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Additives in concrete

concrete additivesAdditives are some physical or chemical ingredients in concrete with the different properties, and they are added to the mixture immediately before or during mixing except for Portland cement, water, and aggregates. They can be classified into various types by function as follows: high performance water reducing agent (accelerating type, normal type, retarding type), high efficiency water reducing agent (normal type, retarding type), normal water reducing agent (accelerating type, normal type, retarding type), air-entraining water reducing agent, pumping aid, accelerating agent, retarding agent, air-entraining agent, anti-washout agent, shrinkage reducer, foaming agent, corrosion inhibitor, etc.

The picture shows some liquid admixtures to us, from left to right: anti-washout agent, shrinkage reducer, water reducer, foaming agent, corrosion inhibitor, and air-entraining agent.

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