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The Scmidt hammer test is based on the elastic
rebound of hammer
which presses on concrete surface and it
measures the surface hardness of concrete.
Since the test is very sensitive to
the presence of aggregates and voids at the concrete surface, it is
necessary
to take more than 10 readings over the area of test.
However, it should
be
noted that Schmidt hammer test
measures surface hardness only but not the
strength of concrete. Therefore,
it may not be a good substitute for
concrete compression test.
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