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在大体积混凝土如大坝混凝土中,由于水泥水化放出水化热,在水化五六天内坝体内部达最高温度,之后因热量散失,坝体温度降低,体积收缩,当受到约束时,就会产生裂缝。因此大坝建设中,怎样防止混凝上的降温裂变已日益受到人们的重视。这也是能源部下达给我院等七家单位合作完成的科研项目—氧化镁微膨胀水泥混凝土的研制与温度应力补偿研究。我院硅工系崔雪华、刘峥等老师通过研究发现:氧化镁含量较高的高镁水泥具有延迟膨胀之性能。大坝混凝土的裂缝主要产生在温降阶段,因此补偿大坝混凝土体积收缩的膨
In mass concrete such as dam concrete, due to the hydration heat of cement hydration, the temperature inside the dam reaches its maximum temperature within five to six days of hydration. Afterwards, due to heat loss, the temperature of the dam decreases, the volume shrinks, and when it is constrained, Cracks will occur. Therefore, in the construction of dams, how to prevent the cooling and fission on the coagulation has attracted increasing attention. This is also a research project jointly completed by the Ministry of Energy, including seven institutes in our institute, for the research and development of temperature-compensated magnesium oxide micro-expanded cement concrete. Our teachers from the Department of Silicon Industry, such as Cui Xuehua and Liu Wei, discovered through research that high-magnesium cement with high magnesium oxide content has the property of delayed expansion. Dam concrete cracks mainly occur in the temperature drop stage, so compensating for the volume expansion shrinkage of the dam concrete