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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. 3- or 7-day test results are used to monitor early strength gain, especially when high early-strength concrete is used.
Core testing is the most direct method to determine the in-place compressive strength of concrete in a structure. Generally, cores are obtained to: † Assess, if required, whether concrete in a new structure complies with strength-based acceptance criteria; or † Determine in-place concrete strengths in an existing
Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during the production of concrete, etc. Test for compressive strength is carried out either on a cube or cylinder.
This guide provides an introduction to the evaluation of concrete strength test results. Procedures described are applicable to the compressive strength test results required by ACI 301, ACI 318, and similar specifications and codes.
This manual is intended to guide, assist, and instruct concrete inspectors and others engaged in concrete construction and testing, including field engineers, construction superintendents, supervisors, laboratory and field technicians, and workers.
This test method covers a procedure for making and curing concrete specimens and for testing them at an early age. The specimens are stored under standard or accelerated curing conditions and the...
The procedures described are applicable to the compressive-strength test results required by ACI 301, ACI 318, and other similar specifications and codes. The statistical concepts described are applicable for analysis of other common concrete test results including flexural strength, slump, air content, and density.
