骨料粒径对混凝土界面过渡区弹性模量与黏结强度影响预测

发布时间：2018-06-14 10:09

本文选题：界面过渡区 + 随机骨料　；参考：《混凝土》2017年07期

【摘要】：由于弹性模量和强度是混凝土力学性能重要指标,而界面过渡区又是混凝土材料组成中的重要一相,因此对界面过渡区的弹性模量和黏结强度的研究十分必要。基于随机骨料模型,根据混凝土试件的真实配合比,计算出各骨料粒径区间的面积含量,对骨料颗粒进行随机投放,分别建立了骨料最大粒径20、40、60、80 mm的凸多边形随机骨料细观模型,以砂浆和混凝土的弹性模量和抗压强度实测值为依据,采用反演法确定界面过渡区的力学参数。数值分析的结果表明:骨料粒径对界面过渡区黏结强度有很大影响,随着骨料粒径的增大,其黏结强度逐渐减小;界面弹性模量随着骨料粒径增加变化很小。
[Abstract]:Because the elastic modulus and strength are important indexes of concrete mechanical properties and the interfacial transition zone is an important phase in the composition of concrete, it is necessary to study the elastic modulus and bond strength of the interfacial transition zone. Based on the random aggregate model and the real mix ratio of concrete specimen, the area content of each aggregate particle size interval is calculated, and the aggregate particle is placed randomly. Based on the measured values of elastic modulus and compressive strength of mortar and concrete, the mechanical parameters of the interfacial transition zone are determined by inversion method based on the mesoscopic model of random polygon aggregate with the maximum aggregate diameter of 2040 / 6080mm and taking the measured values of elastic modulus and compressive strength of mortar and concrete as the basis. The results of numerical analysis show that the aggregate particle size has a great influence on the bond strength in the interfacial transition zone, and the bond strength decreases with the increase of the aggregate particle size, and the interfacial elastic modulus changes little with the increase of the aggregate particle size.
【作者单位】：西北农林科技大学水利与建筑工程学院;
【基金】：十二五国家科技支撑计划(2015BAD24B02) 十三五国家重点研发计划(2016YFC0400203)
【分类号】：TU528

【参考文献】