningxia, China

Received Date: 2016-10-17
Rev Recd Date: 2017-03-08
Publish Date: 2018-01-25

Abstract

Abstract

The explosive spalling probability of high-strength concrete will increase with the increase of water content, which shows that the vapour pressure is one of the main factors causing the explosive spalling, and this pressure affects the strength through changing the effective stress. To determine the effect of vapour pressure on strength quantitatively, a formula of critical vapour pressure was obtained on the basis of the principle of effective stress and Mohr-Coulomb criterion, and its logical rigor was proved from the aspect of mathematics. The main conclusions are as follows. (1) The theoretical formula has a clear physical meaning, and has a good consistency with the existing research results and the practical engineering disaster. (2) The influences of material physical properties on the crack cannot be fully considered in theoretical analyses, so the mechanical tests of concrete at extreme high temperature are the bases for determining the relevant coefficients of theory analysis. (3) Fire accidents should be investigated on the spot. Meanwhile, the destruction form and characteristics of different parts of the building should be analyzed after the fire. On the basis of these, the mechanism is clarified from the two aspects of the stress state and the ultimate failure characteristic of the component. Finally, the deficiencies were improved in theoretical analysis.
- high-strength concrete,
- high-temperature explosive spalling,
- effective stress,
- critical vapour pressure,
- Mohr-Coulomb criterion,
- temperature stress

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