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首页> 外文期刊>International Journal of Heat and Mass Transfer >A thermal cracking pattern-based multiscale homogenization method for effective thermal conductivity of steel fiber reinforced concrete after high temperature
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A thermal cracking pattern-based multiscale homogenization method for effective thermal conductivity of steel fiber reinforced concrete after high temperature

机译：高温钢纤维钢筋混凝土有效导热率的热裂纹图案均质均质方法

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摘要

The mesoscopic thermal cracking behavior in steel fiber reinforced concrete (SFRC) caused by high-temperature load can result in a substantial reduction of effective thermal conductivity (ETC) at macroscale level. In this study, a multiscale homogenization method for identifying the ETC of thermally damaged SFRC is proposed. This new method is characterized by the consideration of crack thermal resistance effect rather than using temperature-dependent thermal conductivities of components in cemen-titious composite. A series of experiments on thermal conductivity of mortar, plain concrete, and SFRC heated at various temperatures is performed. The method predictions satisfy the experimental results extremely well when the interfacial thermal resistance (ITR) coefficient is assumed to increase linearly with temperature. The numerical and experimental results show that the ITR effect makes approximately 50%, 36%, and 7%-12% contributions to the overall thermal conductivity reductions in the mortar, plain concrete, and SFRC heated up to 600 °C, respectively. Moreover, it is found that the trend and magnitude of ETC reduction caused by heating increase with the increase in particle content and particle-matrix thermal conductivity ratio due to the synergistic effect of heat bridge and ITR.
机译：由高温负荷引起的钢纤维增强混凝土（SFRC）中的介于思科热裂化行为可导致Macroscale水平的有效导热性（ETC）的大幅降低。在该研究中，提出了一种用于识别热损伤SFRC等等的多尺度均化方法。这种新方法的特征在于考虑裂纹热阻效应，而不是在CEMEN - 致各种复合材料中使用组分的温度依赖性导热性。进行了一系列关于砂浆，普通混凝土和SFRC在各种温度下加热的热电导的实验。当假定界面热阻（ITR）系数以温度线性增加时，方法预测满足实验结果非常好。数值和实验结果表明，ITR效应分别为砂浆，普通混凝土和SFRC的整体导热率降低约50％，36％和7％-12％贡献，分别加热至600°C。此外，发现由于热桥和ITR的协同效应，通过加热增加，通过加热增加等等等等等幅度。

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