再生砖骨料混凝土力学性能劣化规律试验研究  

Experimental research on the deterioration law of recycled brick aggregate concrete mechanical properties

作　　者：纪泳丞[1] 张弘锐 杜任杰 张小庆 李微 JI Yongcheng;ZHANG Hongrui;DU Renjie;ZHANG Xiaoqing;LI Wei(College of Civil Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040

出　　处：《中国测试》2022年第11期54-61,共8页China Measurement & Test

基　　金：2020年黑龙江省留学回国人员择优资助经费(415001)。

摘　　要：为研究再生砖骨料混凝土在不同掺量和不同冻融循环次数下的力学性能变化。通过以红砖粗骨料掺量,钢纤维掺量,冻融循环次数为变量进行试验,研究以上因素对再生砖骨料混凝土力学性能的影响,并通过有限元软件建立有限元模型进行拟合分析。试验结果表明:随着红砖骨料取代率的增加,混凝土试件的立方体抗压强度逐渐降低,且当钢纤维掺量为1%时,再生混凝土试件的立方体抗压强度提高最为显著。抗冻性能方面,随着冻融循环次数的增加,再生混凝土试件的质量损失逐渐提高,且抗压强度逐渐下降。当冻融循环次数在50次以上时,试件强度的降幅趋于平缓。This study investigates the mechanical properties of recycled brick aggregate concrete under different admixtures and freeze-thaw cycles.Through experiments with red brick coarse aggregate content,steel fiber content,and freeze-thaw cycle times as variables,the influence of the above factors on the mechanical properties of recycled brick aggregate concrete is studied,and a finite element model is established through finite element software for fitting analyze.The test results show that with the increase of the replacement rate of the red brick aggregate,the cubic compressive strength of the concrete specimens gradually decreases,and when the steel fiber content is 1%,the cubic compressive strength of the recycled concrete specimens increases most significantly.In terms of frost resistance,as the number of freeze-thaw cycles increases,the mass loss of recycled concrete specimens gradually increases,and the compressive strength decreases.However,when the number of freeze-thaw cycles is more than 50 times,the decrease in the strength of the specimen tends to be gentle.

关 键 词：再生砖骨料混凝土 抗压强度 冻融循环 有限元模型 

分 类 号：TU3[建筑科学—结构工程] TB9[一般工业技术—计量学]