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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Originally published as C 42 — 21 T. ACI provides core strength acceptance criteria for new construction. Combining values of the two units may result in nonconformance. The acceptance criteria for core strength is to be established by the specifying authority.

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. If the ratio of the length to the diameter of the core specimen exceeds 2. In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples. Thus, these frew should be applied to high-strength concrete with caution.

Ends are not to be capped.

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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 aastm in. 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.



adtm When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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 diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen.

C 39 with the addition of the following information: Parte 1 de 2 Designation: The preferred length of the capped specimen is between 1. For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above.

Livro sobre Cimento Portland e Concreto. 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.

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

ASTM CC42M – 04 – Free Download PDF

Cap or grind the cores, and test them within 48 h of frse. Average values are given in the table. 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.


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 c24 embedded firmly in the mortar.

This standard has been approved for use by agencies of the Department of Defense. When grinding or capping of the bearing surfaces is.

ASTM C42-C42M – 04

Additionally, this method may be used to provide strength information on older structures. 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.

Core specimens with length-to-diameter ratios less than 1. Cores for Compressive D42 7. Length of Drilled Cores 6.

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