1、Designation: C430 08 (Reapproved 2015)Standard Test Method forFineness of Hydraulic Cement by the 45-m (No. 325) Sieve1This standard is issued under the fixed designation C430; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the determination of the fine-ness of hydraulic cement by means of the 45-m (No. 325)si
3、eve.1.2 The values stated in SI units are to be regarded as thestandard. The inch-pound equivalents of SI units may beapproximate.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establis
4、h appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE161 Specification for Precision Electroformed SievesE177 Practice for Use of
5、the Terms Precision and Bias inASTM Test Methods3. Apparatus3.1 Sieve:3.1.1 Sieve FrameThe sieve frame shall be of metal notsubject to corrosion by water and shall be circular, either 51 66 mm (2.0 6 0.25 in.) when woven-wire cloth is mounted inthe frame or 76 6 6 mm (3.0 6 0.25 in.) in diameter whe
6、n anelectroformed sheet is mounted in the frame. The depth of thesieve from the top of the frame to the cloth or sheet shall be 766 6 mm (3.0 6 0.25 in.). The frame shall have either side wallsof 89 6 6 mm (3.5 6 0.25 in.) in total height, or legs at least12 mm (0.5 in.) in length, sufficient to all
7、ow air circulationbeneath the sieve cloth or electroformed sheet.3.1.2 Sieve Cloth or Electroformed SheetThe sieve frameshall be fitted with either a 45-m (No. 325) stainless steelAISIType 304 woven-wire sieve cloth, conforming to the require-ments of Specification E11 or a 45-m electroformed rein-f
8、orced nickel sieve sheet conforming to the requirements ofSpecification E161 with the exception that the number ofopenings shall be 71 6 2 per linear centimetre (180 6 5 perlinear inch).3.1.3 Cloth or Sheet Mounting:3.1.3.1 Woven-Wire Cloth MountingType 304 stainlesssteel woven-type cloth shall be m
9、ounted in the frame withoutdistortion, looseness, or wrinkling. For a sieve fabricated bysoldering the cloth to the frame, the joint shall be made smoothto prevent the cement from catching in the joints between thesieve cloth and the frame. Two-piece sieves shall clamp tightlyon the cloth to prevent
10、 the cement from catching in the jointsbetween the sieve cloth and the frame.3.1.3.2 Electroformed Sieve Sheet MountingElectroformed reinforced nickel sieve sheet shall be mountedin the frame without distortion, looseness, or wrinkling. Thejoint between the sieve cloth and the frame shall be madesmo
11、oth with a material impervious to water.3.2 Spray NozzleThe spray nozzle (Fig. 1) shall be con-structed of metal not subject to corrosion by water and shall be17.5 mm (0.69 in.) in inside diameter with a central hole drilledin line with the longitudinal axis, an intermediate row of eightholes drille
12、d 6 mm (0.23 in.) center-to-center at an angle of 5from the longitudinal axis, and an outer row of eight holesdrilled 11 mm (0.44 in.) center-to-center at an angle of 10from the longitudinal axis. All holes shall be 0.5 mm (0.02 in.)in diameter. The spray nozzle shall have been checked withinsix mon
13、ths prior to testing a cement sample to ensure that theflow rate is between 1500 and 3000 g/min at 69 6 3 kPa (106 0.4 psi).3.3 Pressure GageThe pressure gage shall be 76 mm (3.0in.) minimum diameter, and shall be graduated in 7-kPa (1-psi)increments, and shall have a maximum capacity of 207 kPa (30
14、psi). The accuracy at 69 kPa (10 psi) shall be 62 kPa (60.25psi).4. Calibration of 45-m (No. 325) Sieve4.1 Place 1.000 g of the current lot of National Institute ofStandards and Technology standard sample No. 114 or No. 46h1This test method is under the jurisdiction of ASTM Committee C01 on Cementan
15、d is the direct responsibility of Subcommittee C01.25 on Fineness.Current edition approved Oct. 1, 2015. Published October 2015. Originallyapproved in 1959. Last previous edition approved in 2008 as C430 08. DOI:10.1520/C0430-08R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org
16、, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700
17、, West Conshohocken, PA 19428-2959. United States1on the clean, dry, 45-m (No. 325) sieve and proceed as inSection 5. The sieve correction factor is the difference betweenthe test residue obtained and the assigned residue valueindicated by the electroformed sheet sieve fineness specifiedfor the stan
18、dard sample, expressed as a percentage of the testresidue.NOTE 1It should be observed that the sieve correction as specified isa factor to be multiplied by the residue obtained and that the amount to beadded to or subtracted from the residue in any given test is thereforeproportional to the amount o
19、f residue.Example of Determination of Sieve Correction Factor:Residue on 45-m (No. 325) Sieve, sample No. 114or No. 46h12.2 %Residue for a 1-g sample 0.122 gResidue on sieve being calibrated 0.093 gDifference = + 0.029 gCorrection factor = + 0.029 0.093 100 = + 31.18 = + 31.2 %5. Procedure5.1 Place
