Core preparation and testing requirements are outlined in Section 26.12.6.1 of ACI 318-19. In such cases, three cores must be taken for each strength test that falls below the specified compressive strength by more than the limit allowed for acceptance. Section 26.12.6.1 states that if the likelihood of low-strength concrete is confirmed and calculations indicate that structural adequacy is significantly reduced, tests of cores drilled from the area in question in accordance with ASTM C42 “ Standard Test Method of Obtaining and Testing Drilled Cores and Sawed Beams in Concrete” shall be permitted. Or if tests of field-cured cylinders indicate deficiencies in protection and curing, steps shall be taken to ensure that structural adequacy of the structure is not jeopardized. Section 26.12.6.1 of ACI 318-19 states that if any strength test of standard-cured cylinders falls below the specified compressive strength by more than the limit allowed for acceptance, If a structure is being built in accordance with the requirements of ACI 318-19, what must be done when a low-strength test occurs?Ī.
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