Cement and concrete mineral admixtures concentrates mostly on natural pozzolans fly ashes ground granulated blast furnace slag silica fume and limestone powder namely the most commonly used mineral admixtures others such as metakaolin rice husk ash expanded clays and shales are also discussed. Mineral admixtures of concrete types of mineral admixtures cementitious admixtures of concrete these have cementing properties themselves for example ground granulated blast furnace slag ggbfs pozzolanic admixtures of concrete a pozzolan is a material which when combined with calcium hydroxide lime exhibits cementitious properties. Supplementary cementing materials and other mineral admixtures are being used in increasing amounts in both cement and concrete their main technical benefits are that they enhance the workability of fresh concrete and the durability of hardened concrete. Mineral admixtures and chemical admixtures are the extra ingredients other than water cement aggregates and fibers these are added to the concrete batch plant during batch mixing or at the start when other quantities are added
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