What are the common reasons for using retarder?

high-efficiency retarder is mainly a concrete admixture composed of retarder, air-entraining and other components, and has the properties of super plasticization, high water reduction, and good water retention. this product implements the standards gb8076-1997 “concrete admixtures”, gb/t8077-2000 “test methods for homogeneity of concrete admixtures”, gb18588-2001 “limits of nitrogen released by concrete admixtures”ii. product features1. excellent…