一前言外加剂做为混凝土的第五种组成已在许多国家得到广泛应用。实践证明:混凝土中适当地掺入外加剂可以改善性能,提高强度,收到了节约水泥用量,扩充混凝土品种等方面的技术经济效益。近一二十年来,世界上对外加剂的研究十分活跃,美国的M.Daimon和D·M·Roy教授,日本的服部健一和大门正机等人在水泥浆体中掺超塑化剂研究方面做了不少工作,最近几年,国内也开始重视外 A foreword that the additive as a fifth component of concrete has been widely used in many countries. Practice has proved that the proper incorporation of admixtures in concrete can improve performance, increase strength, and receive technical and economic benefits in terms of saving cement consumption and expanding concrete varieties. In the past decade or twenty years, the research on admixtures in the world has been very active. Professors M.Daimon and D.M.Roy of the United States, Kenichi Kenichi of Japan, and Masahiro at the gate have been involved in the study of superplasticizers in cement pastes. It has done a lot of work. In recent years, China has begun to pay attention to