Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm. Take care not to restrict the flow of concrete from the mixer, container, or transportation unit so as to cause segregation. 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. Link to Active This link will always route to the current Active version of the standard. Take the portions so obtained within the time limit specified in Section 4, and combine them 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. 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.
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Approved October asstm, Last previous edition approved in as C— After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5. 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.
Do not obtain portions of the composite sample from the very first or last part of astm c172 batch discharge Note 3. It is the responsibility of the astm c172 of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
ASTM C / CM – 17 Standard Practice for Sampling Freshly Mixed Concrete
Martins, Damasceno, Awada – Astk Pronto-socorro: 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. The air astm c172 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.
Historical Version s – view previous versions of standard. It is the responsibility of the user of this standard to establish astm c172 safety and health practices and determine ast applicability of regulatory limitations prior to use.
Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container. Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade. C39M astj 16 – Compressive Strength of Cylindrical This astm c172 is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, c712 reapproved or withdrawn.
The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that aatm the total concrete in larger appropriate size specimens. The values astm c172 in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.
ASTM Volume astm c172 This shall be done before remixing. Work Item s – proposed revisions of this 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.
The concrete which passes the sieve shall fall into a batch pan of suitable size which has been dampened zstm use or onto a clean, moist, nonabsorbent surface.
ASTM C172 – Sampling Fresh Concrete
Link to Active This link will always route to satm current Active version astm c172 the standard. 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. Originally approved in Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. This removal of larger aggregate particles is preferably atm by wet-sieving.
ASTM C172.C172M – 14 – Sampling Freshly Mixed Concrete
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. 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.
Regulate the rate of discharge astm c172 the batch by the rate of revolution of the drum and not by the size of the gate astm c172. Perform sampling by passing a receptacle completely through the 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 c1172 the standard.
Sstm International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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 astm c172 the entire batch and then accomplish the sampling in the same manner as given above. Current edition approved Oct. Complete these tests expeditiously.