From the perspective of the performance development process of water reducing agents, the development of water-reducing agents can be divided into the following four stages:
① Development and application of ordinary water-reducing agents represented by lignosulfonate;
② Superplasticizer represented by β-naphthalenesulfonate formaldehyde condensate (PNS) and sulfonated melamine formaldehyde condensate (PMS);
③ A superplasticizer with slump retention ability modified PNS and PMS;
④ A new type of superplasticizer with high water reducing ability and fluidity retention ability, such as polycarboxylate superplasticizer (PC).
