ASTM C172 PDF

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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Expeditiously obtain and use the sample and protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination. Scrape any mortar adhering to the sides of the wet-sieving equipment into the batch. The equipment shall be capable of rapidly and effectively removing the designated size of aggregate.

Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. Combine the samples so obtained into one composite sample for test purposes. The effect of these differences may need to be considered or determined by supplementary testing for quality control or test result evaluation purposes.

ASTM CCM – 14 – Sampling Freshly Mixed Concrete –

This shall be done before remixing. The detailed cc172 as to materials, mixtures, air content, temperature, number of specimens, slump, interpretation of results, and precision and bias are in specific test methods.

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. Sample the concrete at the frequency specified by collecting two or more portions taken at regularly spaced intervals during discharge of the concrete.

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. NOTE 6—The effect of wet-sieving on the test results should be considered. A number in parentheses indicates the year of last reapproval.

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CM – 12 – Microscopical Determination of 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.

Take care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation. The values stated aztm each system may not be exact equivalents; therefore, each system shall be used independently of the other. Obtain samples from at least five different portions of the pile and combine them into one composite sample for test purposes.

Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade. ASTM Volume 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 c72.

Procedures used to select the astn test batches are not described in zstm practice, ashm it is recommended that random sampling be used to determine overall specification compliance. Link to Active This link will always route to the current Active version of the standard.

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. The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of the total concrete in larger appropriate size specimens. Complete these tests expeditiously.

Martins, Damasceno, Awada – Pronto-socorro Pronto-socorro: Smaller samples are not prohibited for routine air content, temperature, and slump tests. Due to the difficulty of determining the actual quantity of concrete discharged, the intent is to provide samples that are representative of widely separated portions, but not the beginning and the end of the load.

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Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. Agitators—Sample the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch. NOTE 4—In some instances, the containers may have to be supported above the subgrade to prevent displacement during discharge.

Active Risk Management

After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5. Take axtm portions so c1722 within the time limit specified in Section 4, and combine them into one composite sample for test purposes. 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.

Start molding specimens for strength tests within 15 min after fabricating the composite sample. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone cc172, faxor service astm.

The containers shall be of a size sufficient to provide a composite sample size that is in agreement with the maximum aggregate size.

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.