Optimization of Super Plasticizers Dosage in Concrete with Different Brands of Cement with Complete Replacement of Natural Sand by PS Sand and also Partial Replacement of PS Sand and M-Sand

Concrete is a building material composed of a mixture of cement, water and aggregates with or without chemical admixtures. Now a day's sand is becoming a very scarce material, in this situation research began for inexpensive and easily available alternative material to natural sand. Although aggregates make up three fourths of the volume of concrete, the active constituent of concrete is cement paste [5]. The properties and performance of concrete are largely determined by the properties of the cement paste. In order to obtain workable concrete without strength loss, chemical admixtures such as super plasticizers are added in fresh mix of normal concrete. Super plasticizers in concrete confer some beneficial effects such as acceleration, retardation, air entrainment, water reduction, plasticity etc., and these effects are due to their action on cement [5]. It is important to find the optimum dose of Super plasticizer in order to minimize the trials and labor which leads to know the compatibility in different brands of cement. The experimental tests to determine the Physical properties of Concrete for M30 grade are studied and the results are compared among them. An attempt has been made in this paper to fully replace natural sand by Processed Slag (PS) sand and also partially replace with Processed Slag sand (50%) and Manufactured sand (50%). And also to decide the optimized dosage of Super plasticizers in fresh mix of normal concrete. For all the mixes, an addition of super plasticizer of about 0.5, 0.75 and 1.0% of cement content is used for a fixed water cement ratio. In this paper three different brands of cement namely Birla super, Ramco and Zuari and also two different brands of super plasticizers namely Glenium B233 and Conplast SP430 are selected for the test procedure. The investigations are to be carried out using several test which include workability test, compressive strength test and split tensile strength test.