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.
|Published (Last):||9 April 2010|
|PDF File Size:||7.96 Mb|
|ePub File Size:||1.78 Mb|
|Price:||Free* [*Free Regsitration Required]|
ASTM C | Testing Services | Standard Practice for Sampling Freshly Mixed Concrete
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. Start molding specimens for strength tests within 15 min after fabricating the composite sample. Due to the difficulty of determining the actual quantity of concrete discharged, the asfm is to provide samples that are representative of widely separated portions, but not the axtm and the end of the load.
The detailed requirements as to materials, mixtures, air content, temperature, number f172 specimens, slump, interpretation of results, and precision and bias are in specific test methods. 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.
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.
Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: 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.
Smaller samples are not prohibited for routine air content, temperature, and slump astk. No further reproductions authorized. Satm hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.
The size of the samples shall be dictated by the maximum aggregate size. This standard is subject to revision c127 any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
Active Risk Management
Shake or vibrate the sieve by hand or mechanical means until no undersize material remains on the sieve. NOTE 6—The effect of wet-sieving on the test results should be considered. Perform sampling by passing a receptacle completely through the discharge stream, or by completely diverting the discharge into a sample container.
The air content 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. For example, wet-sieving concrete causes the loss of a small amount asstm air due to additional handling. Obtain samples from at least five different portions of the pile and combine them into one composite sample for test purposes.
Combine into one composite sample for testing purposes. These requirements apply to both tilting and nontilting mixers. Procedures c712 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.
Originally approved in Last previous edition approved in as C— X172 values stated in each system may not be exact equivalents; therefore, each asfm shall be used independently of the other.
Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample axtm.
Mortar adhering aztm the aggregate retained on the sieve shall not be wiped from it before it is discarded. After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5.
Martins, Damasceno, Awada – Pronto-socorro Pronto-socorro: The effect of these differences may need to be considered or determined by supplementary testing for quality control or test result evaluation purposes. Do not obtain portions of the composite sample from the very first or last part of the batch discharge Note 3. This removal of larger aggregate particles is preferably accomplished by wet-sieving.
Sample the concrete at the frequency specified by collecting two or more portions taken at regularly spaced intervals during discharge of the concrete. C1172 the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch.
ASTM Aztm takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Expeditiously obtain and use the sample and protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination.
Combining values from the two systems may result in non-conformance with the aatm. Work Item s – proposed revisions of this standard.
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. 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.
Parte 1 de 2 Designation: The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 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. 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.
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. Historical Version s – view previous versions of standard.