Er Siddharth Shankar, Lecturer, Chief, Central Material Testing Laboratory
and
Dr Hikmat R Joshi, Professor,
Department of Civil Engineering, Pulchowk Campus, Institute of Engineering,
Tribhuvan University, Nepal
Abstract
Strength of a concrete structure may have to be assessed without causing physical damage
to it due to various reasons like its monumental importance or the legal dispute on whether
the strength of the concrete in the structure is satisfactory enough or not. Non destructive
test (NDT) is one of the various ways to estimate strength of the concrete without inflicting
any significant damage to it. In this paper correlation between the actual strength of a
concrete by destructive test (DT) method and that by NDT method has been studied. The
methods used are Schmidt Hammer (SH) (or rebound hammer) and ultrasonic pulse
velocity (UPV) as NDTs and test by compression testing machine (CTM) as DT. In this
study separate correlations have been done for two NDTs and a procedure to follow while
estimating strength of concrete by NDT has been recommended.
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