氧化镁膨胀剂在溪洛渡水电站导流洞封堵中的应用  

Application of Magnesium Oxide Expander in Closure of Diversion Tunnel of Xiluodu Hydropower Station

作　　者：闵强 徐可 纪宪坤 杨静 MIN Qiang;XU Ke;JI Xian-kun;YANG Jing(Wuhan Yuanjin Building Material Technology Co.,Ltd.,Wuhan 430083,China;Wuhan Sanyuan special building materials Co.,Ltd.,Wuhan 430083,China)

机构地区：[1]武汉源锦建材科技有限公司,湖北武汉430083 [2]武汉三源特种建材有限责任公司,湖北武汉430083

出　　处：《云南水力发电》2022年第11期41-44,共4页Yunnan Water Power

摘　　要：介绍了导流洞封堵混凝土的设计要求、施工程序及工艺,并通过掺加氧化镁膨胀剂配制补偿收缩混凝土来控制混凝土开裂,从而实现封堵混凝土与洞壁紧密结合。重点分析了掺加氧化镁膨胀剂的水工混凝土的温度和应力变化,结果表明:掺加氧化镁膨胀剂的水工混凝土可很好的补偿混凝土收缩,使混凝土处于微膨胀状态,从而与原衬砌洞壁充分挤压密切,对导流洞封堵施工具有一定的指导意义。The design requirements,construction procedure and technology of concrete blocking for diversion tunnel are introduced.Controlling concrete cracking by mixing shrinkage compensating concrete with magnesia expansion agent realizes close combination of blocking concrete and tunnel wall.The temperature and stress changes of hydraulic concrete with magnesia expansion agent are analyzed emphatically.The results show that the hydraulic concrete with magnesia expansion agent can compensate the shrinkage of concrete well and keep the concrete in a slightly expanded state,thus fully extruding the original lining wall,which has certain guiding significance for the closure construction of diversion tunnel.

关 键 词：氧化镁膨胀剂 导流洞 封堵 裂缝控制 监测数据分析 

分 类 号：TV551.12[水利工程—水利水电工程] TV49