近年来,混凝土化学外加剂的研究、生产和使用在国内外都有很大的发展。外加剂的类型和品种很多,主要有早强剂、加气剂、减水剂、缓凝剂、速凝剂、膨胀剂、阻锈剂、防水剂等,每个类型外加剂的品种也很多,有的多达数十种、数百种。这些外加剂中以早强剂、加气剂和减水剂的应用最为广泛。国内已在铁 In recent years, the research, production and use of concrete chemical admixtures have developed at home and abroad. There are many types and types of admixtures, including early strength agents, air entrainers, water reducers, retarders, accelerators, swelling agents, rust inhibitors, water repellents, etc. There are as many as tens or hundreds of species. Among these admixtures, the early strength agents, air-entraining agents and water-reducing agents are the most widely used. Domestically already in iron