This standard is issued under the fixed designation C42/C42M; the number . of core test results.2 and that is free of is the individual responsible for analysis or. ASTM C42/C42M () Standard Test Method for Obtaining and Testing Drilled ASTM International, West Conshohocken. Free SCIRP Newsletters>> . ASTM C Potential Resistance to Degradation. In-situ Tests . Determine time from start until no free water is on ASTM C42, Coring, 3 cores/5, sf.

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ACI provides core strength acceptance criteria for ast construction. Parte 1 de 2 Designation: A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Length of Drilled Cores 6. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

If time permits, the concrete should not be removed before it is 14 days old. If this is not practical, removal of concrete can proceed if the cut surfaces do not display erosion of the mortar and the exposed c442 aggregate particles are embedded firmly in the mortar.

ASTM C42-C42M – 04

Average values are given in the table. In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples. The values stated may not be exact equivalents, therefore each system must be used independently of the other. BoxFarmington Hills, MI SI units are shown in brackets. Combining values of the two units may result in nonconformance.

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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. Ends are not to be capped. Current ast approved Feb.

ASTM CC42M – 04 – Free Download PDF

When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster. A specimen taken perpendicular to a vertical surface, or perpendicular to a surface with a batter, shall be taken from near the middle of a unit of deposit when possible and not near formed joints or obvious edges atm a unit of deposit.

Therefore, results of two properly conducted tests on cores sampled from the same hardened concrete where a single frre is defined as the average of two observations coreseach made on separate adjacent drilled 4 in. Additionally, this method may be used to provide strength information on older structures. Thus, these factors should be applied to high-strength concrete with caution. Last previous edition C4 42 — Core diameters less than 3. A number in parentheses indicates the year of last reapproval.

When the line of d42 is not straight or contains projections or depressions having heights or depths greater than 0. NOTE 1—It is not possible to specify a minimum age when concrete is strong enough to withstand damage during removal, because the strength at any age depends on the curing history and strength grade fgee the concrete. Livro sobre Cimento Portland e Concreto.

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The acceptance criteria for core strength is to be established by the specifying authority. When preparing strength test specimens from samples of hardened concrete, samples that show defects or samples that have been damaged in the process of removal shall not be used.

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When grinding or capping of the bearing surfaces is. The saw shall have a diamond or silicon-carbide cutting edge f42 shall be capable of cutting specimens which conform to the prescribed dimensions, without excessive heating or shock.

The ends shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Practice C They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa]. astk

For strengths above psi [70 MPa], test data on cores show ast the correction factors may be larger than the values listed above. Measure the lengths of such cores in accordance with Test Method C