利用砖混建筑废弃物制备再生混凝土的性能研究  

Research on Properties of Recycled Concrete Prepared with Brick and Concrete Construction Waste

作　　者：张献蒙 刘旭 柏彬 彭千 冀韦伊 ZHANG Xianmeng;LIU Xu;BAI Bin;PENG Qian;JI Weiyi(State Grid Jiangsu Electric Power Engineering Consulting Co.,Ltd.,Nanjing 210008,China;College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]国网江苏省电力工程咨询有限公司,南京210008 [2]南京航空航天大学民航学院,南京210016

出　　处：《硅酸盐通报》2021年第8期2680-2686,共7页Bulletin of the Chinese Ceramic Society

基　　金：国网江苏省电力工程咨询有限公司2020年自主科技项目(J202008)。

摘　　要：由砖混建筑废弃物制备的再生粗骨料通常含有部分碎砖粗骨料。为研究碎砖含量对混凝土性能的影响,将再生混凝土粗骨料和碎砖粗骨料按不同比例(体积分数)混合制备混合型再生粗骨料,并以30%的取代率取代天然骨料浇筑混凝土试块进行试验研究。研究结果表明:混凝土破坏时,天然粗骨料沿粗骨料与砂浆之间的界面过渡区断裂失效,而碎砖粗骨料则是贯穿粗骨料内部断裂失效;当碎砖含量不超过18%时,对混凝土抗压强度和抗氯离子渗透性能没有明显影响,碎砖含量超过18%时,抗压强度和抗氯离子渗透性明显下降;碎砖含量越大,混凝土抗盐冻能力越差;当砖含量不变时,水灰比越高,再生碎砖粗骨料对混凝土抗压强度的不利影响越小。Recycled coarse aggregate prepared from brick and concrete construction waste usually contains part of the brick aggregate.In order to study the failure mode and the influence of brick content on the properties of mixed recycled coarse aggregate concrete,the recycled concrete aggregate and brick aggregate were mixed in various proportions(volume fraction)to prepare mixed recycled aggregate,and the natural aggregate was replaced by mixed recycled aggregate in 30% to produce concrete specimens for test.The experimental results indicate that the natural aggregate in mixed recycled aggregate concrete fails along the interface transition zone between the aggregate and the mortar,while the recycled brick coarse aggregate is fractured through the aggregate.When the brick content is less than 18%,there is no obvious effect on compressive strength and resistance of chloride penetration,and once the brick content is more than 18%,compressive strength and resistance of chloride penetration decrease obviously.The higher the content of brick is,the worse the salt frost resistance of concrete is.When the brick content is constant,the higher the water cement ratio is,the smaller the adverse effect of recycled brick coarse aggregate on the compressive strength of concrete.

关 键 词：混合型再生粗骨料 混凝土 抗氯离子渗透 立方体抗压强度 抗盐冻性能 

分 类 号：TU375.1[建筑科学—结构工程]