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Characterisation of temperature-dependent heat conduction in heterogeneous concrete

机译：非均质混凝土中随温度变化的导热特性

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摘要

Considering the heterogeneity, a mesoscopic simulation method was developed to analyse the heat conduction behaviour of heterogeneous concretes. In the numerical homogenisation technique, the concrete was regarded as a heterogeneous material consisting of three components (aggregate, mortar matrix and interfacial transition zones (ITZs)). Both two-and three-dimensional random aggregate structures of concrete were established. The temperature-dependent thermal properties of the mortar and aggregate were obtained based on experimental data from the literature, and those of the ITZ were determined by comparing the simulation results with measured values. The heat conduction equations were solved using the finite-element method: the three components were meshed separately and continuity of the heat fluxes at interfaces was applied. Good agreement was found between the simulation results and available test observations. The simulation results indicate that both the effective thermal conductivity (ETC) and a more accurate temperature field of concrete can be obtained using this mesoscale simulation method considering the temperature dependency of the materials' thermal properties. Aggregate shape was found to have a negligible influence on the ETC of concrete, but the type of aggregate cannot be ignored due to their different thermal conductivities. The ETC of concrete increased with increasing aggregate content and decreased with increasing temperature.
机译：考虑到异质性，发展了一种介观模拟方法来分析异质混凝土的导热性能。在数值均质化技术中，混凝土被视为由三种成分（骨料，砂浆基质和界面过渡区（ITZ））组成的异质材料。建立了二维和三维随机混凝土结构。根据文献的实验数据获得了灰浆和骨料的温度相关的热性能，通过将模拟结果与测量值进行比较，确定了ITZ的热性能。使用有限元法求解热传导方程：将这三个分量分别划分网格，并应用界面处的热通量连续性。在仿真结果和可用的测试观察结果之间找到了很好的一致性。仿真结果表明，考虑到材料热性能的温度依赖性，使用这种中尺度仿真方法可以同时获得混凝土的有效热导率（ETC）和更精确的温度场。发现骨料形状对混凝土的ETC的影响可以忽略不计，但是由于骨料的导热系数不同，因此不能忽略骨料的类型。混凝土的ETC随骨料含量的增加而增加，而随温度的升高而下降。

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  • 来源
    《Magazine of Concrete Research》 |2018年第8期|325-339|共15页
  • 作者

    Jin Liu; Zhang Renbo; Du Xiuli;

  • 作者单位

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China;

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China;

    Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China;

  • 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
  • 关键词

    finite element methods; plain concrete; temperature-related thermal effects;

    机译：有限元方法;普通混凝土;温度相关和热效应;

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