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admixtures:
Admixtures are added to the concrete before or during mixing,to modify one or more of the
specific properties of concrete in the fresh or hardened states.IS:9103 1979 lays down the procedures for evolution of admixtures for concrete.the different types of admixtures used are given below.
1. Accelerating admixtures : these are added to concrete to increase the rate of early strength development,which in turn facilitates earlier removal of form work.common accelerators are calcium chloride,fluosilicates and trietanlamine.
2.Retarding Admixtures : these are added to slow down the rate of setting of cement they are useful in hot weather concreting.common types of retarders are starches and cellulose products,sugar and hydroxyl-carboxylic acids.
3. Water Reducing or plasticizing Admixtures : the addition of plasticizer allows greater workability for given water cement ratio or alternatively retains or alternatively retains the workability while reducing the water content. the basic ingredients of water reducing agents are either lignosulphonate slats or polyhydroxy compounds.
contact : Rao(09966871942)
admixtures:
Admixtures are added to the concrete before or during mixing,to modify one or more of the
specific properties of concrete in the fresh or hardened states.IS:9103 1979 lays down the procedures for evolution of admixtures for concrete.the different types of admixtures used are given below.
1. Accelerating admixtures : these are added to concrete to increase the rate of early strength development,which in turn facilitates earlier removal of form work.common accelerators are calcium chloride,fluosilicates and trietanlamine.
2.Retarding Admixtures : these are added to slow down the rate of setting of cement they are useful in hot weather concreting.common types of retarders are starches and cellulose products,sugar and hydroxyl-carboxylic acids.
3. Water Reducing or plasticizing Admixtures : the addition of plasticizer allows greater workability for given water cement ratio or alternatively retains or alternatively retains the workability while reducing the water content. the basic ingredients of water reducing agents are either lignosulphonate slats or polyhydroxy compounds.
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