EXPERIMENTAL INVESTIGATION ON THE EFFECT OF PHYSICAL, CHEMICAL AND MECHANICAL PROPERTIES OF FLY ASH AND GROUND GRANULATED BLAST FURNACE SLAG(GGBS) ON CONCRETE

This experiment study aimed to investigate the physical, chemical and mechanical properties of fly ash and blast furnace slag cement concrete. Specific gravity is determined by specific gravity bottle method for cement, fly ash and GGBS. Universal Testing Machine is used for compressive and flexural strength. Characteristics compared to the standard requirements. To determine the compressive strength of fly ash and GGBS, 18 number of cubes for each are tested at the age of 28 days of size (150mm x 150mm x 150mm), grade of concrete is M20, mix proportion is 1:1.5:3 and water-cement ratio is 0.5 and 0.4 for fly ash and GGBS respectively. Different percentages like 0%. 5%, 10%, 15%, 20%, 25% for fly ash and 0%, 10%, 20%, 30%, 40%, 50% for GGBS is tested. Compressive strength of fly ash obtained for 5% replacement of cement has shown significant improvement in various properties at the age of 28 days indicated by 13% increase in compressive strength and In GGBS, 40% replacements has shown significant improvement in various properties at the age of 28 days indicated by 85% increase in compressive strength. To determine the flexural strength a rectangular specimen is considered of size (150mm x 150mm x 500mm), and watercement ratio is 0.4 and 0.5 for fly ash and GGBS respectively. Percentage replacements of cement by fly ash are 0%, 10%, 20%, 30% and for GGBS is 20%, 30%, 40%, 50%. Highest Flexural strength in fly ash is obtained for 20% replacement and strength is 5.43 N/mm2 and in GGBS 30% replacements have got highest flexural strength and the strength is 3.54 N/mm2 .