The values stated may not be exact equivalents, therefore each system must be used independently of the other. Measure the lengths of such cores in accordance with Test Method C Sampling and sample preparation requirements are given to ensure that dimensional requirements are met and that the specimens are comprised of intact sound concrete as free of flaws as the particular structure will allow. They are applicable to both dry and wet concrete for strengths between and psi.
Last previous edition C 42 - Therefore, c442 of two properly conducted tests on cores sampled from the same hardened concrete where a single test is defined as the average of two observations coreseach made on separate adjacent drilled 4 in.Ĭ 39 with the addition of the following information: Cores for Compressive Strength 7. The aastm shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Practice C Average values are given in the table.ĭIBUJO TECNICO BASICO HENRY CECIL SPENCER PDF Combining values of the two units may result in nonconformance.Ĭap or grind the cores, and test them within 48 h of receipt. Parte 1 de 2 Designation: BoxFarmington Hills, MI Current edition approved Feb. NOTE 3-Correction factors depend on various conditions such as moisture condition, strength level, and elastic modulus. The saw shall have a diamond fdee silicon-carbide xstm edge and shall be capable of cutting specimens which conform to the prescribed dimensions, without excessive heating or shock. Thus, these factors should be applied to high-strength concrete with caution. When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster. If time permits, the concrete should not be removed before aetm is 14 days old. The preferred length of the capped specimen is between 1. ACI provides core strength acceptance criteria for new construction. The acceptance criteria for core strength is to be established by the specifying authority. Determine time from start until no free water is on ASTM C42, Coring, 3 cores/5, sf. ASTM C Potential Resistance to Degradation. ASTM C42/C42M () Standard Test Method for Obtaining and Testing Drilled ASTM International, West Conshohocken. of core test results.2 and that is free of is the individual responsible for analysis or. This standard is issued under the fixed designation C42/C42M the number.