ASTM C136/C136M-19 pdf free download.Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates.
1.1 This test method covers the determination of the particle size distribution of tine and coarse aggregates by sieving.
1.2 Some specifications for aggregates which reference this test method contain grading requirements including both coarse and tine fractions. Instructions are included for sieve analysis of such aggregates.
1 .3 Units—The values stated in either SI units or inchpound units are to be regarded separately as standard. The values stated in each system may not he exact equivalents; therefore, each system shall he used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
6. Apparatus
6.1 Balances—Balances or scales used in testing fine and coarse aggregate shall have readability and accuracy as follows:
6.1.1 For fine aggregate. readable to 0.1 g and accurate to
0.1 g or 0.1 % of the test load, whichever is greater, at any point within the range of use.
6.1.2 For coarse aggregate, or mixtures of fine and coarse aggregate, readable and accurate to 0.5 g or 0.1 % of the test load, whichever is greater, at any point within the range of usc.
6.2 Sieves—The sieve cloth shall be mounted on substantial frames constructed in a manner that will prevent loss of material during sieving. The sieve cloth and standard sieve frames shall conform to the requirements of Specification El I. Nonstandard sieve frames shall conform to the requirements of Specification El I as applicable.
NorE 2—It is recommended that sieves mounted in frames larger than standard 203.2-mm [8 in.l diameter he used for testing coarse aggregate to reduce the possibility of overloading the sieves. See 8.3.
6.3 Mechanical Sieve Shaker—A mechanical sieving device, if used, shall create motion of the sieves to cause the particles to bounce, tumble, or otherwise turn so as to present different orientations to the sieving surface. The sieving action shall be such that the criterion for adequacy of sieving described in X.4 is met in a reasonable time period.
NOTE 3—Use of a mechanical sieve shaker is recommended when the size of the sample is 20 kg or greater, and may be used for smaller samples. including fine aggregate. Excessive time to achieve adequate sieving may result in degradation of the sample. The same mechanical sieve shaker may not be practical for all sizes of samples. since the large sieving area needed for practical sieving of a large nominal size coarse aggregate very likely could result in loss of a portion of the sample if used for a small sample of coarse aggregate or fine aggregate.
6.4 Oven—An oven of appropriate size capable of maintaining a uniform temperature of 110 ± 5 °C [230 ± 10 °F].
7. Sampling
7.1 Sample the aggregate in accordance with Practice D75.
The size of the field sample shall he the quantity shown in Practice D75 or four times the quantity required in 7.4 and 7.5(except as modified in 7.6), whichever is greater.
7.2 Thoroughly mix the sample and reduce it to an amount suitable for testing using the applicable procedures described in Practice C702. The sample for test shall be approximately the quantity desired when dry and shall be the end result of the reduction. Reduction to an exact predetennined quantity shall not be permitted.ASTM C136/C136M pdf download.