【摘要】 掺煅烧氧化镁的水泥具有延迟膨胀的性能,水泥浆体在50℃水化时,水化3天到15天的膨胀速率最大,这正是大坝混凝土温降明显阶段,故可补偿混凝土温降引起的体积收缩,简化温控措施。氧化镁水泥的膨胀性能主要决定于氧化镁膨胀剂的膨胀性能。试验表明,调整氧化镁的煅烧制度,可以改变其膨胀速率、膨胀量及膨胀的终止期。更多还原

【Abstract】 Cement with calcined magnesia addition possesses the property of delayed expansion. When the paste is hydrated at 50℃, the rate of expansion is the maximum after 3 to 15 days hydration, the temperature of mass concrete decreases considerably just during these days, thus the expansion may compensate the volume shrinkage caused by the drop of temperature, and simplify the measures of temperature control. The expansion properties of cement with magnesia addition depend mainly on the expansion property of the calcined magnesia. Experimental results show that by changing the calcination conditions, the rate, amount and ending period of expansion can be regulated.更多还原