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针对蒸汽养护对混凝土可能产生不可逆转的结构破坏和能耗大的问题,采用聚羧酸外加剂的接枝共聚技术,开发出了超早强型的聚羧酸减水剂,并进行了管片混凝土的制备。结果表明,采用超早强型聚羧酸能明显加速水泥的水化进程,促进早期强度的发展,在低温(10℃～20℃)条件下实现管片混凝土的免蒸养,12h可达到管片拆模吊起所需要的强度,这对降低管片混凝土的生产成本、节约能源具有积极的意义。
Aiming at the irreversible structural damage and high energy consumption of concrete caused by steam curing, the ultra-early-strength polycarboxylate superplasticizer was developed by using graft copolymerization of polycarboxylic acid additives. Preparation of sheet concrete. The results show that the use of ultra-early-type polycarboxylic acid can accelerate the hydration process of cement significantly and promote the development of early strength. Under low temperature (10 ℃ ~ 20 ℃) Sheet demolition lift the required strength, which reduce the cost of production of concrete segments, save energy has a positive meaning.