随着我国基本建设的发展,混凝土需用量与日俱增,同时,由于施工和工程结构对混凝土的性能和工艺不断地提出了新的要求,所以,近年来国内外都采用掺外加剂的办法,以改善混凝土的性能。外加剂的种类很多,人们熟知的有早强剂、减水剂、加气剂、速凝剂、防锈剂、膨胀剂等。减水剂是目前使用较多的一种外加剂。在大体积混凝土浇灌时,希望减少水泥的水化热,推迟热峰出现时间,以防止温度裂缝的发生。为了加快施工速度和减轻混凝土施工中振捣的繁重劳动,希望采用流动性大的混凝土,浇灌时稍加振捣或不需振捣即 With the development of China’s basic construction, the amount of concrete required has been increasing day by day. At the same time, due to the construction and engineering structure, new requirements have been constantly put forward for the performance and technology of concrete. Therefore, in recent years, the use of admixtures has been adopted at home and abroad to improve The performance of concrete. There are many types of admixtures, and there are known early strength agents, water reducers, air entrainers, accelerators, rust inhibitors, and swelling agents. Superplasticizers are currently used as an admixture. When mass concrete is poured, it is desirable to reduce the heat of hydration of the cement and postpone the appearance of heat peaks to prevent temperature cracks from occurring. In order to speed up the construction process and reduce the heavy labor involved in concrete construction, it is hoped that concrete with high fluidity will be used, and a little vibration or no vibration will be needed when watering.