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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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.
Last previous edition approved in as C— Procedures used to select the specific test batches are c1172 described in this practice, but it is recommended that random sampling be used to determine overall specification compliance. Combine the samples so obtained into one composite sample for test purposes.
Mixers—Sample the concrete by collecting two or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch. NOTE 6—The effect of wet-sieving on the test results should be considered.
This shall be done before remixing. C72 – 16 – Compressive Strength of Cylindrical 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Current edition approved Oct. Combine into one composite sample for testing purposes. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
After obtaining the composite sample, wait a minimum of 2 minutes and a maximum of 5 minutes before beginning tests Note 5. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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.
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The apparent strength of wet-sieved concrete in smaller specimens is usually greater than that of the total concrete in larger appropriate size specimens. The equipment shall be capable of rapidly and effectively removing the designated size of aggregate. NOTE 4—In some instances, the containers may have to be supported above the subgrade to prevent displacement during discharge.
NOTE 5—The waiting period prior to c127 the testing is needed because the mix water is input only seconds before discharge from the continuous mixer.
Mortar adhering to the aggregate retained on the sieve c1772 not be wiped from it before it is discarded. 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 size of the samples shall be dictated by the maximum aggregate size.
Obtain samples from at least five different portions of the pile and combine them into one composite sample for test purposes. Generally, a horizontal back and forth motion is preferred. Sample the concrete at the frequency specified by collecting two or more portions taken at regularly spaced intervals during discharge of the concrete.
For example, wet-sieving concrete causes the loss of a small amount of air due to additional asgm. Approved October 1, ASTM Volume 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. Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container.
ASTM C Standard
Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. Perform sampling by passing c17 receptacle completely through the discharge stream, or by completely diverting the discharge into a sample container. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Historical Version s – view previous versions of 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 asmt address shown below.
ASTM C172 – Sampling Fresh Concrete
Expeditiously obtain and use the sample and protect the sample from the sun, wind, and other sources of rapid evaporation, and from contamination. This removal of larger aggregate particles is preferably accomplished by wet-sieving. The effect of these differences may need to be considered or determined by supplementary testing for quality control or test result evaluation purposes.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Do not obtain portions of the composite sample from the very first or last part of the aztm discharge Note 3. If discharge of the concrete is too rapid to divert the complete discharge stream, discharge the concrete into a container or c1172 unit sufficiently large to accommodate the entire batch and then accomplish the sampling in the same manner as given above. Parte 1 de 2 Designation: 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.
This removal of larger aggregate particles is preferably accomplished by wet-sieving. Place only enough cc172 on the sieve at any one time so that after sieving, the thickness of the layer of retained aggregate is not more than one particle thick.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability adtm regulatory limitations prior to use.
CM – 12 – Microscopical Determination of Complete these tests expeditiously.
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 2—Sampling should normally be performed as the concrete is delivered ast 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.