减水剂是一种很有前途的混凝土外加剂,它是改革混凝土施工工艺、提高混凝土性能、节约水泥的有效措施之一。掺入少量减水剂,在不增加水泥用量的情况下,可配制出和易性好、大坍落度的混凝土,满足一般泵送要求。由于现代工业的发展,各种工程对混凝土性能提出了越来越多的要求。有的要求抗压强度在800公斤/厘米~2以上,有 Water reducer is a very promising concrete admixture. It is one of the effective measures to reform concrete construction technology, improve concrete performance and save cement. With the addition of a small amount of water-reducing agent, the concrete with good workability and large slump can be prepared without increasing the amount of cement, meeting the general pumping requirements. Due to the development of modern industry, various projects put forward more and more requirements for the performance of concrete. Some require a compressive strength of 800 kg/cm2 or more.