Early strength admixture refers to the admixture that can improve the early strength of concrete and has no significant effect on the later strength.
Superplasticizer for concrete is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged.
Early-strength agents can be divided into three categories according to chemical composition: strong electrolyte inorganic salts, water-soluble organic compounds, and composite early-strength agents composed of organic and inorganic compounds.
Polycarboxylic superplasticizers are usually divided into: lignosulfonate superplasticizers, naphthalene superplasticizers, melamine superplasticizers, sulfamate superplasticizers, and fatty acid superplasticizers according to their chemical composition. Superplasticizers, polycarboxylate superplasticizers.
3 Main ingredients
In addition to chloride and sulfate, early strength agents include nitrite, chromate, etc., as well as organic substances such as triethanolamine, calcium formate, urea, etc.
Different types of superplasticizer for concrete have very different components. It is mainly a surfactant. Currently, the third-generation polycarboxylate superplasticizer is widely used.
The early strength agent does not contain chloride ions and has no rust effect on steel bars. It is suitable for all civil and industrial buildings, prestressed reinforced concrete components, mortar, etc. It is most suitable for construction under low temperature conditions in early winter and early spring. .
Water reducing agent is widely used in high-speed rail, high-speed, civil, industrial buildings and prefabricated component factories, etc. It has wide applicability and is suitable for all seasons.
The dosage of early strength agent is 3-6% of cement. In order to keep the quality of the concrete mixed with this agent uniform, the stirring time is prolonged by 1-2 minutes. Concrete mixed with early strength agent cannot use active mineral orthopedics (such as opal). If this agent is damp and agglomerated, it must be crushed or weathered before use, and its performance remains unchanged.
Because there are many types of superplasticizers, the appropriate type of superplasticizer should be selected according to the needs of the project. For winter construction, it is recommended to use the third-generation polycarboxylate superplasticizer.
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