粗骨料随机分布对混凝土导热性能的影响

发布时间：2018-06-18 17:51

本文选题：混凝土 + 导热性能　；参考：《建筑材料学报》2017年02期

【摘要】：采用COMSOL与MATLAB联合仿真的方法,基于混凝土二维细观几何模型,实现了混凝土稳态热传导的数值模拟.在利用试验结果验证数值模拟有效性的基础上,分析了骨料随机分布对混凝土导热性能的影响,并讨论了粗骨料粒径、形状及其体积分数,以及分散相导热系数对混凝土导热性能的影响规律.结果表明:粗骨料随机分布是造成混凝土导热性能产生随机性的重要因素;混凝土导热系数相对平均值随着粗骨料体积分数、分散相导热系数的增加而增大,但受粗骨料粒径和形状的影响不大;粗骨料体积分数越高,分散相与水泥砂浆导热系数相差越大,粗骨料粒径越大,轴长比越大,混凝土导热系数的变异性越显著,但当粗骨料体积分数超过35%后混凝土导热系数的变异性基本保持不变.
[Abstract]:The numerical simulation of steady state heat transfer of concrete is realized based on the two-dimensional mesoscopic geometry model of concrete by the combined simulation of COMSOL and MATLAB. Based on the validity of numerical simulation, the influence of random distribution of aggregate on the thermal conductivity of concrete is analyzed, and the particle size, shape and volume fraction of coarse aggregate are discussed. And the influence of thermal conductivity of dispersed phase on the thermal conductivity of concrete. The results show that the random distribution of coarse aggregate is an important factor for the randomness of thermal conductivity of concrete, and the relative average value of thermal conductivity of concrete increases with the increase of the volume fraction of coarse aggregate and the thermal conductivity of dispersed phase. The higher the volume fraction of coarse aggregate, the greater the thermal conductivity of dispersed phase and cement mortar, the larger the diameter of coarse aggregate and the greater the axial length ratio, the more the variability of thermal conductivity of concrete is. But when the integral number of coarse aggregate is more than 35%, the variation of thermal conductivity of concrete remains basically unchanged.
【作者单位】：同济大学建筑工程系;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB655103)
【分类号】：TU528.01

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