硫酸盐侵蚀作用下再生混凝土耐久性研究  

Study on durability of recycled concrete under sulfate attack

作　　者：付腾欢 王瑞骏[1] 何晓莹 陶喆 马利平 FU Tenghuan;WANG Ruijun;HE Xiaoying;TAO Zhe;MA Liping(Faculty of Water Resources and Hydro-electric Engineering,Xi＇an University of Technology,Xi＇an 710048,China)

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《水资源与水工程学报》2018年第3期194-199,共6页Journal of Water Resources and Water Engineering

基　　金：陕西省教育厅重点实验室科研计划项目(17JS092)

摘　　要：为了研究不同再生粗骨料(RCA)取代率在干湿循环条件下对再生混凝土抗硫酸盐侵蚀性能的影响,设计了再生粗骨料取代率为0、20%、50%与100%的4组配合比,分别检测混凝土质量损失率、相对动弹模量和剩余抗压强度。同时采用电子显微镜扫描(SEM)和EDS技术,对硫酸盐侵蚀后再生混凝土微观结构变化及生成产物进行了分析。结果表明:在硫酸盐侵蚀过程中,再生骨料掺量是影响再生混凝土质量损失率、相对动弹模量和剩余抗压强度的重要因素。随着再生粗骨料的增加,再生混凝土经过硫酸盐侵蚀以后质量损失率增大,剩余相对动弹模量减小,抗压强度降低。再生粗骨料的掺入会削弱混凝土抗硫酸盐侵蚀性能,掺量越大削弱效果越明显。Four groups of replacement ratios of recycled coarse aggregate（ 0%,20%,50% and 100%）were designed in order to study the effect of different replacement ratios of recycled coarse aggregate（ RCA） on the corrosion resistance of recycled concrete under dry and wet cycle conditions. And the mass loss rate,relative dynamic modulus and residual compressive strength of recycled coarse aggregate were measured respectively. At the same time,the microstructure changes and products of recycled concrete after sulfate attack were analyzed by SEM and EDS. The results show that the content of recycled aggregate is an important factor affecting the mass loss rate,relative dynamic modulus and residual compressive strength of recycled concrete. With the increase of recycled coarse aggregate,the mass loss rate of recycled concrete after sulfate attack increases,and the residual relative dynamic modulus decreases,and the compressive strength decreases. The addition of recycled coarse aggregate will weaken the anti-sulfate corrosion performance of concrete and the greater the amount of recycled coarse aggregate is added,the more obvious the effect will be.

关 键 词：再生混凝土 粗骨料取代率 硫酸盐侵蚀 混凝土耐久性 剩余抗压强度 显微镜扫描 混凝土微观变化 

分 类 号：TU528[建筑科学—建筑技术科学]