STUDY ON HIGH PERFORMANCE CONCRETE WITH REPLACEMENT OF FINE AGGREGATE BY MANUFACTURED SAND

Being cheapest in earlier days the natural sand used in concrete without any alternate even though natural sand containing organic impurities, clay and silt content more than permitted level. Due to excessive mining the river basin environment got affected, the demand for fine aggregate increased and the prevailing market unable to meet the need. Nowadays crushed sand also called as manufactured sand being used as an alternate to natural sand partially or fully. Even though manufactured sand used in normal construction activities, it is not used in high rise structures involving special concretes. Hence it is necessary to study the properties of special concrete with various replacement proportions of fine aggregate by manufactured sand. This will safeguard environment river basin and at the same time unwanted accumulation of crusher dust will put into better use than being used as mere filling material. Experiments conducted on M60 grade concrete with fine aggregate replacement proportion 0%. 25%, 50%, 75% and 100%. The properties such as compressive strength, split tensile strength and ultrasonic pulse velocity are determined from cubes and cylinders cast with manufactured sand procured from kundrathur and river sand taken from Araniar basin. The replacement of 75% natural sand by manufactured sand recommended as this proportion gives comparatively better results in special concrete such as high performance concrete. Hence the manufactured can be used in high performance without any doubt which will also improve the environment as well as sustainability of construction industry.