Superplasticizer is a concrete slump maintaining under the same conditions, can reduce the mixing water of concrete admixtures. Most belong to the anionic surfactants, there is lignin sulfonate, naphthalene sulfonate formaldehyde polymer. After adding concrete mix to cement particles have a dispersion can improve their work, reducing the unit water consumption, improve the fluidity of fresh concrete; or reduce the amount of cement units, saving cement. Morphology into a liquid and a powder. Agent solids generally have 20%, 40% (also known as mother liquor), 60%, powders solids content is generally 98%. According to Save the water reducing agent and empowerment, is divided into ordinary water reducer (also known as plasticizers, water-reducing rate of not less than 8% lignin sulfonate as the representative), superplasticizer (also known as Super plasticizing agents, water-reducing rate is not less than 14%, including naphthalene-based, melamine-based Sulphamate, aliphatic, etc.) and high-performance water-reducing agent (water reduction rate of not less than 25% poly-carboxylic acid superplasticizer as the representative), and they were divided into early and strong type, standard retarding type. According to the composition of material is divided into: (1) lignin sulfonate; (2) a polycyclic aromatic salt; (3) a water-soluble resin sulfonate. Naphthalene superplasticizer, aliphatic superplasticizer, amino superplasticizer, polycarboxylate superplasticizer like. According to the chemical composition is usually divided into: lignin sulfonate type superplasticizer, naphthalene superplasticizer type, melamine superplasticizer, amino sulfonate superplasticizer, fatty acid-based high Deals agent class, polycarboxylate superplasticizer categories.