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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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.

They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa]. Determine the average diameter by averaging two measurements taken at right angles to each other about the midheight of the qstm.

Combining values of the two units may result in nonconformance. BoxFarmington Hills, MI 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. Thus, these factors should be applied to high-strength concrete with caution.

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 conform to the prescribed dimensions, without excessive heating or shock. The values stated may not be exact equivalents, therefore each system must be used asgm of the other.

ASTM CC42M – 04 – Free Download PDF

C 39 with the addition of the following information: Average values are given in the table. The relationship is affected by many factors such as astmm strength level of the concrete, the in-place temperature and moisture history, and the strength gain characteristics of the concrete. NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, and elastic modulus. For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above.


Core specimens with length-to-diameter ratios less than 1. When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0. Do not use specimens with projections or depressions greater than 0.

Measure core diameters to the nearest 0. ACI provides core strength acceptance criteria for new construction. Length of Drilled Cores 6. Significance and Use 3. Ends are not to be capped. Cap or grind the cores, and test them within 48 h of receipt.

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 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.

SI units are shown in brackets. Parte 1 de 2 Designation: The acceptance criteria for core strength is to be established by the specifying authority.

If necessary, saw the ends of the specimens until the following requirements are met: Livro sobre Cimento Portland e Concreto.

CObtaining and Testing Drilled Cores and Sawed Beams of Concrete

This standard has been approved for use by agencies of the Department of Defense. Cores for Compressive Strength 7. The preferred length of the capped specimen is between 1. If time permits, the concrete should not be removed before it is 14 days old.


In-place test methods may be used to aztm the level of strength asym prior to attempting removal of concrete samples. When grinding or capping of the bearing surfaces is. Originally published as C 42 — 21 T.

If the ratio of the length to the diameter of the core specimen exceeds 2. 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 fres coreseach made on separate adjacent drilled 4 in. 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.

Measure astn lengths of such cores in accordance with Test Method C Core diameters less than 3. 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.

Additionally, this method may be used to provide strength information on older structures. A number in parentheses indicates the year of last reapproval.

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.