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高效减水剂(指减水率大的减水剂,以下简称H-R)正越来越大量地用于北美的预制混凝土制品中,这是因为它的应用可以减少水泥用量、改善工作度、加快强度的发展。H-R 已经在北美用了大约5年,应用范围虽远没有欧州或日本广泛,但已发现它在预制混凝土应用中有特别的优越之处。除改善混凝土拌合物的工作度与制品的抗压强度外,它还可以缩短达到脱模强度的时间,使预制厂模板周转更快,生产更多的制品。
Superplasticizers (water reducing agents, hereinafter referred to as HR) are increasingly being used in North American precast concrete products in greater and greater quantities because of their use to reduce the amount of cement, to improve work efficiency, to speed up Strength development. H-R has been used in North America for about 5 years, although its application range is far less widespread in Europe or Japan, but it has been found to have particular advantages in precast concrete applications. In addition to improving the workability of concrete mixes and the compressive strength of the product, it can also shorten the time to mold release strength and make the prefabricated formwork faster and produce more products.