ASTM C172 PDF

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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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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 values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

NOTE 4—In some instances, the containers may have to be supported above the subgrade to prevent displacement during discharge. These requirements apply to both tilting and nontilting mixers. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently awtm the other.

ASTM C172 – Sampling Fresh Concrete

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. 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. Generally, a horizontal back and forth motion is preferred. 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.

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. Combining values from the two systems may result in non-conformance with the standard. 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. Smaller samples are not prohibited for routine air content, temperature, and slump tests.

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ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Combining values from the two systems may result in non-conformance with the standard. Mixers—Sample the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch.

ASTM CCM – 14 – Sampling Freshly Mixed Concrete –

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. 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.

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. 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.

Asym care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation. Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade.

Start molding specimens for strength tests within 15 min after fabricating the composite sample. The containers shall be of a size sufficient c17 provide a composite sample size that is in agreement with the maximum aggregate size.

This removal of larger aggregate particles is preferably accomplished by wet-sieving. CM – 12 – Microscopical Determination of Agitators—Sample the concrete by collecting two or more portions taken at regularly c17 intervals during discharge of the middle portion of the batch.

C39M – 16 – Compressive Strength of Cylindrical Place only enough concrete on the sieve at any one time so that after sieving, the thickness of the layer of ashm aggregate is not more than one particle thick. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

A number in parentheses indicates the year of last reapproval.

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The size of the samples shall be dictated by the maximum aggregate size. Obtain these portions within the time limit specified in Section 4. 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.

This shall be done before remixing. Complete these tests expeditiously. Last previous edition approved in as C— 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.

Combine the samples so obtained into one composite sample for test purposes.

This removal of larger aggregate particles is preferably accomplished by wet-sieving. Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container.

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. Parte 1 de 2 Designation: Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 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.

If discharge of the concrete is too rapid to astk 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. NOTE 6—The effect of aztm on the test results should be considered. Approved October 1, 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.

ASTM Volume The effect of these differences may need to be considered or determined by supplementary testing for quality control or test result evaluation purposes. Work Item s – proposed revisions of this standard.