Know about the classifications of Concrete Water Reducer

Water reducing agent is a concrete admixture that may reduce the quantity of mixing water beneath the condition that the slump of the concrete is simply unchanged. To be able to improve and adjust the function of concrete or mortar, organic, inorganic or composite compounds are often added during mixing. After adding the concrete mixture, it has a dispersing influence on the cement particles, 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 cement.

The absolute most commonly used water reducers are lignosulfonates and their derivatives, higher polyols and polyol complexes, hydroxycarboxylic acids and their salts, polyvinyl ethers and their derivatives, etc.

Superplasticizers mainly include, naphthalene sulfonate condensate, polycyclic aromatic hydrocarbon sulfonate formaldehyde polycondensate, sulfamate, melamine sulfonate formaldehyde polycondensate, etc.

High-performance water-reducing agents are now mainly polycarboxylic acid-based water-reducing agents.

Lignosulfonate. It is a common water reducing agent. Its raw material is lignin, which can be generally extracted from coniferous trees. Lignin is polymerized from three lignin monomers: p-genol, coniferyl alcohol and sinapyl alcohol. It is employed for mortar. It may improve workability, fluidity and strength, and the water reduction rate is 5%-10%.

Naphthalene sulfonate water reducer. It is a high-efficiency water reducer that we used earlier. It is the product of sulfonation of naphthalene by sulfuric acid and condensation with formaldehyde. It is definitely an anionic surfactant. The appearance of this type of water-reducing agent may be light yellow to darkish powder depending on the product, easily soluble in water, and has a good dispersing influence on many powder materials such as for instance cement, with a water reduction rate of 25%.

Melamine water reducing agent. It is the product of sulfonation of melamine by sulfuric acid and condensation with formaldehyde, and so the chemical name is sulfonated melamine formaldehyde resin, which belongs to anionic surfactants. The appearance of this type of water reducing agent is white powder, which can be easily soluble in water, has good dispersion to powder materials, has high water reduction rate, and has good fluidity and self-repairing properties.

Powder polycarboxylate. It is a new form of high-performance water-reducing agent developed in recent years. It's excellent water-reducing rate, fluidity and permeability. It obviously enhances the strength of cement mortar, nevertheless the production process is complicated and the purchase price is generally higher.

Casein. It is a biopolymer obtained by precipitation of milk with acid and cylinder drying.

Polycarboxylic acid-based high-performance water reducer. Polycarboxylic acid-based high-performance water-reducing admixture is a type of concrete superplasticizer with advanced technology content, good application prospect and excellent comprehensive performance in the world.

At present, the polycarboxylate PCE superplasticizer is trusted, which really is a compound product of carboxylate graft copolymer and other effective additives. The performance comparison with other similar products shows that the polycarboxylate series high-performance water reducing agent has reached the advanced level of today's society with regards to technical performance indicators and cost performance. Polycarboxylate superplasticizers are mainly used to formulate low-water-cement ratio, high-strength, self-compacting and high-durability concrete. It is the key development direction of concrete powerful water reducer.

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