AN EXPERIMENTAL INVESTIGATION ON MECHANICAL BEHAVIOUR OF CONCRETE BY PARTIALLY REPLACING CEMENT WITH PHOSPHOGYPSUM

The present paper deals with the effective utilization of Phosphogypsum (PG) in the production of concrete and to formulate the optimum percentage of Phosphogypsum to replace cement, thereby increasing the mechanical properties of concrete. Phosphogypsum is a component of few fertilizers and chemicals. environment to dispose this byproduct, the cost of cement is found to grow gradually. Thus, the partial replacement of cement with phophogypsum is an initiative to increase the mechanical properties of concrete by cost of cement in concrete. The experimental study was carried out by replacing cement with Phosphogypsum accordingly in the range of 0% (without PG), 5%, 10%, 15% and 20% with constant water compressive strength test was carried out on cubes of size 150 x 150 x 150mm at the age of 7 days, 14 days and28 days. At the age of 7 days,14 days, 28 days the compressive strength of phosphogypsum concrete (PGC) with 5%, 10% and 15% is found to increase by 10%, 22% and 33.8%, 9.05%, 18% and 25.4%, 20.8%, 28.7% and 36.7% respectively compared control specimens. Similarly the compressive strength of PGC with 20% PG is found to fall by 15.5%, 17.8% and 7.12% from conventional concr results indicated that the optimum percentage for replacement of cement with PG could be 15%.