基于实测资料的外掺MgO微膨胀混凝土变形性态研究

Study on deformation characteristics of micro expansion concrete mixed with MgO based on the measured data

外掺MgO混凝土产生的延迟性微膨胀能够补偿混凝土在温降过程中产生的收缩变形,从而防止或减少混凝土产生裂缝.本文通过对向家坝水电站导流底孔外掺氧化镁混凝土的室内试验和现场监测成果进行对比分析,探讨了外掺MgO与未掺MgO,同类混凝土中掺量不同对混凝土变形特性的影响.

MgO concrete has delayed micro expansion, which can compensate shrinkage deformation in the temperature reduction process, so as to prevent or reduce the concrete crack. Based on the comparative analysis about indoor test and field monitoring results of Xiangjiaba Hydropower Station Diversion Tunnel concrete mixed with MgO, compared with MgO and without MgO doped, the similar concrete mixed with different MgO admixture influence on concrete deformation characteristics was discussed.