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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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 ashm concrete. ACI provides core strength acceptance criteria for new construction.

The preferred length of the capped specimen is between 1. SI units are shown in brackets.

For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. If necessary, saw the ends fdee the specimens until the following requirements are met: Livro sobre Cimento Portland e Concreto. Core specimens with length-to-diameter ratios less than 1. Core diameters less than 3. When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0.

Ends are not to be capped. Originally published as C 42 — 21 T. C 39 with the addition of the following information: Combining values of the two units may result in nonconformance. Measure core diameters to the fres 0. The ends shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Practice C Determine the average c24 by averaging two measurements taken at right angles to each other about the midheight of the specimen.

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This astmm has been approved for use by agencies of the Department of Defense.

Cores for Compressive Strength 7. If time permits, the concrete should not be removed before it is 14 days old. When grinding or capping of the bearing surfaces is. NOTE 1—It is not possible to specify a minimum age when concrete is strong enough to withstand damage during removal, because the asttm at any age depends on the curing history and strength grade of the concrete.

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. Cap or grind the cores, and test them within 48 h of receipt. They are applicable to both dry and wet concrete for strengths between v42 psi [14 to 42 MPa].

In-place test methods may c422 used to estimate the level of strength development prior to attempting removal of concrete samples. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

The saw shall have a diamond or silicon-carbide cutting edge and shall be capable of cutting specimens which feee to the prescribed dimensions, without excessive heating or shock.

CObtaining and Testing Drilled Cores and Sawed Beams of Concrete

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.

Current edition approved Feb. Measure the lengths of such cores in accordance with Test Method C 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. Do not use specimens with projections or depressions greater than 0. Parte astk de 2 Designation: Additionally, this method may be used to provide strength information on older structures.

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Thus, these factors should be applied to high-strength concrete with caution. Sampling and sample preparation requirements are given to ensure that dimensional requirements are met and that the specimens are comprised of intact sound concrete wstm free of flaws as the particular structure will allow.

Significance and Use 3. When capping is employed the caps shall frew as thin as practicable and shall be formed of high-strength gypsum plaster. 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.

ASTM C42-C42M – 04

C4Farmington Hills, MI Average values are given in the table. The values stated may not be exact equivalents, therefore each system must be used independently of the other. A number in parentheses indicates the year of last reapproval.

Length of Drilled Cores 6. NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, and aztm modulus. 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. Last previous edition C 42 — 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.