Superplasticizing admixtures interact chemically with the ingredients of concrete and affect thernconcrete properties in the fresh and hardened state. Now a days, its possible to produce concreternhaving better quality with the addition of superplasticizing admixture in different ways by savingrnsome amount of mixing water and cement for a given mix design.rnThe objective of this research was to study the effects of superplasticizing admixture on concreternproperties, such as: workability, compressive strength, flexural strength and permeability.rnTherefore, in order to study those properties mega flow SP1 (chroride free, superplasticizingrnadmixture based on selected sulphonated naphthalene polymers), type F complying with ASTMrnC494, BS EN 934-2 was used throughout the experiments. The experiments were performed onrnC-25 and C-60 concrete grades which have 0.58 and 0.33 water to cement ratio with a slumprnoabstractf 30-60mm and 10-30mm, respectively, at a dosage of 0%, 0.5%, 1% and 1.5%rnadmixture. To facilitate the study, the experiments have been classified into four phases, such as:rnPhase I: to study the effects of superplasticizing admixture on workability, Phase II: to study therneffects of way of superplasticizing admixture addition on concrete quality, Phase III: to study therneffects of superplasticizing admixture on concrete quality by reducing amount of mixing waterrnand Phase IV: to study the effects of superplasticizing admixture on concrete quality by reducingrncement content.rnBased on the work results 1.5% superplasticizing admixture have shown higher value ofrnworkability and 1% superplasticizing has been provided the optimum results on strength in phasernI and IV. In case of phase II by using 1% superplasticizing admixture, addition of admixture atrnthe end was shown better result on workability, but the strength was improved by addingrnadmixture at the middle of mixing. However, in case of phase III 1.5% superplasticizing additionrnhas shown higher result on compressive, flexural and premiblity.rnFinally, the addition of superplasticizing admixture was shown improvement on workability,rnstrength (compressive and flexural) and permeability from the reference concrete