聚乙烯醇强化废砖再生骨料混凝土抗折强度研究  

Study on Flexural Strength of Polyvinyl Alcohol Reinforced Waste Brick Recycled Aggregate Concrete

作　　者：张少龙 罗煜杰 马荣凯 姜萌 肖永刚 白青青 Zhang Shaolong;Luo Yujie;Ma Rongkai

机构地区：[1]西安交通工程学院土木工程学院,陕西西安710300

出　　处：《江苏建材》2024年第3期61-63,共3页Jiangsu Building Materials

基　　金：西安交通工程学院校级中青年基金项目“基于聚合物改性再生骨料的混凝土性能试验研究”(项目编号:2023KY-37);西安交通工程学院大学生创新创业训练计划项目《聚合物改性再生骨料混凝土性能试验研究》(项目编号:2022DC06)。

摘　　要：采用聚乙烯醇溶液作为改性材料,使用浸泡法对人行道铺路砖废料进行改性并制备再生混凝土,研究了聚乙烯醇对废砖骨料的强化效果,以及聚乙烯醇浓度、再生骨料浸泡时间对再生混凝土抗折性能的影响。结果表明,经聚乙烯醇溶液强化后的再生骨料的吸水率随着聚乙烯醇溶液浓度的升高而降低,最大降低了16%,表观密度达到天然粗骨料的85%。用改性废砖作为粗骨料制备的再生混凝土,抗折强度随着聚乙烯醇溶液浓度的增加呈先上升后下降趋势,抗折强度与聚乙烯醇溶液的浸泡时间有关,浸泡5 min,抗折强度达到3.5 MPa;浸泡90 min,抗折强度可达3.69 MPa。The strengthening effect of polyvinyl alcohol on waste brick aggregate,and the effects of polyvinyl alcohol concentration and soaking time of recycled aggregate on the flexural properties of recycled concrete were studied by using polyvinyl alcohol solution as the modified material,and the soaking time of pavement paving bricks was modified by immersion method.The results showed that the water absorption rate of the recycled aggregate strengthened by polyvinyl alcohol solution decreased with the increase of the concentration of polyvinyl alcohol solution,with a maximum decrease of 16%,and the apparent density reached 85%of that of natural coarse aggregate.The flexural strength of recycled concrete prepared with modified waste bricks as coarse aggregate has a high tendencing trend with the increase of polyvinyl alcohol solution concentration,and the flexural strength is related to the soaking time of polyvinyl alcohol solution,which reaches 3.5 MPa after soaking for 5 min and 3.69 MPa after soaking time of 90 min.

关 键 词：再生混凝土 抗折强度 聚乙烯醇 强化 

分 类 号：TU502.6[建筑科学—建筑技术科学]