If concrete compression test fails, should Schmidt hammer test be adopted as an alternative test to prove the concrete strength?

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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 considered a good substitute for concrete compression test.


This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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  • Sathiyaseelan January 6, 2012 at 3:58 am

    How to calculate the strength of concrete from rebound number?

  • HARSHAL S KHODE August 30, 2013 at 11:28 pm

    Dear Sir,

    Please submit the details calculation sample for rebound hammer test data.


  • r.m.l.u. rathnayaka October 31, 2014 at 10:20 pm

    Please send be data about how to calculate rebound hammer samples data

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