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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C39M – 16 – Compressive Strength of Cylindrical NOTE xstm some instances, astj containers may have to be supported above the subgrade to prevent displacement during discharge. 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.

ASTM C Standard

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Obtain these portions within the time limit specified in Section 4.

Complete these tests expeditiously. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The size of the samples shall be dictated by the maximum aggregate size.

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Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 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. 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.

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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. Combining values from the two systems may result in non-conformance with the standard.

ASTM C | Testing Services | Standard Practice for Sampling Freshly Mixed Concrete

Scrape any mortar adhering to the sides of the wet-sieving equipment into the batch. Start molding specimens for strength tests within 15 min after fabricating the composite sample. 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. After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5.

ASTM C172 – Sampling Fresh Concrete

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.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in f172 standard. Work Item s – proposed revisions of this standard.

Do not obtain portions of the composite sample from the very first or last part of the batch discharge Note 3. Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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Originally approved in The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of the total concrete in larger appropriate size specimens. Parte 1 de 2 Designation: 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. For example, wet-sieving concrete causes the loss of a small amount of air due to additional handling.

This removal of larger aggregate particles is preferably accomplished by wet-sieving.

This shall be done before remixing. CM – 12 – Microscopical Determination of Take care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation.

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. 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.

Combine into one composite sample for testing purposes.