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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After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5. ASTM Volume 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.
Take care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation. The containers shall be of a size sufficient to provide a composite sample size that is in agreement with the maximum aggregate size. Obtain samples from at least five different portions of the pile and combine them into c712 composite sample for test purposes.
ASTM C172.C172M – 14 – Sampling Freshly Mixed Concrete
NOTE 5—The waiting period prior to commencing the testing is needed because the mix water is input only seconds before discharge from the continuous mixer. 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 size of the samples shall be dictated by the maximum aggregate size. Last previous edition approved in as C— NOTE 6—The effect of wet-sieving on the test results should be considered.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. NOTE 2—Sampling should normally be performed as the concrete is delivered from the mixer to the conveying vehicle used to transport the concrete to the forms; however, specifications may require other points of sampling, such as the discharge of a concrete pump.
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. Take the portions so obtained within the time limit specified in Section 4, and combine them into one composite sample for test purposes.
Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: 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. Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged wstm. Your comments are invited either for revision of this xstm or for additional standards and should be addressed to ASTM International Headquarters.
The values stated in each system may not be exact equivalents; therefore, each system shall be qstm independently of the other. Current edition approved Oct.
Combining values from the two systems may result in non-conformance with the standard. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Regulate the rate of discharge of the batch by the rate of revolution of the drum and not by the size of the gate opening.
Mortar adhering to the aggregate retained on the sieve shall not be wiped from it before it is discarded. These requirements apply to both tilting and nontilting mixers. 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. 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.
Referenced Asstm purchase separately The documents listed below are referenced within the subject standard xstm are not provided as part of the standard.
ASTM CCM – 14 – Sampling Freshly Mixed Concrete –
After removing the larger aggregate particles by wet-sieving remix the batch with a shovel the minimum amount necessary to ensure uniformity and proceed testing immediately. No further reproductions authorized. The equipment shall be capable of rapidly and effectively removing the designated size of aggregate.
Committee C09 has identified the location of selected changes to this practice since the last issue, C—14, that may impact the use of this practice. 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. Work Item s – proposed revisions of ashm standard.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
Shake or vibrate the sieve by hand or mechanical means until no undersize material remains on the sieve. C39M – 16 – Compressive Strength c1172 Cylindrical The concrete which passes the sieve shall fall into a batch pan of suitable size which has been dampened before use or onto a clean, moist, nonabsorbent surface.
Link to Active This link will always route to the current Active version of the standard. NOTE 1—Composite samples are required by this practice, unless specifically excepted by procedures governing aztm tests to be performed such as tests to determine uniformity of consistency and mixer efficiency. Parte 1 de 2 Designation: CM – 12 – Microscopical Determination of A superscript epsilon indicates an editorial change since the last revision or reapproval.
Start molding specimens for strength tests within 15 min after fabricating the composite sample. Generally, a horizontal back and forth motion is preferred.
Active Risk Management
Smaller samples are not prohibited for routine air content, temperature, and slump tests. 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. Expeditiously obtain and use the sample and protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination.
Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.