冻融循环下再生混凝土力学性能研究  

Study on mechanical properties of recycled concrete after freeze-thaw cycles

作　　者：戴俊[1] 翟惠慧 黄斌斌 薛贵堂 朱清耀 DAI Jun;ZHAI Huihui;HUANG Binbin;XUE Guitang;ZHU Qingyao(School of Architectural and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《混凝土》2022年第5期61-64,68,共5页Concrete

基　　金：国家自然科学基金资助项目(51174159);陕西省教育厅专项科学研究项目基金(15JK1471)。

摘　　要：为探究冻融循环作用对再生混凝土力学性能影响,以再生粗骨料取代率为变量,对冻融循环后再生混凝土质量及弹性模量进行研究,通过劈裂试验和静力抗压试验,综合评价冻融循环后再生混凝土的力学性能。结果表明:再生混凝土质量损失率、弹性模量损失率随冻融循环次数的增加逐渐增加;经50次冻融循环后,再生混凝土的受拉强度和受压强度较未冻融时偏低,且随再生粗骨料取代率的增加而呈现先减少后增大的趋势,当再生粗骨料取代率为50%时抗拉及抗压强度最低。In order to explore the effect of freeze-thaw cycle on the mechanical properties of recycled concrete,the quality and elastic modulus of recycled concrete after freeze-thaw cycle were studied by taking the replacement rate of recycled coarse aggregate as variable.The mechanical properties of recycled concrete after freeze-thaw cycle were comprehensively evaluated by the splitting test and static compressive test in Brazil.The results show that the mass loss rate and elastic modulus loss rate of recycled concrete increase gradually with the increase of freeze-thaw cycles.After 50 times of freeze-thaw cycles,the tensile strength and compressive strength of recycled concrete are lower than those without freeze-thaw cycles,and decrease first and then increase with the increase of the replacement rate of recycled coarse aggregate.When the replacement rate of recycled coarse aggregate is 50%,the tensile strength and compressive strength are the lowest.

关 键 词：再生混凝土 冻融循环 力学性能 取代率 

分 类 号：TU528.01[建筑科学—建筑技术科学]