ASTM C786-96
(Test Method)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
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
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-[mu]m (No. 50), the 150-[mu]m (No. 100), and the 75-[mu]m (No. 200) sieves.
1.2 The values stated in SI units are to be regarded as the standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: C 786 – 96
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 C 786; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
76 mm 102 mm
(3-in.) (4-in.)
1.1 This test method covers wet sieving techniques for
mm (in.) mm (in.)
determination of fineness of hydraulic cement and raw mate-
Diameter of frame 76 6 6 102 6 6
rials by means of the 300-μm (No. 50), the 150-μm (No. 100),
(3.0 6 0.25) (4.0 6 0.25)
and the 75-μm (No. 200) sieves.
1.2 The values stated in SI units are to be regarded as the Depth of sieve from top of frame 83 6 6 108 6 6
(3.25 6 0.25) (4.25 6 0.25)
standard.
1.3 This standard does not purport to address all of the
Overall height 102 6 6 127 6 6
safety concerns, if any, associated with its use. It is the (4.0 6 0.25) (5.0 6 0.25)
responsibility of the user of this standard to establish appro-
3.1.1 For a sieve fabricated by soldering the cloth to the
priate safety and health practices and determine the applica-
frame, the joint shall be made smooth to prevent material from
bility of regulatory limitations prior to use.
lodging in the joints between the sieve cloth and the frame.
Two-piece sieves shall clamp tightly on the cloth to prevent
2. Referenced Documents
particles from lodging in the joints between the sieve cloth and
2.1 ASTM Standards:
the frame, and shall have legs of sufficient length, 19-mm
C 114 Test Methods for Chemical Analysis of Hydraulic
(0.75-in.) minimum, to allow air circulation beneath the sieve
Cement
cloth.
C 184 Test Method for Fineness of Hydraulic Cement by
3.2 Spray Nozzle, conforming to the requirements of Test
the 150-μm (No. 100) and 75-μm (No. 200) Sieves
Method C 430. Nozzles having an alternative design are
C 430 Test Method for Fineness of Hydraulic Cement by
acceptable if the sieve test results agree with those performed
the 45-μm (No. 325) Sieve
using a nozzle conforming to Test Method C 430.
E 11 Specification for Wire-Cloth Sieves for Testing Pur-
3.3 Pressure Gage, conforming to the requirements of Test
poses
Method C 430.
3.4 Balance, analytical, accurate to within 0.005 g.
3. Apparatus
3.5 Weights—The weights used in fineness determinations
3.1 Wet Test Sieves—Standard 300-μm (No. 50), 150-μm
shall conform to the requirements of Test Methods C 114.
(No. 100), or 75-μm (No. 200) sieve cloth conforming to the
3.6 Brush—A nylon or pure bristle brush will be required
requirements of Specification E 11, for standard sieves shall be
for use in cleaning the sieves. A13-mm (0.5-in.) diameter
woven from AISI Type 304 wire. The cloth shall be mounted in
round-style brush with a 229-mm (9-in.) handle is a convenient
the frame without distortion, looseness, or wrinkling. Sieve
size.
frames are designated as 3 or 4-in. (76.2 or 101.6-mm)
NOTE 1—Caution: Do not use brass or steel-bristle brushes for clean-
diameter type, as follows:
ing sieves due to the possibility that the stiff bristle will part the wire
Sieves
weave, thereby altering the size of the openings and rendering the sieve
useless. A13-mm ( ⁄2-in.) hog bristle stencil brush is also satisfactory for
brushing sieves.
3.7 Dry Test Sieves—The standard samples for calibrating
This test method is under the jurisdiction of ASTM Committee C-1 on Cement
and is the direct responsibility of Subcommittee C01.25 on Fineness.
the wet test sieves must be standardized on 203-mm (8-in.)
Current edition approved May 10, 1996. Published July 1996. Originally
diameter sieves meeting the requirements of Test Method
published as C 786 – 74. Last previous edition C 786 – 94.
2 C 184. The 300-μm (No. 50) sieve shall meet the same
Annual Book of ASTM Standards, Vol 04.01.
Annual Book of ASTM Standards, Vol 14.02. requirements.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C786–96
~5.40 3 25.5/100! 2 1.25
3.8 NBS SRM No. 1004—Glass Bead Standard.
Correction factor, C, % 5 (2)
1.25
4. Dry Sieve Standardization
3 1005610.2
4.1 Correction Factors:
NOTE 2—The sieve correction is specified as a factor to be multiplied
4.1.1 Correction of the residues obtained on the 203-mm
by the residue obtained, and therefore the amount to be added to or
(8-in.) diameter 300-μm (No. 50) and 150-μm (No. 100) dry subtracted from the test residue in any given instance is proportional to the
amount of the residue.
testing sieves is not required.
4.1.2 Where applicable, a correction factor for a 75-μm (No.
6. Procedure for Wet Sieving
200) sieve shall be determined using the instructions given in
Annex A1. A correction factor should be determined when
6.1 Weigh the sample to the nearest 0.01 g using approxi-
accuracy is desired in order to compare results between
mately 50 g for a 300-μm (No. 50), 25 g for a 150-μm (No.
laboratories.
100), or 10 g for a 75-μm (No. 200) determination. Record the
4.2 Standard Samples—Each laboratory must prepare its
weight and transfer the sample quantitatively to a clean dry
own standard samples for wet-sieve tests for each of the sieve
sieve. Wet the sample thoroughly with a gentle stream of water.
sizes used. Select standard samples at a level of fineness in the
Remove the sieve from under the nozzle and adjust the
same range as that used in routine work. After the selected
pressure on the spray nozzle to 69 6 4 kPa (10 6 0.5 psi).
material is reserved, uniformly mix the gross sample by
Return the sieve to its position under the nozzle and wash for
placing it on a sheet of rubber, oil cloth, or heavy wrapping
1 ⁄2 min, moving the sieve in the spray with a circular motion
paper, depending on the sample size, and raising first one
in a horizontal plane at the rate of one motion per second.
corner of the sheet and then the other so as to roll the sample
Every portion of the screen should be sprayed during each
over and over at least 100 times. Temporarily seal the prepared
circular motion of the sieve. Hold the sieve so that the bottom
standard material in airtight containers during the standardiza-
of the spray nozzle extends 13 mm (0.5 in.) below the top of
tion procedure prior to sealing small portions as standard
the sieve frame. Immediately after removing the sieve from the
samples in vials. Using the 203-mm (8-in.) diameter sieves
spray, rinse once with about 50 cm of distilled or deionized
from 3.7, perform the dry sieving tests, following the proce-
water using caution not to lose any of the residue. Gently blot
dure of Test Method C 184. Repeat the test three times and use
the lower surface of the screen cloth with a damp, clean cloth.
the average of the amounts passing, expressed as percent, as
Dry the sieve and residue in an oven or over a hot plate (see
the standard v
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