Behaviour of Normal Concrete Us ing Superplasticizer under Different Curing Regimes

S N R Shah, Muhammad Aslam, S A Shah, Raja Oad


The performance of concrete primarily depends upon the type and ratio of its constituents,compaction, curing conditions and admixtures used during curing process. Part of this researchemphasis to calculate the consequences on strength of concrete when water-cement ratio is constantand the increase in slump occurs with the increase in amount of superplasticizer by percentage. Therest of the investigation is carried out to study the effects of superplasticizer with different dosagesunder different curing regimes at an ambient field temperature ranges between 45°C-50°C. For thispurpose, a concrete mix at 20MPa with all parameters constant was prepared by using an ASTM C494type A, and F, anionic melamine polycondensate non-toxic superplasticizer with no chlorides.Different dosages of superplasticizer were used in different batches of all 95 specimens, and curedunder different curing conditions and then tested for compressive and tensile strengths followingASTM standards. In all cases, the water curing up to 28 days testing showed maximum strength. Thehighest and lowest values of compressive strength were obtained with the addition of 0.5% and 1%superplasticizer respectively. It was found that without increasing the W/C ratio, the addition ofsuperplasticizer exhibits increase in strength.

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