Comparative study of three techniques for assessment of in-situ strength of concrete

摘要

Two of the most commonly used NDT methods for the approximate estimation of strength of concrete in structures are rebound hammer and ultrasonic pulse velocity (UPV). It is also possible to assess in-situ strength of structural grade concrete indirectly through the knowledge of its pore structural characteristics obtained from mercury intrusion porosimetry (MIP). Hence, in this study the in-situ strength of structural grade concrete in laboratory-cast beam specimens was assessed using MIP, rebound hammer and UPV test methods. A comparative study among these three methods of strength assessment carried out by using suitable statistical parameters suggests that the mercury intrusion porosimetery technique of strength assessment of concrete is as reliable as the rebound hammer and UPV test methods.