外掺氧化镁膨胀剂对水工混凝土安定性的影响研究  

Effects of Additive Magnesia Expansive Agents on Stability of Hydraulic Concrete

作　　者：陈焕超 陈思坚 薛乔文 肖棋琨 梁东 CHEN Huanchao;CHEN Sijian;XUE Qiaowen;XIAO Qikun;LIANG Dong(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong Provincial Research Center on Water Conservancy New Materials and Structural Engineering,Guangzhou 510635,China)

机构地区：[1]广东省水利水电科学研究院,广州510635 [2]广东省水利新材料与结构工程技术研究中心,广州510635

出　　处：《广东水利水电》2023年第11期21-24,共4页Guangdong Water Resources and Hydropower

基　　金：2021年度广州市水务科技项目。

摘　　要：通过膨胀率以及劈裂抗拉强度研究了不同掺量氧化镁膨胀剂对水工混凝土安定性的影响,并通过绝热温升试验研究了氧化镁膨胀剂与不同强度等级混凝土的匹配性。结果表明:氧化镁掺量以及混凝土龄期的增加会使混凝土的膨胀率逐渐增加。当氧化镁膨胀剂掺量在6%时,不同强度等级混凝土的劈裂抗拉强度比未发生变化,劈裂抗拉强度比均为1.05,混凝土的安定性最好。氧化镁膨胀剂具有良好的分散性,与不同强度等级的混凝土配合比有较好的匹配性。The influence of magnesia expansive agent with different dosages on the stability of hydraulic concrete was studied by expansion rate and tensile splitting strength,and the compatibility between magnesia expansive agent and concrete with different strength grades was researched by adiabatic temperature rise.The results showed that the expansion rate of concrete gradually increased with the increased dosage of magnesia expansive agent and the increased age of concrete.When the content of magnesia expansive agent was 6%,the splitting tensile strength ratio of concrete with different strength grades of were the same,and the splitting tensile strength ratio were all 1.05,indicating concrete had the best stability with the content of 6%.Magnesia expansive agent had good dispersibility and good compatibility with concrete mix proportions of different strength levels.

关 键 词：氧化镁膨胀剂 掺量 水工混凝土 安定性 

分 类 号：TV431[水利工程—水工结构工程]