Numerical calculations of vapour pressure in concrete exposed to fire

C. Qian; H. Wang; W. Sun; Z. Guo; P. Stroeven

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Numerical calculations of vapour pressure in concrete exposed to fire

机译：火灾混凝土中蒸气压的数值计算

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According to the diffusion equation and the hypothetical relationship between vapour pressure, moisture density and temperature, a differential file method is used to calculate the inner vapour pressure of concrete at high temperatures. When concrete is heated, a distribution field of vapour pressure will be formed. If the temperature changes, the value and the location of the peak pressure in concrete will change. However, the temperature at which the peak pressure is obtained is nearly the same, ranging from 220℃ to 240℃. Calculation results show that the vapour pressure reaches peak values at a distance of less than 10mm from the heating surface when the heating time is not more than 1 h according to the ISO 834 heating regime. The peak pressure values are from 1 MPa to 2 MPa depending on heating time. Some explanations about concrete spoiling are given, which indicate that vapour pressure is the main reason for the spoiling of concrete.

机译：根据扩散方程以及蒸气压，水分密度和温度之间的假设关系，采用微分文件法计算高温下混凝土的内部蒸气压。当加热混凝土时，将形成蒸气压的分布场。如果温度发生变化，则混凝土中峰值压力的值和位置将发生变化。但是，获得峰值压力的温度几乎相同，范围为220℃至240℃。计算结果表明，根据ISO 834加热方案，当加热时间不超过1 h时，蒸汽压力在距加热表面不到10mm的距离处达到峰值。取决于加热时间，峰值压力值为1 MPa至2 MPa。给出了一些关于混凝土变质的解释，表明蒸气压是造成混凝土变质的主要原因。

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来源
《Magazine of Concrete Research》 |2005年第3期|p.179-184|共6页
作者
C. Qian; H. Wang; W. Sun; Z. Guo; P. Stroeven;
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作者单位

Department of Materials Science and Engineering, Southeast University, Nanjing 210096, P.R. China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类水泥工业;
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机译：对暴露于碳氢化合物火中的试样尺寸，原位孔隙压力和温度对不同尺寸混凝土板剥落的影响进行实验研究
2. A numerical investigation of the influence of pore pressures and thermally induced stresses for spalling of concrete exposed to elevated temperatures [J] . H.L. Zhang, C.T. Davie Fire Safety Journal . 2013,第jula期

机译：孔隙压力和热应力对高温下混凝土剥落影响的数值研究
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机译：数值模拟暴露在火中的混凝土墙的行为
5. FINITE ELEMENT ANALYSIS OF FIRE-EXPOSED REINFORCED CONCRETE COLUMN (REINFORCED CONCRETE). [D] . KISHYSH, KADHUM OTHMAN. 1986

机译：火灾后钢筋混凝土柱（钢筋混凝土）的有限元分析。
6. Calculation of the Vapour Pressure of Organic Molecules by Means of a Group-Additivity Method and Their Resultant Gibbs Free Energy and Entropy of Vaporization at 298.15 K [O] . Rudolf Naef, William E. Acree Jr. 2021

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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。

Numerical calculations of vapour pressure in concrete exposed to fire

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