Astm standards for concrete testing10/5/2023 ![]() However, 3- and 7-day test results are not commonly used for acceptance purposes. 3- or 7-day test results are used to monitor early strength gain, especially when high early-strength concrete is used. ![]() According to section 19.2.1.3 of ACI 318-19 the specified compressive strength shall be based on the 28-day test results unless otherwise specified in the construction documents. What ACI standard stipulates the percent of the specified compressive strength that the cylinder must meet in order to pass the compressive strength test at both the 7- and 28-day ages?Ī. Standards for 7-day and 28-day strength test results
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