28 Jan ASTM C Sampling Freshly Mixed Concrete. P. F. N/A. Procedure. 1. Obtain a representative sample source (i.e. revolving drum truck mixer). Referenced Documents ASTM Standards: 3 E 11 Speciﬁcation for Wire-Cloth and Sieves for Testing Purposes 3. Signiﬁcance and Use This practice is. Performance Examination Checklist — ASTM C Sampling (PERFORMANCE) . ACI Concrete Field Testing Technician—Grade I. Page 1 of 1. Examinee.
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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. Combining values from the two systems may result in non-conformance with the standard. Sample the concrete at the frequency specified by collecting two or more portions taken asrm regularly spaced c72 during discharge of the concrete.
This removal of larger aggregate particles is preferably accomplished by wet-sieving.
They shall be combined and remixed with a shovel asym minimum amount necessary to ensure uniformity and compliance with the maximum time limits specified in 4. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
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. Obtain these portions within the time limit specified in Section 4. The equipment shall be capable of rapidly and effectively removing the designated size of aggregate.
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. C39M – 16 – Compressive Strength of Cylindrical 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.
Active Risk Management
No further reproductions authorized. 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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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.
ASTM C Standard
Complete these tests expeditiously. Smaller samples are not prohibited for routine air content, temperature, and slump tests. 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.
Scrape any mortar adhering to the sides of the wet-sieving equipment into the batch. These qstm apply to both tilting and nontilting mixers. Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container. The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of ast, total concrete in larger appropriate size specimens.
Perform sampling by passing a receptacle completely through the discharge stream, or by completely diverting the discharge into a sample container. Obtain samples from at least five different portions of the pile and combine them into one composite sample for test purposes. NOTE 1—Composite samples are required by this practice, unless specifically excepted by procedures governing the tests to be performed such as tests to astk uniformity of consistency and mixer efficiency.
The effect of these differences may need to be considered or determined by supplementary testing for quality control or test result evaluation purposes. 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.
Historical Version s – view previous versions of standard. This shall be done before remixing. A number in parentheses indicates the year of last reapproval. Current edition adtm Oct. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided c17 part of the standard. NOTE 6—The effect of wet-sieving on the test results should be considered. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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 aetm and mixer efficiency.