水利学报2017，Vol.48Issue(6)：689-701,13.DOI:10.13243/j.cnki.slxb.20160768
开裂混凝土有效导热系数研究:三维模拟与试验验证
Study of effective thermal conductivity of cracked concrete:three-dimensional simulation and experimental validation
摘要
Abstract
A mesoscopic numerical method is proposed to investigate the effective thermal conductivity (ETC) of both tensile and compressive cracked concrete,and this method is applied to obtain the quantitative relationships between tensile or compressive strain and ETC,respectively.The main conclusions are drawn as follows:(a) for tensile dominated failure,concrete ETC decreases by 23％ during plastic stage whereas a very slight linear decrease is found at complete failure;(b) for compressive dominated failure,ETC decreases by 30％ during earlier plastic stage,and then becomes steady afterwards.In the softening stage,ETC linearly decreases with the increase of compressive strain;(c) it is the interfacial thermal resistance induced by the micro-cracks between aggregates and mortar rather than the macro-cracks that play the dominant role in this phenomenon;(d) concrete ETC shows more anisotropy when cracks appear.Then an experimental validation of compressive cracked concrete's ETC vertical to cracks (C-ETCV) shows that C-ETCV decreases by 20％ ～ 25％ at earlier plastic stage and then becomes steady at later plastic stage.The numerical results obtained simulations are used to determine the interfacial thermal resistance factor in Wang model.A good agreement between the data from simulation,Wang model and experiment indicates the correctness of this study.关键词
开裂混凝土/有效导热系数/细观模拟/试验/王家俊模型Key words
cracked concrete/effective thermal conductivity/meso-scale simulation/experiment/Wang model分类
建筑与水利引用本文复制引用
沈雷,任青文,张林飞,韩衍..开裂混凝土有效导热系数研究:三维模拟与试验验证[J].水利学报,2017,48(6):689-701,13.基金项目
国家自然科学基金项目(11132003) （11132003）
河海大学中央高校基本科研业务费项目(2013/B15020334) （2013/B15020334）
