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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A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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 of the concrete. The ends shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Practice C Cap or grind the cores, and test them within 48 h of receipt.

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 asfm deposit when possible and not near formed joints or obvious edges of a unit of deposit.

ASTM C42-C42M – 04

A number in parentheses indicates the year of last reapproval. If necessary, aatm the ends of the specimens until the following requirements are met: Significance and Use 3.


The acceptance criteria for core strength is to be established by the specifying authority. When capping is employed the caps shall astn as thin as practicable and shall be formed of high-strength gypsum plaster. Additionally, this method may be used to provide strength information on older structures.

Last previous edition C 42 — Therefore, results 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. Average values are given in the table. If time permits, the concrete should not be removed before it is 14 days old. The relationship is affected by many factors such as the strength level of the concrete, the in-place temperature sstm moisture history, and the strength gain characteristics of the concrete.

ASTM CC42M – 04 – Free Download PDF

For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. NOTE 2—Prior to capping, the density of a core may be determined by weighing it and dividing it by the volume calculated from the average diameter and length, or by any other standard method for determining density.

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. Originally published as C 42 — 21 T.


Ends are not to be capped. Livro sobre Cimento Portland e Concreto. Combining values of the two units may result in nonconformance.

Thus, these factors should be applied to high-strength concrete with caution. When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0. This standard has been approved for use by agencies of the Department of Defense.

Parte 1 de 2 Designation: SI units are shown in brackets. In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples.

C42-Obtaining and Testing Drilled Cores and Sawed Beams of Concrete

The saw shall have a cc42 or silicon-carbide cutting edge and shall be capable of cutting specimens which conform to the prescribed dimensions, without excessive heating or shock. Measure core diameters to the nearest 0.

C 39 with the addition of the following information: The values stated may not be exact equivalents, therefore each system must be used independently of the other. Length of Drilled Cores 6. Fere preparing strength test specimens from samples of hardened concrete, samples that show defects or samples that have been damaged in the frde of removal shall not be used. Do not use specimens with projections or depressions greater than 0.

Current edition approved Feb.