ASTM C Related for sampling of fresh concrete on which tests are to be performed to determine compliance with specific test methods in ASTM standards . Materials. Sampling. Testing. C Cement. C Agg. C Air. C Admix. C Ash. C Water. C Sampling Fresh Concrete. ACI C Sampling Freshly Mixed Concrete – Free download as PDF File 1 This practice is under the jurisdiction of ASTM Committee C09 on Concrete.
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Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: The detailed requirements as to materials, mixtures, air content, temperature, number of specimens, slump, interpretation of results, and precision and bias are in specific test methods.
ASTM C / CM – 17 Standard Practice for Sampling Freshly Mixed Concrete
The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of the total concrete in larger appropriate size specimens. Regulate the rate of discharge of the batch by the rate of revolution of the drum and not by the size c72 the gate opening.
To preclude contamination or absorption by the subgrade, sample the concrete by placing three shallow containers on the subgrade and discharging the concrete across the container. The containers shall be of a size sufficient to provide a composite sample size that is in agreement with the maximum aggregate size.
ASTM Volume C39M – 16 – Compressive Strength of Cylindrical Generally, a horizontal back and forth motion is preferred. Originally approved in In any case do not obtain samples until after all of the water and any admixtures have been added to the mixer; also do not obtain samples from the very first or last portions of the batch discharge Note 3.
Mixers—Sample the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
If discharge of the concrete is too rapid to divert the complete discharge stream, discharge the concrete into a container or transportation unit sufficiently large to accommodate the entire batch and then accomplish the sampling in the same manner as given above.
Link to Active This link will f172 route to the current Active version of the standard. Expeditiously c127 and use the sample and protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination. The air content of the wet-sieved fraction of concrete is greater than that of the total concrete because the larger size aggregate which is removed does not contain air.
This removal of larger aggregate particles is preferably accomplished by wet-sieving. Composite samples are required by this practice, unless specifically excepted by procedures governing the tests to be performed such as tests to determine uniformity of consistency and mixer efficiency.
The detailed requirements as to materials, mixtures, air content, temperature, number of specimens, slump, interpretation of results, and precision and bias are in asmt test methods. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. This standard is subject c17 revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
A number in parentheses indicates the year of sstm reapproval.
ASTM C172.C172M – 14 – Sampling Freshly Mixed Concrete
Combining values from the two systems may result in non-conformance with the standard. Procedures used to select the specific test batches are not described in this practice, but it is recommended that random sampling be used to determine overall specification compliance. NOTE x172 some instances, the containers may have to be supported above the subgrade to prevent displacement during discharge.
Current edition approved Oct. Approved October 1, Combine into one composite sample for testing purposes. Qstm the concrete at the frequency specified by collecting two or more portions aetm at regularly spaced intervals during v172 of the concrete. Shake or vibrate the sieve by hand or mechanical means until no undersize material remains on the sieve. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
ASTM C Standard
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. NOTE 5—The waiting period c17 to commencing the testing is needed because the mix water is input only seconds before discharge from the continuous mixer. Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade.