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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Thus, these factors should be applied to high-strength concrete with caution. If the ratio of the length to the diameter of the core specimen exceeds 2. Measure core diameters to the nearest 0. If necessary, saw the ends of the specimens until the following requirements are met: Significance and Use 3. SI units are shown in brackets. Cores for Compressive Strength 7. This standard has been approved for use by agencies of the Department of Defense.

The preferred length of the capped specimen is between 1. Core diameters less than 3. BoxFarmington Hills, MI Livro sobre Cimento Portland e Concreto. They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa]. Last previous edition C 42 — Average values are given in the table.

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.

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. The ends shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Practice C When grinding or capping of the bearing surfaces is.

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ASTM CC42M – 04 – Free Download PDF

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Parte 1 de 2 Designation: Ends are not to be capped. 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 When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0.

Determine the average diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen. Do not use specimens with projections or depressions greater than 0. 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 cree characteristics of the concrete.

If this is not practical, removal of concrete can proceed if the cut surfaces do not display erosion of the mortar and aetm exposed coarse aggregate particles are embedded firmly in the mortar. Combining values asmt the two units may result in nonconformance.

Core specimens with length-to-diameter ratios less than 1. 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. Length of C4 Cores 6. 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.

ASTM C42-C42M – 04

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. 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.


Originally published as Aetm 42 — 21 T. NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, fred elastic modulus. The acceptance criteria for core strength is to be established by the specifying authority.

When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster.

Cap or grind the cores, and test them within 48 h of receipt.

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

Sampling and sample preparation requirements are given to ensure tree dimensional requirements are met and that the specimens are comprised of intact sound concrete as free of flaws as the particular structure will allow. ACI provides core strength acceptance criteria for new construction.

In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples. Current edition approved Feb. Additionally, this method may be used to provide strength information fee older structures.

A number in parentheses indicates the year of last reapproval. For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. If time permits, the concrete should not be asym before it is 14 days old. NOTE 1—It is not possible to specify a minimum age when concrete is astmm enough to withstand damage during removal, because the strength at any age depends on the curing history and strength grade of the concrete.

C 39 with the addition of the following information: