ASTM C786/C786M-17

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Designation: C786/C786M − 10 (Reapproved 2016) C786/C786M − 17
Standard Test Method for
Fineness of Hydraulic Cement and Raw Materials by the
300-μm (No. 50), 150-μm (No. 100), and 75-μm (No. 200)
Sieves by Wet Methods
This standard is issued under the fixed designation C786/C786M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers wet sieving techniques for determination of fineness of hydraulic cement and raw materials by
means of the 300-μm (No. 50), the 150-μm (No. 100), and the 75-μm (No. 200) sieves.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard. Values in SI units [or inch-pound units] shall be obtained by
measurement in SI units [or inch-pound units] or by appropriate conversion, using the Rules for Conversion and Rounding given
in IEEE/ASTM SI 10 of measurements made in other units. Values are stated in SI units when inch-pound units are not used in
practice.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C114 Test Methods for Chemical Analysis of Hydraulic Cement
C125 Terminology Relating to Concrete and Concrete Aggregates
C184 Test Method for Fineness of Hydraulic Cement by the 150-μm (No. 100) and 75-μm (No. 200) Sieves (Withdrawn 2002)
C219 Terminology Relating to Hydraulic Cement
C430 Test Method for Fineness of Hydraulic Cement by the 45-μm (No. 325) Sieve
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
IEEE/ASTM SI 10 American National Standard for Use of the International System of Units (SI): The Modern Metric System
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C125 and C219.
4. Apparatus
4.1 Wet Test Sieves—Standard 300-μm (No. 50), 150-μm (No. 100), or 75-μm (No. 200) sieve cloth conforming to the
requirements of Specification E11, for standard sieves shall be woven from AISI Type 304 wire. The cloth shall be mounted in
the frame without distortion, looseness, or wrinkling. Sieve frames are designated as 76.2 or 101.6-mm [3 or 4-in.] diameter type,
as follows:
This test method is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.25 on Fineness.
Current edition approved April 1, 2016Dec. 1, 2017. Published April 2016December 2017. Originally approved in 1974. Last previous edition approved in 20102016 as
C786/C786M – 10.C786/C786M – 10 (2016). DOI: 10.1520/C0786_C0786M-10R16.10.1520/C0786_C0786M-17.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
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C786/C786M − 17
Sieves
76 mm 102 mm
[3-in.] [4-in.]
mm [in.] mm [in.]
Diameter of frame 76 ± 6 102 ± 6
[3.0 ± 0.25] [4.0 ± 0.25]
Depth of sieve from top of frame 83 ± 6 108 ± 6
[3.25 ± 0.25] [4.25 ± 0.25]
Overall height 102 ± 6 127 ± 6
[4.0 ± 0.25] [5.0 ± 0.25]
4.1.1 For a sieve fabricated by soldering the cloth to the frame, the joint shall be made smooth to prevent material from lodging
in the joints between the sieve cloth and the frame. Two-piece sieves shall clamp tightly on the cloth to prevent particles from
lodging in the joints between the sieve cloth and the frame, and shall have legs of sufficient length, 19-mm [0.75-in.] minimum,
to allow air circulation beneath the sieve cloth.
4.2 Spray Nozzle—conforming to the requirements of Test Method C430. Nozzles having an alternative design are acceptable
if the sieve test results agree with those performed using a nozzle conforming to Test Method C430.
4.3 Pressure Gage—conforming to the requirements of Test Method C430.
4.4 Balance—analytical, accurate to within 0.005 g.
4.5 Weights—The weights used in fineness determinations shall conform to the requirements of Test Methods C114.
4.6 Brush—A nylon or pure bristle brush will be required for use in cleaning the sieves. A 13-mm [0.5-in.] diameter round-style
brush with a 229-mm [9-in.] handle is a convenient size. (Warning—Do not use brass or steel-bristle brushes for cleaning sieves
due to the possibility that the stiff bristle will part the wire weave, thereby altering the size of the openings and rendering the sieve
useless. A 13-mm [ ⁄2-in.] hog bristle stencil brush is also satisfactory for brushing sieves.)
4.7 Dry Test Sieves—The standard samples for calibrating the wet test sieves must be standardized on 203-mm [8-in.] diameter
sieves meeting the requirements of Test Method C184. The 300-μm (No. 50) sieve shall meet the same requirements.
4.8 NBS SRM No. 1004—Glass Bead Standard.
5. Dry Sieve Standardization
5.1 Correction Factors:
5.1.1 Correction of the residues obtained on the 203-mm [8-in.] diameter 300-μm (No. 50) and 150-μm (No. 100) dry testing
sieves is not required.
5.1.2 Where applicable, a correction factor for a 75-μm (No. 200) sieve shall be determined using the instructions given in
Annex A1. A correction factor should be determined when accuracy is desired in order to compare results between laboratories.
5.2 Standard Samples—Each laboratory must prepare its own standard samples for wet-sieve tests for each of the sieve sizes
used. Select standard samples at a level of fineness in the same range as that used in routine work. After the selected material is
reserved, uniformly mix the gross sample by placing it on a sheet of rubber, oil cloth, or heavy wrapping paper, depending on the
sample size, and raising first one corner of the sheet and then the other so as to roll the sample over and over at least 100 times.
Temporarily seal the prepared standard material in airtight containers during the standardization procedure prior to sealing small
portions as standard samples in vials. Using the 203-mm [8-in.] diameter sieves from 3.74.7, perform the dry sieving tests,
following the procedure of Test Method C184. Repeat the test three times and use the average of the amounts passing, expressed
as percent, as the standard value of the sample. Use this standard sample to calibrate the wet sieves. Place the entire sample in
airtight vials as soon as possible to prevent changes due to humidity. Vials shall be prepared in denominations such as to contain
approximately 50 g for standardizing the 300-μm (No. 50); 25 g for the 150-μm (No. 100); or 10 g for the 75-μm (No. 200) sieve.
6. Wet Sieve Calibration
6.1 Weigh the contents of the applicable size standard sample vial for the desired sieve determination on a balance of
appropriate sensitivity to the nearest 0.01 g. Record the weight and transfer the sample quantitatively to a clean dry wet test 300-μm
(No. 50), 150-μm (No. 100), or 75-μm (No. 200) sieve and proceed as directed in Section 67. The sieve correction factor is the
difference between the test residue obtained and the residue value indicated by the standardization tests of Secti
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