28 Jan ASTM C Sampling Freshly Mixed Concrete. P. F. N/A. Procedure. 1. Obtain a representative sample source (i.e. revolving drum truck mixer). Referenced Documents ASTM Standards: 3 E 11 Speciﬁcation for Wire-Cloth and Sieves for Testing Purposes 3. Signiﬁcance and Use This practice is. Performance Examination Checklist — ASTM C Sampling (PERFORMANCE) . ACI Concrete Field Testing Technician—Grade I. Page 1 of 1. Examinee.
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Combine the samples so obtained into one composite sample for test purposes.
Smaller samples are not prohibited for routine air content, temperature, and slump tests. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
The equipment shall be capable of rapidly and effectively removing the designated size of aggregate. No further reproductions authorized. 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.
ASTM C / CM – 17 Standard Practice for Sampling Freshly Mixed Concrete
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This removal of larger aggregate particles is preferably accomplished by wet-sieving. 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.
ASTM Volume Last previous edition approved in as C— A superscript epsilon indicates an editorial change since the last revision or reapproval.
Combine into one composite sample for testing purposes. If discharge of the concrete is too rapid astn 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.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The values stated 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. Link to Active This link will always route to the current Active version of the standard.
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: Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Generally, a horizontal back and forth motion is preferred. 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.
Mortar adhering to the aggregate retained on the sieve shall not be wiped from c1172 before it xstm discarded. Perform sampling by passing a receptacle completely through the discharge stream, or by completely diverting the discharge into a sample container. Take the samples so obtained within the time limit specified in Section 4 and combine them into one composite sample for test purposes.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. This shall be done before remixing. They shall be combined and remixed with a shovel the minimum amount necessary v172 ensure uniformity and compliance with the maximum time limits specified in 4.
NOTE 4—In some instances, the containers may have to be supported above the subgrade to prevent displacement during discharge. Asmt example, wet-sieving concrete causes the loss of a small amount of air due to additional handling.
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. 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.
ASTM C172.C172M – 14 – Sampling Freshly Mixed Concrete
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. Shake or c12 the sieve by hand or mechanical means until no undersize material remains on the sieve.
Start molding specimens for strength tests within 15 min after fabricating the composite sample.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 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.
Agitators—Sample the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch.
ASTM CCM – 14 – Sampling Freshly Mixed Concrete –
sstm Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 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. 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.