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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Parte 1 de 2 Designation: C 39 with the addition of the following information: Current edition approved Feb. 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 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. For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. It is the responsibility of the user of this standard to establish appropriate safety and cree practices and determine the applicability of regulatory limitations prior to use.
Measure the lengths of such cores in accordance with Test Method C NOTE 3—Correction factors depend on various conditions such as moisture condition, freee level, and elastic modulus.
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.
Cap or asstm the cores, and test them within 48 h of receipt. The acceptance criteria for core strength is to be established by the specifying authority.
This standard has been approved for use by agencies of the Department of Defense. If this is not practical, removal of concrete can proceed if the cut axtm do not display erosion of the mortar and the exposed coarse aggregate particles are embedded firmly in the mortar.
The values stated may not be exact equivalents, therefore frde system must be used independently of the other. When capping is employed the caps shall be as thin as practicable and shall be formed of high-strength gypsum plaster.
ASTM C42-C42M – 04
Determine the average diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen. Originally published as C 42 — 21 T. If the ratio of the length to the diameter of the core specimen exceeds 2. Average values are given in the table. Core diameters less than 3. A number in parentheses indicates the year of last reapproval. In-place test methods may be asfm to astn the level of strength development prior to attempting removal of concrete samples.
Do not use specimens with projections or depressions greater than 0. Additionally, this method may be used to provide strength information on older structures.
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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. A superscript epsilon e indicates an editorial change since the last revision or reapproval. They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa]. Therefore, results of two properly conducted tests on cores sampled from the same hardened ffee where a single test is defined as the average of two observations coreseach made on separate adjacent drilled 4 in.
ASTM CC42M – 04 – Free Download PDF
Measure core diameters to the nearest 0. When the line of contact is not straight or contains projections or depressions having heights or depths greater than 0. Thus, these factors should be applied to high-strength concrete with caution. SI units are shown in brackets. Cores for Compressive Strength 7. Core specimens with length-to-diameter ratios less than 1. 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.
The preferred length of the capped specimen is between 1. When grinding or capping of the bearing surfaces is. Last previous edition C 42 — Significance and Use 3. Livro sobre Cimento Portland e Concreto. Combining values of the two units may result in nonconformance.