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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Last previous edition C 42 — Combining values of the two units may result in nonconformance.

ACI provides core strength acceptance criteria for new construction. C 39 with the addition of the following information: Cores for Compressive Strength 7. Ast, the average diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen.

Cap or grind the cores, and test them within 48 h of receipt. Significance and Use 3. 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 preferred length of the capped specimen is between 1.

Core specimens with length-to-diameter ratios less than 1. Current edition approved Feb. BoxFarmington Hills, MI A number in parentheses indicates the year of last reapproval.

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.

If the ratio of the length to the diameter of the core specimen exceeds 2. The acceptance criteria for core strength is to be established by the specifying authority. The values stated may not be exact equivalents, therefore each system must be used independently of the other.

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NOTE 2—Prior to capping, the density of a core may be determined by weighing it and dividing it by awtm volume calculated from the average diameter and length, or by any other standard method for determining density.

ASTM C42-C42M – 04

NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, and elastic modulus. 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. Measure core diameters to the nearest 0. Core diameters less than 3.

CObtaining and Testing Drilled Cores and Sawed Beams of Concrete

SI units are shown in brackets. Ffee standard has been approved for use by agencies of the Department of Defense. 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.

When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster. If this is not practical, removal of concrete can proceed if the cut surfaces do not display erosion of the mortar and the exposed coarse aggregate particles are embedded firmly in the mortar. 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 qstm edges of a unit of deposit.

When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0. Originally published as C 42 — 21 T. Average values are given in the table.

ASTM CC42M – 04 – Free Download PDF

A superscript epsilon e indicates an editorial change since the last revision or reapproval. When grinding or capping of the bearing surfaces is.

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The ends shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Practice C Additionally, this method may be used to axtm strength information on older structures.

Length of Drilled Cores 6.

Do not use specimens with projections or depressions greater than 0. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine adtm applicability of regulatory limitations prior to use. Thus, these factors should be applied to high-strength concrete with caution. 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 atm in.

If necessary, saw the ends of the specimens until the following requirements are met: In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples.

If time permits, the concrete should not be removed before it is 14 days old. Livro sobre Cimento Portland e Concreto.

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. They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa].

Measure the lengths of such cores in accordance with Test Method C Parte 1 de 2 Designation: For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. Ends are not to be capped.