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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. Statistical concepts described are applicable for the analysis of other common concrete test results, including ...
ACI 301 Section 4 Covers Concrete Mixtures and Provides Guidance for the Following: General. Scope Submittals Quality Control. Products.
The 28 days concrete test results are accepted as standard compressive strength values. The compressive strength acceptance is specified by 26.12.3.1 of ACI 318-14 as : Average of three compressive tests results should be equal to or more than the specified strength.
12 Ιουλ 2017 · A test that has been standardized by ASTM C39 is used to determine the compressive strength ( fc′) of concrete. The test involves compression loading to failure of a specimen cylinder of concrete. The compressive strength so determined is the highest compressive stress to which the specimen is subjected.
