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[P.K.Mallick]

A COMPREHENSIVE REVIEW OF CORE TEST FOR HARDENED CONCRETE.

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Points for discussion:

1)     IS: 516(Part 4): 2018 stipulates at least three methodologies for acceptance criteria of core test results including the method enumerated in IS:456. The code further says that the procedure of assessment of the strength of concrete by core test has been modified to make it in line with the present acceptance criteria given in IS: 456 for acceptance cube test results. The question here is that for IS:516(Part-4), the final acceptance criteria is as follows:
a)     Average of equivalent cube strength of minimum three cores is more than 0.85 times the specified cube strength.
b)     No individual core has equivalent cube strength less than 0.75 times Cube strength.
               
             Hence, so being the case, then how this acceptance criteria for concrete core is in      tune with Clause-16 of IS: 456, the acceptance criteria of concrete cube?


  
2)     The clause No B-2.5.2(C) of IS: 516 stipulates about the Structural Adequacy. The matter should have been concluded there. But Code goes one step further by stating that contractual acceptance/penalties/deductions may be decided as per contract provisions by the project authorities.

The question here is that on what ground penalties/deductions shall be effected once the Structural adequacy is established? What is beyond the Structural adequacy the code is looking for?