点击次数：

发表时间：2022-10-06

发表刊物：建筑材料学报

期号：6

页面范围：643-649

ISSN号：1007-9629

摘要：Digital image processing methods were employed to characterize the three-phase microstructures of concrete consisting of mortar matrix,coarse aggregate and interfacial transition zone(ITZ).The distri-bution and shape of ITZ were obtained digitally.The characterized microstructure was incorporated into material failure process analysis(MFPA~(2D)) system,and the numerical model of concrete was established which took into account the real heterogeneity of concrete.The influence of tensile strength of ITZ on ten-sile fracturing process was studied using this model according to a surface image of concrete with certain proportioning.The results show that if the tensile strength of ITZ is low,in the fracturing process of con-crete the microcracks initiated in ITZ interact with each other,then propagate and coalesce.With the ten-sile strength of ITZ increasing,fractured modes of concrete under uniaxial tensile loading transit from sin-gle coalescent crack to multiple non-coalescent cracks and the ductility of concrete is enhanced.The rela-tion between the tensile strength of ITZ and that of concrete is non-linear.The simulation results agree well with experimental results.

备注：新增回溯数据