大体积混凝土板式结构裂缝控制应用技术研究

Research on application of crack control technology for mass concrete slab structure

以某医院直线加速器混凝土顶板为研究对象,采用补偿收缩混凝土技术和水平分层间歇法相结合的方法,同时跟进混凝土施工过程控制,研究了大体积混凝土板式结构在施工过程中温度应变情况和应用效果。结果表明:采用水平分层间歇法施工且间歇7 d,有效降低混凝土结构内部温度;同时,辅以保温保湿措施,MgO膨胀剂可补偿混凝土的温降收缩和干燥收缩,有效降低混凝土结构因收缩出现裂缝的风险。

Taking the linear accelerator top slab of a hospital as the research object,combined with shrinkage-compensating concrete technology and horizontal layered intermittent construction,followed up the concrete construction process control,the temperature,strain and application effectwas measured during the construction of a mass concrete slab structure.The results showed that the horizontal layered intermittent construction was used with an interval of 7 days,which can effectively reduce the internal temperature of the concrete structure;simultaneously,MgO expansive agent was effectively compensate for temperature drop shrinkage and drying shrinkage supplemented by heat preservation and moisture retention measure,effectively reducing the risk of cracks in concrete structures due to shrinkage.