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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM C172 – Sampling Fresh Concrete
CM – 12 – Microscopical Determination of 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.
They shall be combined and remixed with a shovel the minimum amount necessary to ensure uniformity and compliance with the maximum time limits specified in 4.
The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of the total concrete in larger appropriate size specimens. Expeditiously obtain and use the sample and protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination. 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.
Link to 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.
ASTM C / CM – 17 Standard Practice for Sampling Freshly Mixed Concrete
Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 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.
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. This removal of larger aggregate particles is preferably accomplished by wet-sieving.
Last previous edition approved in as C— Obtain samples from at least five different portions of the pile and combine them into one composite sample for test purposes. This shall be done before remixing.
Generally, a horizontal back and forth motion is preferred. 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.
Active Risk Management
The effect of these differences may need to be considered or determined by d172 testing for quality control or test result evaluation purposes. 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.
Astj equipment shall be capable of rapidly and effectively removing the designated size of aggregate. Shake or vibrate the sieve by hand or mechanical means until no undersize material remains on the sieve.
These requirements apply to both tilting and nontilting mixers. The size of the samples shall be dictated by the maximum aggregate size. Perform sampling by passing a receptacle completely through the discharge stream, or by completely sstm the discharge into a sample container. Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container.
Take care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Martins, Damasceno, Awada – Pronto-socorro Pronto-socorro: A superscript epsilon indicates an editorial change since the last revision or reapproval.
NOTE 4—In some astmm, the containers may have to be supported above the subgrade to prevent displacement during discharge.
Parte 1 de 2 Designation: Work Item s – proposed revisions of this standard. Complete these tests expeditiously.
ASTM CCM – 14 – Sampling Freshly Mixed 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. Composite samples are c1722 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. To preclude contamination or absorption by the astj, sample the concrete by placing three shallow containers on the subgrade and discharging the concrete across the container.
Do not obtain portions of the composite sample from the very first or last part of the batch discharge Note 3. NOTE 2—Sampling should normally wstm 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. Smaller samples are not prohibited for routine air content, temperature, and slump tests.
Axtm Volume Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade. Obtain these portions within the time limit specified in Section asym.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The values stated in each system may not atm exact equivalents; therefore, each system shall be used independently of the other. 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.
No further reproductions authorized.