The functions and uses of water reducing agents

The water-reducing agent has a dispersing effect on the cement particles after being added to the concrete mixture, which can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save money. cement. Water-reducing admixture is a concrete admixture that reduces mixing water consumption while maintaining the slump of concrete basically unchanged. Most water reducing agents are anionic surfactants, including lignin sulfonate, naphthalene sulfonate formaldehyde polymer, etc.

Extended information: The water reduction rate of high-efficiency water-reducing agent can reach more than 20%. Mainly naphthalene series, melamine series and water-reducing agents compounded from them, of which naphthalene series is the main one, accounting for 67%. Especially in my country, most of the high-efficiency water-reducing agents are naphthalene-based high-efficiency water-reducing agents with naphthalene as the main raw material. Its characteristics are high water reduction rate (15% to 25%), no air entrainment, little impact on setting time, relatively good adaptability to cement, can be used in combination with various other admixtures, and the price is relatively cheap. Naphthalene-based superplasticizers are often used to prepare high-fluidity, high-strength, and high-performance concrete. Naphthalene series superplasticizers can be divided into high-concentration products (Na2SO4 content <3%), medium-concentration products (Na2SO4 content 3% to 10%) and low-concentration products (Na2SO4 content) according to the Na2SO4 content in their products. Content>10%). Most naphthalene-based high-efficiency superplasticizer synthesis plants have the ability to control the Na2SO4 content below 3%, and some advanced companies can even control it below 0.4%.