城市地下空间环路大体积混凝土侧墙裂缝控制研究
Research on Crack Control of Mass Concrete Side Wall of Urban Underground Space Loop
张登科 1王丙垒 2刘拼 2徐智丹2
作者信息
- 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
- 折叠
摘要
以武汉市某地下空间环路工程侧墙为研究对象,探究大体积混凝土施工过程中的体积变形和温度变化情况.结果表明:内掺5.4%M型MgO膨胀剂(等量取代粉煤灰)配制强度等级为C40 的补偿收缩混凝土,采取有效保温保湿养护措施,可以在大体积混凝土结构内部产生一定微膨胀,补偿混凝土的内部收缩,有效降低混凝土收缩开裂风险.
Abstract
Taking the side wall of an underground space loop project in Wuhan City as the research object,the volume deformation and temperature change of the shrinkage compensated concrete during the construction of mass concrete were investigated.Results show that:By adding 5.4%M type MgO expansion agent(replacing fly ash in equal amount),the concrete with strength class of C40 was prepared to compensate for shrinkage.By taking effective insulation and moisturizing maintenance measures,a certain micro expansion could be generated in the large volume concrete structure to compensate for the internal shrinkage of concrete and reduce the risk of concrete shrinkage cracking.
关键词
underground space loop project/MgO expansion agent/large volume structure/compensation shrinkage concrete/fracture controlKey words
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出版年
2024
NETL
NSTL
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