Authors: N N Priya Darshini*, D Rambabu**
Abstract: River sand, the most commonly used fine aggregate in concrete is very expensive now. Day by day, the cost of sand is increasing due to the scarcity and restrictions. Huge quantity of sand excavated from river bed destroys the stability of river banks. To avoid such situation and to meet the demand we have to think of an alternative or replacement material to sand. Crushed rock material, fly ash and sea sand are some of the alternatives. Different sizes of metal like 40 mm, 20mm and 10mm are obtained by crushing boulders of rock into small pieces in crushers. The residue of size less than 4.75 mm is called quarry dust which attracts various researchers as an alternative to river sand. This experimental work describes the study on the feasibility of the quarry dust for usage in concrete. To study the effect of quarry dust on the use of super plasticizer, sulphonated naphthalene based super plasticizer was added with fresh concrete of grades M20 and M25 using OPC and PPC separately. Super plasticizer was added at 1.2 lit/100 kg of cement as per the recommendation of the manufacturer. Water cement ratio was found out by conducting slump test for a constant slump of 60 mm. Tests were conducted in limited ratios of sand: quarry dust choosing one ratio each above and below the one giving maximum strength say 60:40, 50:50 and 40:60. At the age of 28 days the compressive strength, tensile strength and flexural strength were determined. From the test results it is found that the compressive strength, tensile strength and flexural strength are maximum at 50:50 ratios. These results on strength studies give a clear conclusion that quarry dust can be used as a good substitute for natural river sand with higher strength at 50% replacement compared with control concrete.
Keywords: - River Sand, Compressive strength, tensile strength, flexural strength, mechanical properties
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