补偿收缩混凝土在导流洞封堵工程中的应用  

Application of Shrinkage-compensating Concrete in Diversion Tunnel Closure Project

作　　者：张守治 田倩 郭飞[2] 

机构地区：[1]高性能土木工程材料国家重点实验室,江苏南京210008 [2]江苏博特新材料有限公司,江苏南京210008

出　　处：《施工技术》2013年第24期45-47,70,共4页Construction Technology

基　　金：国家"十二五"科技支撑课题:MgO膨胀剂和低收缩高镁水泥的制备及其在大型水电工程中的应用(2011BAE27B01-2)

摘　　要：根据导流洞封堵混凝土设计和施工要求,提出了下部采用常态微膨胀混凝土、中部采用泵送补偿收缩混凝土、顶部采用自密实膨胀混凝土的技术方案。系统研究了3种混凝土的新拌性能、力学性能、热学性能、抗渗性能、抗冻性能,重点研究了泵送混凝土的自生体积变形性能和徐变性能。结果表明,采用氧化镁复合膨胀剂配制常态微膨胀混凝土、泵送补偿收缩混凝土和自密实膨胀混凝土完全满足瀑布沟导流洞封堵混凝土工作性能、力学性能及耐久性要求。According to the design and construction requirements of the diversion tunnel closure concrete, the construction scheme is proposed, which is pouring the normal concrete at the lower part, the pumping shrinkage-compensating concrete at the central part, the self-compacting concrete at the top part of the diversion tunnel. A series of properties for the three types of concrete are introduced including fresh performance, mechanical properties, thermal properties, impermeability and frost resistance. The autogenous volume deformation and creep performance of pumping concrete are chiefly researched. The experiment results show that the normal concrete and pumping concrete and self-compacting concrete with Mg0 composite expansive agent can meet the blocking requirements of workability, mechanical properties and durability.

关 键 词：混凝土 膨胀剂 导流洞 封堵 应用 

分 类 号：TU528[建筑科学—建筑技术科学]