Effect of Addition of Combination of Admixtures on the Properties of Self Compacting Concrete Subjected to Cholride Attack

This paper presents an experimental investigation onthe effect of acid attack on the properties of SCCproduced by the combination of admixtures such as(Superplasticizer + Viscosity modifying admixture+Air entraining agent + Accelerator),(Superplasticizer + Viscosity modifying admixture+Air entraining agent +Retarder), (Superplasticizer +Viscosity modifying admixture +Air entraining agent+ Water proofing compound ) and (Superlasticizer +Viscosity modifying admixture +Air entraining agent+ Shrinkage reducing admixture). The concretetesting specimens was prepared by a mix proportion1:2.7:6.1:5.1 with cement: fly ash: sand: coarseaggregate with a water/binder ratio of 0.38.Specimens after 28 days of curing were immersed inmagnesium chloride solution of 5% and 10%concentrations for 90 days. Before immersion, theywere weighed accurately. After 90 days of immersion,the specimens were removed from chloride media,washed in running water, weighed accurately andtested for their respective strengths. Before testing,the specimens were drilled to a depth of 30mm. Thepowder collected in this manner was titrated againstAgNO3 solution to find chloride content in theconcrete. SCC produced with above combination ofadmixtures show better resistance to chloride attackas compared to SCC produced with combination ofadmixtures (SP+VMA) only.