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    唐世斌

    • 教授     博士生导师   硕士生导师
    • 性别:男
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:土木工程系
    • 学科:岩土工程. 计算力学. 桥梁与隧道工程. 水工结构工程
    • 电子邮箱:tang_shibin@dlut.edu.cn

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    Numerical Study of the Influence of Material Structure on Effective Thermal Conductivity of Concrete

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    论文类型:期刊论文

    发表时间:2012-06-01

    发表刊物:HEAT TRANSFER ENGINEERING

    收录刊物:SCIE、EI

    卷号:33

    期号:8

    页面范围:732-747

    ISSN号:0145-7632

    摘要:A two-dimensional numerical model is presented to examine meso- and macroscopic structure effects on the effective thermal conductivity of concrete. The heterogeneity of concrete is considered at a mesoscopic level by Weibull distribution assumption. Simulations on several heterogeneous samples show that the effective thermal conductivity strongly depends on the degree of heterogeneity. Higher homogeneity indicates a greater effect on the effective thermal conductivity. Numerically simulated results also indicate that the size and shape of individual coarse aggregate appear to have negligible influence on the effective thermal conductivity of concrete. However, that greatly depends on the thermal conductivity and volume fraction of coarse aggregate. Modeling suggests that heat conductivity decreases when there is a drop in strength due to the damages creating a thermal barrier across the cracks and thus preventing heat flow through the matrix, that is, resulting in reduction of effective thermal conductivity. Moreover, the formation of cracks in the interfacial transition zone also leads to significant reduction of heat flow in coarse aggregates.