superplasticizer chemical admixtures cement additives

In the 1930s, it was found that after mixing sulfite pulp waste into concrete, the workability of the mix could be improved, and the strength and durability could also be improved. In 1935, E. W. Scripture in the United States first developed a water-reducing agent with linosulfonate as the main component, and obtained a patent in 1937. In the 1950s, it was widely used in the United States slip form concrete, dam concrete and winter construction concrete. In 1962, Hattori Ken, first of all, of the Japanese Kawang alkali Company, first developed a water reducer with R mononaphthalene sulfonate formaldehyde condensation sodium salt as the main component, referred to as naphthalene series water reducer. This type of water reducer has the characteristics of high water reduction rate, and is suitable for preparing high strength (compressive strength up to 100MPa) or slump up to 20 (2) concrete. Subsequently, in 1964, the Federal Germany successfully studied sulfonated melamine formaldehyd…