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The estimation of mechanical properties and strength of concrete can be carried out by several methods; destructive and non destructive. In this study crushing strength of concrete cubes is the usual destructive test to determine the compressive strength of concrete. The rebound hammer test, ultrasonic pulse velocity and core test are the non destructive tests to determine compressive strength of concrete and to obtain correlation between them. In this work using M-20 grade of concrete twelve numbers of concrete cubes of size (150mmx150mmx150mm) were cast using the water cement ratio 0.55. The five numbers of slabs of size 500mmx500mm with 120mm thickness were made by same water cement ratio. An experimental study was conducted to determine the correlation between actual compressive strength of concrete cubes and strength estimated from cores having different H/D ratio (1.5, 1.75 and 2.0) and diameter of 50mm. totally thirty numbers of cores were extracted from the concrete slabs, fifteen numbers of cores were extracted from concrete portion (without reinforcement) and other fifteen numbers of cores were extracted with reinforcement. The results indicate that the cores with reinforcement of H/D ratio 1.5, 1.75 and 2.0 indicate greater compressive strength as compared to cores free from reinforcement for the same H/D ratio and core compressive strength increases with increase in the H/D ratio. The very good correlation coefficient (0.979) is obtained.

Correlation between Actual Compressive Strength of Concrete and Strength Estimated From Core