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. A material other than water aggregates or cement that is used as an ingredient of concrete or mortar to control setting and early hardening workability or to provide additional cementing properties admixtures are generally used to alter the properties of concrete such as increased workability or reduced water content acceleration or retardation of setting time. Because mineral admixtures have an ability to enhance workability as well as finish ability of freshly laid concrete mineral admixtures are also utilized as a replacement of cement as cement is the most expensive material in concrete hence with the use of mineral admixtures reducing concrete cost is very likely possible. 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
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