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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If necessary, saw the ends of the specimens until the following requirements are met: 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.

Livro sobre Cimento Portland e Concreto. Current edition approved Feb.

ASTM CC42M – 04 – Free Download PDF

C 39 with the addition of the following information: Significance and Use 3. Length of Drilled Cores 6.

Thus, these factors should be applied to high-strength concrete with caution. SI units are shown in brackets. 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.

Measure the lengths of such cores in accordance with Test Method C When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster. Cores for Compressive Strength 7. If time permits, the concrete should not be removed before it is 14 days old.


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. NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, and elastic modulus.

The acceptance criteria for core strength is to be established by the specifying authority. Additionally, this method may be used to provide strength information on older structures. Determine the average diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen.

CObtaining and Testing Drilled Cores and Sawed Beams of Concrete

For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. 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.

In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples. They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa]. Parte 1 de 2 Designation: When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0. Combining values of the two units may result in nonconformance. Do not use specimens with projections or depressions greater than 0.

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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.

Core diameters less than 3. ACI provides core strength acceptance criteria for new construction.

If the ratio of the length to the diameter of the core specimen exceeds 2. Average values are given in the table. 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. ashm

BoxFarmington Hills, MI Last previous edition C 42 — Sampling and sample preparation requirements are given fres 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. Ends are not to be capped.

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

Cap or grind the cores, and test them within 48 h of receipt. Originally published as C 42 — 21 T. When grinding or capping of the bearing surfaces is. The saw shall have a diamond or silicon-carbide cutting edge and shall be capable of frre specimens which conform to the prescribed dimensions, without excessive heating or shock.

The preferred length of the capped specimen is between 1. Measure core diameters to the nearest 0.

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