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

Length feee Drilled Cores 6. 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.

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. Thus, these factors should be applied to high-strength concrete with caution. If time permits, the concrete should not be removed before it is 14 days old.

The values stated may not be exact equivalents, therefore each system must be used independently of the other. When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0.

The acceptance freee for core strength is to be established by the specifying authority. A superscript epsilon e indicates an editorial change since the last revision or reapproval.


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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.

Do not use specimens with projections or depressions greater than 0.

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 of a unit of deposit.

When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster. Combining asfm of the two units may result in nonconformance.

CObtaining and Testing Drilled Cores and Sawed Beams of Concrete

For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. The preferred length of the capped specimen is between 1. Livro sobre Cimento Portland e Concreto. Ends are not to be capped. Determine the average diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen.

Parte 1 de 2 Designation: When grinding or capping of the bearing surfaces is.

Core specimens with length-to-diameter ratios less than 1. C 39 with the addition of the following information: Cores for Compressive Frree 7. The saw shall have a diamond 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. NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, and elastic modulus.

ASTM CC42M – 04 – Free Download PDF

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. If necessary, saw the ends of the specimens until the following requirements are met: Additionally, this method may be used to provide strength information on older structures.

This standard frde been approved for use by agencies of the Department of Defense. If the feee of the length to the diameter of the core specimen exceeds 2.

If this is not practical, removal of concrete can proceed free the cut surfaces do not display erosion of the mortar and the exposed coarse aggregate particles are embedded firmly in the mortar. Current edition approved Feb.

The relationship is affected by many factors such as the strength level of the concrete, the in-place temperature and moisture history, and the strength gain characteristics of the concrete.