20、a 1.000 g sample of the cement on the clean, dry45-m (No. 325) sieve. Wet the sample thoroughly with agentle stream of water. Remove the sieve from under thenozzle and adjust the pressure on the spray nozzle to 69 6 4kPa (10 6 0.5 psi). Return the sieve to its position under thenozzle and wash for 1
21、 min, moving the sieve with a circularmotion in a horizontal plane at the rate of one motion persecond in the spray. The bottom of the spray nozzle shouldextend below the top of the sieve frame about 12 mm (0.5 in.).Immediately upon removing the sieve from the spray, rinseonce with about 50 cm3of di
22、stilled or deionized water, usingcaution not to lose any of the residue, and then blot the lowersurface gently upon a damp cloth. Dry the sieve and residue inan oven or over a hot plate (see Note 2), supporting the sievein such a manner that air may pass freely beneath it. Cool thesieve; then brush
23、the residue from the sieve and weigh on ananalytical balance capable of reproducing results within 0.0005g.NOTE 2Care should be taken not to heat the sieve hot enough to softenthe solder.6. Cleaning of 45-m (No. 325) Sieves6.1 Frequency of Cleaning and CalibrationSieves fittedwith woven wire sieve c
24、loth shall be cleaned after no more thanfive determinations. Sieves fitted with an electroformed rein-forced sieve sheet having 71 openings per linear centimetreshall be cleaned after no more than three determinations. Bothtypes of sieves shall be recalibrated after no more than 100determinations.6.
25、2 Acceptable Cleaning ProceduresOne option for clean-ing is to place the sieve in a low-power (150 W maximumpower input) ultrasonic bath containing an appropriate labora-tory cleaning solution. The bath is to be operated for sufficienttime (approximately 10 to 15 min at room temperature) toremove pa
26、rticles lodged in the openings. Be apprised thatelectroformed sieve sheets containing more than 71 openingsper linear centimetre may well be damaged by ultrasoniccleaning. An option for cleaning which does not require anultrasonic bath can also be employed. Immerse the sieve in abath of appropriate
27、laboratory cleaning solution heated to justbelow boiling point. Cover with a watch glass to reduceevaporation. Continue this soaking for a time sufficient toloosen lodged particles with a rinse following the bath.Overnight soaking in similar but unheated cleaning solutions isalso acceptable, provide
28、d a rinse following the bath is able towash away lodged particles. Cleaning or rinsing with dilutehydrochloric or acetic acid solutions is to be avoided. Appro-priate cleaning solutions are restricted to soap or detergent-typesolutions.7. Calculation7.1 Calculate the fineness of the cement to the ne
29、arest 0.1 %as follows:Rc5 Rs3 1001C! (1)F 5 100 2 Rc(2)where:F = fineness of the cement expressed as the correctedpercentage passing the 45-m (No. 325) sieve,Rc= corrected residue, %,Rs= residue from the sample retained on the 45-m (No.325) sieve, g, andC = sieve correction factor (determined as pre
30、scribed inSection 4) which may be either plus or minus.Example:Sieve correction factor, C = +31.2 %Residue from sample being tested, Rs= 0.088 gCorrected residue, Rc=0.088 (100 + 31.2)11.5 %Corrected amount passing, F = 10011.5%=88.5%8. Precision and Bias8.1 Normal Fineness ProductThe multilaborator
31、y preci-sion has been found to be 60.75 % (IS) as defined in PracticeE177, therefore, results of properly conducted tests from twodifferent laboratories on identical samples of cement shouldagree 95 % of the time within 62.1 %.FIG. 1 Spray Nozzle with Seventeen 0.02-in. (0.51-mm) HolesC430 08 (2015)
32、28.2 High Fineness ProductThe multilaboratory precisionhas been found to be 60.50 % (IS) as defined in Practice E177;therefore, results of properly conducted tests from two differentlaboratories on identical samples of cement should agree 95 %of the time within 61.4 %.NOTE 3The use of outside thread
33、s instead of inside threads as shownin this figure is permissible.8.3 Since there is no accepted reference material suitable fordetermining the bias for the procedure in this test method, nostatement on bias is being made.9. Keywords9.1 fineness of hydraulic cementSUMMARY OF CHANGESCommittee C01 has
34、 identified the location of selected changes to this test method since the last issue,C430 96(2003), that may impact the use of this test method. (Approved December 1, 2008)(1) Revised 4.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with a
35、ny item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technica
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37、at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor
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