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保温混凝土细观模型建立及导热系数分析
作者：王绎景1，秦渊2，王文婧1，李珠1
（1.太原理工大学 土木与建筑工程学院，山西 太原 030024；
2.阳光凯迪新能源集团有限公司，湖北 武汉 430223）
摘要：研究建立了针对含有大量玻化微珠颗粒的二维保温混凝土细观模型，给出了一种基于图片数字化处理方法的背景网格划分方法，有效克服了由于模型尺寸小、数量大等因素造成的有限元网格划分困难的问题。采用该模型进行保温混凝土导热系数数值模拟，并与试验数据相比较，验证了模型的有效性，且误差较小。对3种不同粗骨料形状的保温混凝土的导热系数进行了模拟分析，结果表明，粗骨料形状对保温混凝土的导热系数影响不大。
关键词：保温混凝土；细观模型；背景网格；图片数字化处理；导热系数
中图分类号：TU55+1.31 文献标识码：A 文章编号：1001702X（2018）11-0067-06
Meso-model establishment and thermal conductivity analysis of thermal insulation concrete
WANG Yijing1，QIN Yuan2，WANG Wenjing1，LI Zhu1
（1.College of Architecture and Civil Engineering，Taiyuan University of Technology，Taiyuan 030024，China；
2.Sunshine KAIDI New Energy Group Co. Ltd.，Wuhan 430223，China）
Abstract：In this study，a background-grid method based on digital image processing method is proposed for thermal insulation concrete（TIC） containing a large number of glazed hollow bead. This method can effectively overcome the problem of limited
element mesh generation caused by the factors of small model size and large number and a 2-D meso-scale model of TIC is established. The thermal conductivity of the TIC was numerically simulated，and the numerical results were compared with the experimental data to verify the effectiveness of the model and the error is small. Finally，the thermal conductivity of TIC with three different shapes of coarse aggregate is simulated and analyzed. The results show that the shape of coarse aggregate has little effect on the thermal conductivity of thermal insulation concrete.
Key words：thermal insulation concrete，meso-scale model，background-grid，digital image processing，thermal conductivity