1、Designation: C430 08 (Reapproved 2015)C430 17Standard 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,
2、 the year 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 fineness of hydraulic cement by means of the 45-m (No.
3、325) sieve.1.2 The values stated in SI units are to be regarded as the standard. The inch-pound equivalents of SI units may be approximate.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard t
4、o establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision
5、on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Concrete AggregatesC219 Terminology Relating
6、 to Hydraulic CementE11 Specification for Woven Wire Test Sieve Cloth and Test SievesE161 Specification for Precision Electroformed SievesE177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods3. Terminology3.1 Definitions:3.2 For definitions of terms used in this test method, ref
7、er to Terminology C125 and C219.4. Apparatus4.1 Sieve:4.1.1 Sieve FrameThe sieve frame shall be of metal not subject to corrosion by water and shall be circular, either 51 6 6 mm(2.0 6 0.25 in.) 0.25 in.) when woven-wire cloth is mounted in the frame or 76 6 6 mm (3.0 6 0.25 in.) in diameter when an
8、electroformed sheet is mounted in the frame. The depth of the sieve from the top of the frame to the cloth or sheet shall be 76 66 mm (3.0 6 0.25 in.). The frame shall have either side walls of 89 6 6 mm (3.5 6 0.25 in.) in total height, or legs at least 12mm (0.5 in.) in length, sufficient to allow
9、 air circulation beneath the sieve cloth or electroformed sheet.4.1.2 Sieve Cloth or Electroformed SheetThe sieve frame shall be fitted with either a 45-m (No. 325) stainless steel AISIType 304 woven-wire sieve cloth, conforming to the requirements of Specification E11 or a 45-m electroformed reinfo
10、rced nickelsieve sheet conforming to the requirements of Specification E161 with the exception that the number of openings shall be 71 62 per linear centimetre (180 6 5 per linear inch).4.1.3 Cloth or Sheet Mounting:4.1.3.1 Woven-Wire Cloth MountingType 304 stainless steel woven-type cloth shall be
11、mounted in the frame withoutdistortion, looseness, or wrinkling. For a sieve fabricated by soldering the cloth to the frame, the joint shall be made smooth toprevent the cement from catching in the joints between the sieve cloth and the frame. Two-piece sieves shall clamp tightly on thecloth to prev
12、ent the cement from catching in the joints between the sieve cloth and the frame.1 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 Oct. 1, 2015Dec. 1, 2017. Published October 2015D
13、ecember 2017. Originally approved in 1959. Last previous edition approved in 20082015as C430 08.C430 08 (2015). DOI: 10.1520/C0430-08R15.10.1520/C0430-17.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM S
14、tandardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possi
15、ble to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopy
16、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.3.2 Electroformed Sieve Sheet MountingElectroformed reinforced nickel sieve sheet shall be mounted in the framewithout distortion, looseness, or wrinkling. The joint between the sieve cl
17、oth and the frame shall be made smooth with a materialimpervious to water.4.2 Spray NozzleThe spray nozzle (Fig. 1) shall be constructed of metal not subject to corrosion by water and shall be 17.5mm (0.69 in.) in inside diameter with a central hole drilled in line with the longitudinal axis, an int
18、ermediate row of eight holesdrilled 6 mm (0.23 in.) center-to-center at an angle of 5 from the longitudinal axis, and an outer row of eight holes drilled 11 mm(0.44 in.) center-to-center at an angle of 10 from the longitudinal axis.All holes shall be 0.5 mm (0.02 in.) in diameter. The spraynozzle sh
19、all have been checked within six months prior to testing a cement sample to ensure that the flow rate is between 1500and 3000 g/min at 69 6 3 kPa (10 6 0.4 psi).0.4 psi).4.3 Pressure GageThe pressure gage shall be 76 mm (3.0 in.) (3.0 in.) minimum diameter, and shall be graduated in 7-kPa(1-psi) inc
20、rements, and shall have a maximum capacity of 207 kPa (30 psi). The accuracy at 69 kPa (10 psi) shall be 62 kPa(60.25 psi).(60.25 psi).5. Calibration of 45-m (No. 325) Sieve5.1 Place 1.000 g of the current lot of National Institute of Standards and Technology standard sample No. 114 or No. 46h onthe
21、 clean, dry, 45-m (No. 325) sieve and proceed as in Section 56. The sieve correction factor is the difference between the testresidue obtained and the assigned residue value indicated by the electroformed sheet sieve fineness specified for the standardsample, expressed as a percentage of the test re
22、sidue.NOTE 1It should be observed that the sieve correction as specified is a factor to be multiplied by the residue obtained and that the amount to be addedto or subtracted from the residue in any given test is therefore proportional to the amount of residue.Example of Determination of Sieve Correc
