C42 / C42Ma Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Standard + Redline PDF Bundle, 14, $, ADD TO CART. 1 This test method is under the jurisdiction of ASTM Committee C09 on. Concrete .. Drilled Cores in Accordance with ASTM C42,” ASTM Journal of Cement. ASTM CC42M - 04 - Free download as PDF File .pdf), Text File .txt) or read online for free.
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ASTM C - Download as PDF File .pdf), Text File .txt) or read online. This standard is issued under the ﬁxed designation C42/C42M; the number. ) and ASTM C42 (Ref. ) formed the basis the user to monitor and adjust the load rate to satisfy ASTM C39 (Ref. ) requirements. Home; ASTM C42/C42Ma. $; Add to Cart. Printed Edition + PDF;; Immediate download; $; Add to Cart.
Use pachometer to avoid rebar 2. Length to diameter ratio of between 1. Nominal core diameter greater than or equal to 3 x MSA 4.
Scope 1. Within the text, the SI units are shown in brackets. Procedure Checklist. Dampen the interior of the slump mold. Place the mold on a rigid, flat, level, moist, nonabsorbent surface, free of vibration, that is large enough to contain all of the slumped concrete. Standard designations usually consist of a letter prefix and a sequentially assigned number.
This may optionally be followed by a dash and the last two digits of the year in which the standard was adopted. Two concrete test machine s are available for use in FSEL. Revised: Septem C. Roberts Procedure Checklist.
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Revision Level. Modification Type. Test Property. Compressive strength. The relationship is affected by many factors such as the strength level of the concrete, the in-place temperature and moisture histories, the degree of consolidation, batch-to-batch variabil- ity, the strength-gain characteristics of the concrete, the con- dition of the coring apparatus, and the care used in removing cores.
NOTE 2A procedure is available for estimating the equivalent cylin- der strength from a measured core strength.
An example of acceptance criteria for core strength is provided in ACI , 5 evaluate cores taken to investigate low strength test results of standard- cured cylinder during construction. Apparatus 4.
The saw shall have a diamond or silicon-carbide cutting edge and shall be capable of cutting cores without introducing cracks or dislodging aggre- gate particles. Sampling 5.
When preparing strength test specimens from samples of hardened concrete, samples that have been damaged during removal shall not be used unless the damaged portion s are removed and the lengths of resulting test specimens satisfy the minimum length-diameter ratio requirement in 7.
Samples of defective or damaged concrete that cannot be tested shall be reported along with the reason that prohibits use of the sample for preparing strength test specimens. NOTE 6It 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 time permits, the concrete should not be removed before it is 14 days old.
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 rmly in the mortar. In-place test methods may be used to estimate the level of strength development prior to attempting removal of concrete samples.
If a core tested for strength contains embedded metal, the size, shape, and location of the metal within the core shall be documented in the test report. NOTE 7The presence of steel reinforcement, other than bers, or other embedded metal in a core can affect the measured strength.
If testing of cores containing embedded reinforce- ment is permitted, engineering judgment is required to assess the signicance of the results. The specier of the tests should not permit a core to be tested for strength if bar reinforcement, or other elongated embedded metal object, is oriented close to parallel to the core axis. This minimum distance does not apply to the formed boundaries of structural members.