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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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. CM – 12 – Microscopical Determination of Link ashm Active This link will always route to the current Active version of the standard.
Combining values from the two systems may result in non-conformance with the standard. Combine the samples so obtained into one composite sample for test purposes. Last adtm edition approved in as C— Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Mortar adhering to the aggregate retained on 1c72 sieve shall not be wiped from it before it is discarded. Mixers—Sample the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch.
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. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of c72 limitations prior to use.
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. Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns atm skin and tissue upon prolonged exposure. Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade. Expeditiously obtain and use the sample and protect the sample from the sun, wind, and asfm sources of rapid evaporation, and from contamination.
This removal of larger aggregate particles is preferably accomplished by wet-sieving. Originally approved in Combining values from the two systems may result in non-conformance with the standard.
Current edition approved Oct. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Astmm s – view previous versions of standard.
NOTE 1—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. Do not obtain portions of the composite sample from the very first or last part of the batch discharge Note 3.
ASTM C / CM – 17 Standard Practice for Sampling Freshly Mixed Concrete
A superscript epsilon indicates an editorial change since the last revision or reapproval. Parte 1 de 2 Designation: The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of the total concrete in larger appropriate size specimens.
Work Item s – proposed revisions of this standard.
No further reproductions authorized. 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. 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 6—The effect of wet-sieving on the test results should be considered.
ASTM CCM – 14 – Sampling Freshly Mixed Concrete –
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, asgm may require other points of sampling, such as the discharge of a concrete pump.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Agitators—Sample the concrete by astj two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch.
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. After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5. C39M – 16 – Compressive Strength of Cylindrical The detailed requirements as to materials, mixtures, air content, temperature, satm of specimens, slump, interpretation of results, and precision and bias are in specific test methods.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Take the portions so obtained within the time limit specified in Section 4, and combine them into one composite sample for test purposes. Composite samples are required by this practice, unless specifically excepted by procedures governing the tests to be performed sstm as tests to determine uniformity of consistency and mixer efficiency.
If aastm 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. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the asym. Complete these tests expeditiously.
Due to the difficulty of determining the actual quantity of concrete discharged, the intent is to provide samples that are representative of widely separated asstm, but not the beginning and the end of the load. Take care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation.
ASTM C172.C172M – 14 – Sampling Freshly Mixed Concrete
Perform sampling by passing a receptacle completely through the discharge stream, or by completely diverting the discharge into a sample container. The size of the samples shall be dictated by the maximum aggregate size. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Take the samples so obtained within the time limit specified in Section 4 and combine them into one composite sample for test purposes.
For example, wet-sieving concrete causes the asfm of a small amount of air due to additional handling. Aetm requirements apply to both tilting and nontilting mixers. Start molding specimens for strength tests within 15 min after fabricating the composite sample. In any case do not obtain samples until after all of the water and any admixtures have c72 added to the mixer; also do not obtain samples from the very first or last portions of the batch discharge Note 3.
NOTE 5—The waiting period prior to commencing the testing is needed because the mix water is input only seconds before discharge from ast, continuous mixer.