无碱液态高效水泥速凝剂的研制与速凝机理研究  

Preparation of Non-alkali High Efficiency Liquid Cement Setting Accelerator and Acceleration Mechanism Research

作　　者：王军[1] 高飞[1] 邱树恒[2] 顾瑞[1] 

机构地区：[1]中建商品混凝土有限公司华中分公司,武汉430080 [2]广西大学材料科学与工程学院,南宁530004

出　　处：《混凝土与水泥制品》2013年第4期14-17,共4页China Concrete and Cement Products

摘　　要：通过对聚合硫酸铝进行改性,研制出一种无碱液态高效水泥速凝剂。研究结果表明,当速凝剂掺量为5%时,可使P.O 42.5级水泥的初凝时间缩短至2min48s,终凝时间缩短至4min37s,1d抗压强度达到8.6MPa,1d、28d抗压强度和抗折强度保留率分别为79.63%、81.89%和78.13%、97.89%。采用XRD、DSC测试手段对水泥的水化样进行分析,探讨了这种速凝剂的速凝机理。A kind of non-alkali high efficiency liquid cement setting accelerator is developed by regulating the chemical composition of potymerized aluninum sulfate. The results show that the initial setting time and the final setting time are sharply shortened to 2 minutes 48 seconds and 4 minutes 37 seconds respectively and the ld compressive strength reaches to 8.6MPa when the dosage of the setting accelerator is 5%, Meanwhile, its compressive strength and flexural strength retention at the age of ld and 28d reach to 79.63%,81.89% and 78.13%,97.89% respectively. Phase characteristics on the hydrated cement specimens by means of XRD and DSC are analyzed and the acceleration mechanism is discussed.

关 键 词：水泥速凝剂 凝结时间 抗压强度 速凝机理 

分 类 号：TU528.042[建筑科学—建筑技术科学]