Early strength agent refers to the admixture which can improve the early strength of concrete and has no significant effect on the late strength.
Water reducing agent is a kind of concrete admixture which can reduce the water consumption under the condition of keeping the slump of concrete basically unchanged.
Early strength agents can be divided into strong electrolyte inorganic salts, water-soluble organic compounds, organic and inorganic compound early strength agents according to their chemical composition.
Water reducing agent according to the chemical composition is usually divided into lignosulfonate type of water reducing agent, naphthalene series of high-efficiency water reducing agent, melamine series of high-efficiency water reducing agent, amino sulfonate series of high-efficiency water reducing agent, fatty acid series of high-efficiency water reducing agent, polycarboxylate series of water reducing agent.
Early strength agent in addition to chlorine salt and sulfate nitrite, chromate and other organic compounds such as triethanolamine, calcium formate, urea and so on.
Water-reducing agent category is different, the composition is also very different, mainly a kind of surfactant, is widely used in the third generation of polycarboxylate water-reducing agent.
Early strength agent does not contain chloride ion, no corrosion of steel bar, applicable to all civil and industrial buildings and prestressed reinforced concrete members, mortar and so on. It is most suitable for construction under low temperatures in early winter and early spring.
Water reducing agent is widely used in high-speed railway, high-speed, civil, industrial buildings and prefabricated parts factory, etc., with wide applicability and suitable for four seasons.
Early strength agent dosage is 3-6% of cement. In order to keep the quality of concrete mixed with this agent uniform, people need to extend the mixing time by 1-2 minutes. Concrete mixed with early strength agent cannot use orthopedic active minerals (such as opal). This agent such as damp agglomerate phenomenon, must be crushed or weathered rear can be used, its performance unchanged.
Because there are many kinds of water-reducing agent, it is necessary to choose the appropriate type of water-reducing agent according to the needs of the project. In winter construction, it is recommended to choose the third generation polycarboxylate water reducing agent.
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