聚合物乳液对自密实混凝土性能的影响  

Effect of Polymer Emulsion on Properties of Self⁃compacting Concrete

作　　者：郑永杰 杨鲁 王浩 谭盐宾 李林香 齐婧 岳成军 ZHENG Yongjie;YANG Lu;WANG Hao;TAN Yanbin;LI Linxiang;QI Jing;YUE Chengjun(Railway Engineering Research Institute,CARS,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,CARS,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国铁道科学研究院集团有限公司高速铁路轨道系统全国重点实验室,北京100081

出　　处：《铁道建筑》2024年第1期136-139,共4页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2020YJ192)。

摘　　要：研究了乙烯-醋酸乙烯共聚乳液、苯丙乳液和丁苯乳液对自密实混凝土工作性能、静态稳定性、力学性能和体积稳定性的影响。结果表明:三种聚合物乳液均可增加自密实混凝土扩展时间T500,降低自密实混凝土J环障碍高差、贯入度和干燥收缩率,显著提高自密实混凝土黏结强度,且均可满足Q/CR 659—2018《高速铁路混凝土结构用修补砂浆》中28 d龄期黏结强度大于2.0 MPa的要求,但会不同程度降低自密实混凝土抗压强度,其中掺入乙烯-醋酸乙烯共聚乳液的自密实混凝土抗压强度降幅最小,且其强度可达到C55混凝土强度要求,因此该自密实混凝土可用于钢管混凝土拱桥拱肋脱空修补。The effects of ethylene-vinyl acetate copolymer emulsion,styrene-acrylic emulsion and styrene-butadiene rubber emulsion on the workability,static stability,mechanical properties and volume stability of self-compacting concrete were studied.The results shows that all three polymer emulsion can increase the expansion time T500 of self-compacting concrete,reduce the height difference of J ring barrier,penetration and drying shrinkage rate of self-compacting concrete,and significantly improve the bond strength of self-compacting concrete.It can also meet the requirement of 28 d bonding strength greater than 2.0 MPa in Repair Mortar for Concrete Structure of High speed Railway(Q/CR 659—2018),but it will reduce the compressive strength of self-compacting concrete to varying degrees.The self-compacting concrete mixed with ethylene-vinyl acetate copolymer emulsion has the smallest reduction in compressive strength,and its strength can meet the strength requirements of C55 concrete,Therefore,this self-compacting concrete can be used for repairing the void in the arch ribs of steel tube concrete arch bridges.

关 键 词：工程材料 聚合物乳液 试验研究 自密实混凝土 贯入度 抗压强度 黏结强度 干燥收缩率 

分 类 号：U214.18[交通运输工程—道路与铁道工程] TU528[建筑科学—建筑技术科学]