NDT Correlations for Compressive Strength Assessment of Concrete

To determine the in-situ compressive strength of concretes, rebound hammers (Schmidt hammer) and Windsor pins (Resistance to Penetration Tests) are commonly used. However, the correlations between the rebound number, penetration value and the compressive strength depend strongly on the test condition and aggregate characteristics. We have developed the correlations in Bangladesh context so that the reliability in strength prediction can be enhanced. The outcome is important in the assessment of existing buildings for extension, renovation, repair or further strengthening.