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一、前言混凝土外加剂的使用已有五十年历史。随着土木工程和建筑施工的发展,出现了许多超大型的特种混凝土结构和许多新工艺。这些结构的建造和新工艺的实现,是与使用外加剂,特别是减水剂分不开的,所以有人认为外加剂可作为混凝土的第五个组成部分是有一定道理的。减水剂,又称水泥分散剂,是一种表面活性剂,掺入混凝土混合物中,能使水泥颗粒起扩散作用,把水泥凝聚体中包含的水释
I. INTRODUCTION The use of concrete admixtures has been in use for fifty years. With the development of civil engineering and construction, many super large-scale special concrete structures and many new processes have emerged. The construction of these structures and the realization of new processes are inseparable from the use of admixtures, especially water-reducing agents, so some people think that admixtures can be used as the fifth component of concrete is a certain truth. Water reducer, also known as cement dispersant, is a surfactant that is incorporated into the concrete mixture to enable the cement particles to diffuse and release the water contained in the cement aggregates.