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Correlation between Compressive Strength of Concrete Using Schmidt Rebound Hammer and Universal Testing Machine of Concrete (Replacement of Cement with C.E.T.P sludge)

Abstract—This paper aims to study the correlation between Non-destructive testing of concrete also known as Schmidt Rebound Hammer Testing and Destructive testing methods which is testing in Universal Testing Machine (UTM). The rebound hammer was invented by Ernst Schmidt. The hammer measures the rebound of a spring-loaded mass impacting against the surface of the sample. The test hammer will hit the concrete at a defined energy. Its rebound is dependent on the hardness of the concrete and is measured by the test equipment. By reference to the conversion chart, the rebound value can be used to determine the compressive strength. The universal testing machine of 1000kN capacity was used to test the compressive strength of concrete. In this research work, industrial sludge from a common effluent treatment plant was utilized as a replacement of cement. This sludge was recovered from The Green Environment Services Co-op Society Ltd., Vatva, Gujarat. Cement is replaced by C.E.T.P (Common Effluent Treatment Plant) sludge by 2%, 5% and 10%, where cubes of different ages such as 28 days, 90 days and 180 days were casted.

Index Terms—schmidt rebound hammer, universal testing machine, common effluent treatment plant, C.E.T.P (common effluent treatment plant) sludge by 2%, 5% and 10%.