Effect Of Concrete Mix Design On Non-Destructive Test Results For Strength Evaluation

In ND methods of durability monitoring, a wide area of applications is concerned due to its possibility of assessment conditions without causing damage to structures. Those methods are also being fine-tuned to create the connection of ND results to durability indicators of concrete under challenging environmental conditions such as marine exposure where gradients in water and chlorides significantly accelerate the deterioration. The non destructive methods such as ultrasonic pulse velocity and rebound hammer tests help in analysing the on- site behaviour of materials without causing any structural damage. More reliable descriptions of the in-situ behavior of in-place materials are available in ND techniques, like those of. Relations between UPV and core and cylinder compressive strengths together with rebound hammer results is being studied in this paper. The properties are compared to modulus of elasticity, bond strength, and cube compressive strength, which shows how rebound hammer tests performs when compared with other measures. An experimental process based on combination of ND and DT techniques to evaluate various grades of concretes, including M20 grade has been studied. For the slab samples, cores from each were obtained and were tested besides 100x200 mm cylinders and 150x150x150 mm cubes for testing compressive as well as pull-out strengths. Various methods such as UPV and rebound hammer showed good promising results for evaluating durability as well as integrity of a structure. The results confirm that the robust integration of ND methods with destructive methods for assessing concrete properties have underlined value in preserving the structural heritage and enhancing the long-term monitoring of the durability of concrete in adverse environments.