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The practice includes sampling from stationary, paving and truck mixers, and from agitating and nonagitating equipment used to transport central-mixed concrete. The values shown in parentheses are provided for information only. NOTE 1Composite samples are required by this practice, unless specically excepted by procedures governing the tests to be performed such as tests to determine uniformity of consistency and mixer efficiency. Procedures used to select the specic test batches are not described in this practice, but it is recommended that random sampling be used to determine overall specication compliance.
Referenced Documents 2. Signicance and Use 3. The detailed requirements as to materials, mixtures, air content, temperature, number of specimens, slump, interpretation of results, and precision and bias are in specic test methods. Sampling 4. They shall be combined and remixed with a shovel the minimum amount necessary to ensure uniformity and compliance with the maximum time limits specied in 4.
Complete these tests expeditiously. Start molding specimens for strength tests within 15 min after fabricating the composite sample. 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. 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. WarningFresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.
Current edition approved June 1, Published June Originally approved in Last previous edition approved in as C C 04 5. Procedure 5. Smaller samples are not prohibited for routine air content, temperature, and slump tests.
The size of the samples shall be dictated by the maximum aggregate size. Sample by repeatedly passing a receptacle through the entire discharge stream or by completely diverting the discharge into a sample container. 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. NOTE 5The effect of wet-sieving on the test results should be considered.
For example, wet-sieving concrete causes the loss of a small amount of air due to additional handling. 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. 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 effect of these differences may need to be considered or determined by supplementary testing for quality control or test result evaluation purposes. Obtain these portions within the time limit specied in Section 4. Composite the portions into one sample for testing purposes. Do not obtain portions of the composite sample from the very rst or last part of the batch discharge Note 3.
Perform sampling by passing a receptacle completely through the discharge stream, or by completely diverting the discharge into a sample container. 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.
Take care not to restrict the ow of concrete from the mixer, container, or transportation unit so as to cause segregation. These requirements apply to both tilting and nontilting mixers. 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. Obtain samples from at least ve different portions of the pile and then composite into one sample for test purposes.
Avoid contamination with subgrade material or prolonged contact with and absorptive subgrade. 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. Composite the samples so obtained into one sample for test purposes.
The containers shall be of a size sufficient to provide a composite sample size that is in agreement with the maximum aggregate size. NOTE 4In some instances, the containers may have to be supported above the subgrade to prevent displacement during discharge.
Take the samples so obtained within the time limit specied in Section 4 and composite them into one sample for test purposes. In any case do not obtain.
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