Water reducing agent is one type of additives that is widely used in concrete/dry mixed mortar. Its effect is very important. Generally, there are three main factors that affect the effect of water reducing agent.

According to the definition of the national standard "Concrete Admixtures", high-performance water-reducing admixture refers to a higher water-reducing rate, better slump retention performance, less drying shrinkage than high-efficiency water-reducing admixtures, and has For water-reducing agents with certain air-entraining properties, the water-reducing rate should be no less than 25%.

Polycarboxylate superplasticizer, also known as PCE, is a high-performance chemical additive that is used in the construction industry to improve the workability and performance of concrete. 

Naphthalene based superplasticizer (sodium naphthalene sulfonate formaldehyde condensate) and some other chemical admixtures play an important role in modern concrete materials and technologies. 

In the 1930s, it was discovered that mixing sulfite pulp waste liquid into concrete can improve the workability of the mixture, and the strength and durability of concrete can also be improved. In 1935, an American first developed a water reducer with lignosulfonate as the main component.