Admixtures Infrastructure Materials Group Admixtures Admixtures are ingredients other than water, aggregates, hydraulic cement, and fibers that are added to the concrete batch immediately before or during mixing. A proper use of admixtures offers certain beneficial effects to concrete, including improved quality, acceleration or retardation of setting time, enhanced frost and sulfate resistance, control of strength development, improved workability, and enhanced finishability.
Admixtures vary widely in chemical composition, and many perform more than one function.
Ash Silica Fume Ground Granulated Blast Furnace Slag Chemical Admixtures Chemical admixtures are added to concrete in very small amounts mainly for the entrainment of air, reduction of water or cement content, plasticization of fresh concrete mixtures, or control of setting time. General and physical requirements for each type of admixture are included in the specifications.