Do you know the chemical admixtures that affect the deaeration and form a tight structure of the concrete mix?
As a part of a project i was working on, alkali-accelerating admixtures and its dosages affect seriously the density of hardened concrete, i.e., resulted in an increase of the porosity.
However, you can try Air Drives, Mass Water Repellents and Water Retractors.
(1) Sulfonated naphthalene polymer-based superplasticizer shows best performance in improving workability of fresh concrete in comparison with
other chemical admixtures. Second-generation polycarboxylic ether-based superplasticizer can be categorized as the second best chemical admixture in
improving workability of fresh concrete.
(2) Concretes made with sulfonated naphthalene polymerbased superplasticizer and second-generation polycarboxylic ether-based superplasticizer exhibit higher
compressive strengths, splitting tensile strengths, Young’s moduli, and UPVs than concretes prepared with other admixtures.
(3) Superplasticizers show better performances in improving fresh and hardened properties of concrete compared to water reducers.
(4) compressive strength of concrete increases with increase of admixture dosage.If chilled water is used in concrete mix, it remains workable for longer period in comparison with the concrete mix with plain water. Use of chilled
water in fresh concrete causes reduction in early concrete strength but improves the long-term strength property of concrete.
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