外掺氧化镁碾压混凝土抗冻性能试验研究  

Experimental Research on Frost-resistance of Concrete with Adding of MgO

作　　者：李鹏辉[1] 许维[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《混凝土与水泥制品》2003年第3期15-17,共3页China Concrete and Cement Products

基　　金：清华大学"985"重点项目 (082100100)

摘　　要：以高寒地区某拱坝全断面外掺氧化镁的碾压混凝土为背景 ,研究了外掺氧化镁碾压混凝土的抗冻性能 ,分析了不同氧化镁掺量对碾压混凝土的抗冻性能的影响规律 ,并研究了养护期间的温度变化对混凝土抗冻性能的影响。试验结果表明 ,外掺氧化镁会降低碾压混凝土的抗冻性能 ;但使用DH9高效引气剂后 ,外掺氧化镁的C20碾压混凝土抗冻标号可达D300,满足工程要求 ;混凝土养护初期 ,高温和低温都会对其抗冻性能造成损害。The frost-resistance of Rcc(Roller Compacted Concrete)with adding MgO has been investigated with an engineering backgound of a certain RCC Arch Dam in cold area.The influence of temperature change on the frost-resistance of RCC during the curing period has also been researched.The test results showthat the frost-resistance ability of RCC reduces when the content of MgO increases,while the concrete with ability to resisting of quick freezing-thawing up to300cycles can be obtained by adding air entraining agent.The frost-resistance ability of RCC decreases when its curing temperature is up to40℃or down to0℃.

关 键 词：氧化镁 碾压混凝土 抗冻性 相对动弹模 养护 拱坝 

分 类 号：TV431[水利工程—水工结构工程]