23、tion 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 %6. Procedure6.1 Place a 1.000 g sample of the cement on the clean, dry 4
24、5-m (No. 325) sieve. Wet the sample thoroughly with a gentlestream of water. Remove the sieve from under the nozzle and adjust the pressure on the spray nozzle to 69 6 4 kPa 4 kPa (10 60.5 psi). Return the sieve to its position under the nozzle and wash for 1 min, moving the sieve with a circular mo
25、tion in ahorizontal plane at the rate of one motion per second in the spray. The bottom of the spray nozzle should extend below the topof the sieve frame about 12 mm (0.5 in.). Immediately upon removing the sieve from the spray, rinse once with about 50 cm3 ofdistilled or deionized water, using caut
26、ion not to lose any of the residue, and then blot the lower surface gently upon a damp cloth.FIG. 1 Spray Nozzle with Seventeen 0.02-in. (0.51-mm) HolesC430 172Dry the sieve and residue in an oven or over a hot plate (see Note 2), supporting the sieve in such a manner that air may pass freelybeneath
27、 it. Cool the sieve; then brush the residue from the sieve and weigh on an analytical balance capable of reproducing resultswithin 0.0005 g.0.0005 g.NOTE 2Care should be taken not to heat the sieve hot enough to soften the solder.7. Cleaning of 45-m (No. 325) Sieves7.1 Frequency of Cleaning and Cali
28、brationSieves fitted with woven wire sieve cloth shall be cleaned after no more than fivedeterminations. Sieves fitted with an electroformed reinforced sieve sheet having 71 openings per linear centimetre shall be cleanedafter no more than three determinations. Both types of sieves shall be recalibr
29、ated after no more than 100 determinations.7.2 Acceptable Cleaning ProceduresOne option for cleaning is to place the sieve in a low-power (150 W maximum powerinput) ultrasonic bath containing an appropriate laboratory cleaning solution. The bath is to be operated for sufficient time(approximately 10
30、 to 15 min at room temperature) to remove particles lodged in the openings. Be apprised that electroformed sievesheets containing more than 71 openings per linear centimetre may well be damaged by ultrasonic cleaning.An option for cleaningwhich does not require an ultrasonic bath can also be employe
31、d. Immerse the sieve in a bath of appropriate laboratory cleaningsolution heated to just below boiling point. Cover with a watch glass to reduce evaporation. Continue this soaking for a timesufficient to loosen lodged particles with a rinse following the bath. Overnight soaking in similar but unheat
32、ed cleaning solutionsis also acceptable, provided a rinse following the bath is able to wash away lodged particles. Cleaning or rinsing with dilutehydrochloric or acetic acid solutions is to be avoided. Appropriate cleaning solutions are restricted to soap or detergent-typesolutions.8. Calculation8.
33、1 Calculate the fineness of the cement to the nearest 0.1 % as follows:Rc 5Rs 31001C! (1)F 51002Rc (2)where:F = fineness of the cement expressed as the corrected percentage passing the 45-m (No. 325) sieve,Rc = corrected residue, %,Rs = residue from the sample retained on the 45-m (No. 325) sieve, g
34、, andC = sieve correction factor (determined as prescribed in Section 4) which may be either plus or minus.C = sieve correction factor (determined as prescribed in Section 5) which may be either plus or minus.Example:Sieve correction factor, C = +31.2 %Residue from sample being tested, Rs = 0.088 gC
35、orrected residue, Rc =0.088 (100 + 31.2)11.5 %Corrected amount passing, F = 100 11.5 % = 88.5 %9. Precision and Bias9.1 Normal Fineness ProductThe multilaboratory precision has been found to be 60.75 % (IS) as defined in Practice E177,therefore, results of properly conducted tests from two different
36、 laboratories on identical samples of cement should agree 95 % ofthe time within 62.1 %.9.2 High Fineness ProductThe multilaboratory precision has been found to be 60.50 % (IS) as defined in Practice E177;therefore, results of properly conducted tests from two different laboratories on identical sam
37、ples of cement should agree 95 % ofthe time within 61.4 %.NOTE 3The use of outside threads instead of inside threads as shown in this figure is permissible.9.3 Since there is no accepted reference material suitable for determining the bias for the procedure in this test method, nostatement on bias i
38、s being made.10. Keywords10.1 fineness of hydraulic cementC430 173SUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this test method standard since the last issue,issue (C430 96C430 08 (2015)(2003),) that may impact the use of this test method. standard. (Approved De
39、c.1, 2017December 1, 2008).)(1) Revised 4.1.(1) Added Section 3 (“Terminology”).(2) Added Terminology C125 and C219 to Section 2 (“Referenced Documents”).ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.
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