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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CObtaining and Testing Drilled Cores and Sawed Beams of Concrete
They are applicable to both dry and wet concrete for strengths between and psi [14 to 42 MPa]. 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. Core diameters less than 3. Thus, these factors should be applied to high-strength concrete with caution.
Ends are not to be capped. Originally published as C 42 — 21 T.
This standard has been approved for use by agencies of the Department of Defense. Measure core diameters to the nearest 0. 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.
C42-Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
Cap or grind the cores, and test them within 48 h of receipt. In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples.
When capping is employed the caps shall be as thin as practicable and shall be formed cree high-strength gypsum plaster. The preferred length of the capped specimen is between 1. 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.
BoxFarmington Hills, MI Livro sobre Cimento Portland e Concreto. 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 frse in. C 39 with the addition of the following information: Average values are given in the table.
Do not use specimens with projections or depressions greater than 0. The ends shall be sawed or ground to tolerance or capped in accordance with capping procedures for hardened concrete specimens of Frde C 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. Core specimens with length-to-diameter ratios less than 1.
Determine the average diameter by averaging two measurements taken at right angles to each other about the midheight of the specimen. When grinding or capping of freee bearing surfaces is.
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If necessary, saw the ends of the specimens until the following requirements are met: Combining values of the two units may result in nonconformance. 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.
If the ratio of the length to the diameter of the core specimen exceeds 2.
For strengths above psi [70 MPa], test data on cores show that the correction factors may be larger than the values listed above. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Additionally, this method may be used to provide strength information on older structures. 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 cree structure will allow.
Length of Drilled Cores 6. Parte 1 de 2 Designation: The acceptance criteria for core strength is to be established by the specifying authority. cree
ASTM CC42M – 04 – Free Download PDF
NOTE 3—Correction factors depend on various conditions such as moisture condition, strength level, and elastic modulus. 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. ACI provides ffree strength acceptance criteria for new construction. Significance and Use 3. A number in parentheses indicates the year of last reapproval.
Cores for Compressive Strength 7.
Last previous edition C 42 —