砖混骨料再生混凝土冻融本构模型研究  

Research on freeze-thaw constitutive model of brick-concrete recycled concrete

作　　者：齐琳 张政 于保阳[2] QI Lin;ZHANG Zheng;YU Baoyang(Department of Civil Engineering,Shenyang Urban Construction College,Shenyang 110167,china;School of Traffic and Surveying Engineering,Shenyang Jianzhu University,Shenyang 110168,china)

机构地区：[1]沈阳城市建设学院土木工程学院,辽宁沈阳110167 [2]沈阳建筑大学交通与测绘工程学院,辽宁沈阳110168

出　　处：《混凝土》2023年第6期56-60,共5页Concrete

基　　金：国家自然科学基金面上项目(51978422);辽宁省教育厅一般项目(lnjc201916)。

摘　　要：针对再生骨料中砖块含量的变化在冻融循环作用下对再生混凝土的影响,通过对再生骨料中不同砖块含量的再生混凝土进行冻融循环试验后进行单轴抗压试验,分析冻融循环对再生骨料中不同砖块含量(0、10%、20%、30%)的再生混凝土峰值应变、峰值应力的影响。给出了再生混凝土的峰值应力、峰值应变随再生骨料中砖块含量和冻融循环次数变化的规律,并建立了考虑冻融循环次数及再生骨料中砖块含量双影响因素再生混凝土本构模型。再生混凝土会由于再生骨料中砖块含量增加导致其峰值应力降低、峰值应变增加。再生骨料中砖块含量越高,对再生混凝土抗冻性的影响越大,再生混凝土可以承受的最大冻融循环次数越小。The effect of freeze-thaw cycles on recycled concrete is investigated by conducting uniaxial compressive tests on recycled concrete with different brick contents in the recycled aggregate,and the effect of freeze-thaw cycles on the peak strain and peak stress of recycled concrete with different brick contents in the recycled aggregate(0,10%,20%and 30%)is analysed.The peak stress and peak strain of the recycled concrete are given as a function of the brick content in the recycled aggregate and the number of freeze-thaw cycles,and a principal structure model of the recycled concrete is developed,taking into account the double influence of the number of freeze-thaw cycles and the brick content in the recycled aggregate.The model is based on the fact that the increase in brick content in recycled aggregate leads to a decrease in peak stress and an increase in peak strain in recycled concrete.The higher the brick content in the recycled aggregate,the greater the effect on the frost resistance of the recycled concrete and the smaller the maximum number of freeze-thaw cycles that the recycled concrete can withstand.

关 键 词：建筑废料 砖混骨料再生混凝土 冻融循环 本构模型 

分 类 号：TU528.01[建筑科学—建筑技术科学]