EXPERIMENTAL STUDY ON PROPERTIES OF CONCRETE BY PARTIAL REPLACEMENT OF CEMENT WITH SILICA POWDER AND FINE AGGREGATE WITH SAW DUST ASH

Saw dust Ash (SDA) generated from rice mills is usually delivered to landfills for disposal. Using of sawdust ash in concrete is an interesting possibility for economy on waste disposal sites and conservation of natural resources .This paper examines the possibility of using sawdust ash as replacement in fine aggregate for a new concrete. Natural sand was partially replaced (5%, 10%, and 15%) with SDA. Compressive strength and Tensile strength (cubes and cylinders) on 7, 14 and 28 days of age were compared with those of concrete made with natural fine aggregate. Fineness modulus, specific gravity, water absorption, Bulk density for sand (S) and SDA were also studied. The characteristic compressive strength of concrete is M25. The test results indicate that light weight of concrete and it is possible to manufacture concrete containing sawdust ash with characteristics similar to those of natural fine aggregate concrete provided that the percentage of sawdust ash as fine aggregate is limited to 5% respectively.