Improvement of Compressive Strength of Concrete, by Fly Ash and Rice Husk Ash as 40% and 45% Replacement of Cement

In this experiment to study the compressive strength of concrete by combination of fly ash (FA) & rice hush ash (RHA) by partially replacement of cement from 40% & 45% by weight of cement. FA is a by-product of burned coal from power plant & RHA is a by-product of rice husk is well burned at high temperature. Rice husk has high reactivity after burning. FA & RHA is a pozzolanic material. RHA use as a concrete admixture due to high content of SiO2. It improve workability, stability, reduce heat of hydration. FA is also improve workability with lower water demand, less bleeding & segregation, reduce permeability of concrete. The 40% replacement is divided by two group's i.e.20% FA & 20% RHA and second one is 25% FA & 15% RHA. Similarly, 45% replacement is also divided into two parts 15% FA & 30% RHA and 10% FA & 35% RHA. Compressive test on cube for size (150*150*150mm) at 7, 14& 28 days curing as per IS 516-1959. For mix design as per IS 10262-1982 .This replacement concrete is economical by using waste of industry and power plant. Replacement of FA & RHA reduced the environmental issues by disposal of it.