1、Designation: C266 15Standard Test Method forTime of Setting of Hydraulic-Cement Paste by GillmoreNeedles1This standard is issued under the fixed designation C266; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 time ofsetting of hydraulic-cement paste by means of the Gillmoreneedles.1.2
3、 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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 establish appro-p
4、riate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Warning: Fresh hydraulic cementitious mixtures are causticand may cause chemical burns to skin and tissue uponprolonged exposure.21.4 The text of this standard references notes and footnoteswhic
5、h provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be consideredas requirements of the standard.2. Referenced Documents2.1 ASTM Standards:3C151 Test Method for Autoclave Expansion of HydraulicCementC183 Practice for Sampling and the Amount of T
6、esting ofHydraulic CementC187 Test Method for Amount of Water Required for Nor-mal Consistency of Hydraulic Cement PasteC219 Terminology Relating to Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC511 Specification for Mixing Rooms, Mo
7、ist Cabinets,Moist Rooms, and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in th
8、e PhysicalTesting of Hydraulic CementsD1193 Specification for Reagent Water3. Terminology3.1 Refer to Terminology C219 for definitions of terms.4. Summary of Test Method4.1 Sufficient water is added to the cement that is beingtested to produce a paste of normal consistency. A specimen ismolded from
9、this paste and is tested for time of setting bymeans of the Gillmore initial and final needles. The initial timeof setting is the time elapsed between initial contact of cementand water and the time when the Gillmore Initial needle doesnot leave a complete circular impression in the paste surface.Th
10、e final time of setting is the time elapsed between initialcontact of cement and water and the time when the GillmoreFinal needle does not leave a complete circular impression inthe paste surface.5. Significance and Use5.1 The purpose of this test method is to establish whethera cement complies with
11、 a specification limit on Gillmore timeof setting.6. Apparatus6.1 Flat Trowel, having a sharpened straight-edged steelblade 100 to 150 mm in length. The edges when placed on aplane surface shall not depart from straightness by more than 1mm.6.2 Mixer, Bowl, Paddle, and Scraper, conforming to therequ
12、irements of Practice C305.6.3 Glass Graduates, 200 or 250 mL capacity, conformingto the requirements of Specification C1005.1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.30 on Time of SetCurrent edition approved Dec. 1
13、, 2015. Published December 2015. Originallyapproved in 1951. Last previous edition approved in 2013 as C266 13. DOI:10.1520/C0266-15.2Section on Safety, Manual of Cement Testing, Annual Book of ASTMStandards, Vol 04.01.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact A
14、STM 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, West Consho
15、hocken, PA 19428-2959. United States16.4 Mass Determining Devices, conforming to the require-ments of Specification C1005. The devices for determiningmass shall be evaluated for precision and accuracy at a totalload of 1000 g.6.5 Plane Non-absorptive Plates, 100 mm 6 5 mm square,of similar planeness
16、, corrosivity, and absorptivity to that ofglass (see Test Method C187 Fig. 1, item H).6.6 Gillmore Needles, conforming to the following require-ments:6.6.1 The initial time of setting needle shall have a mass of113.4 6 0.5 g and a tip diameter of 2.12 6 0.05 mm.6.6.2 The final time of setting needle
17、 shall have a mass of453.6 6 0.5 g and a tip diameter of 1.06 6 0.05 mm.6.6.3 The needle tips shall be cylindrical for a distance of4.8 6 0.5 mm. The needle ends shall be plane and at rightangles to the axis of the rod and shall be maintained in a cleancondition (See Note 1).6.7 Inspect and document
18、 Section 6 apparatus for confor-mance to the requirements of this test method at least every212 years.NOTE 1The Gillmore needles should preferably be mounted as shownin Fig. 1 (b).7. Reagents7.1 Mixing WaterPotable water is satisfactory for routinetests. For all referee and cooperative tests, reagen
19、t waterFIG. 1 Gillmore Apparatus and Test SpecimenC266 152conforming to the requirements of Specification D1193 forType III or Type IV grade of reagent water shall be used.8. Sampling8.1 When the test is part of acceptance testing, sample thecement in accordance with Practice C183.9. Conditioning9.1
20、 Maintain the temperature of the room, dry materials,paddle, bowl, and plane non-absorptive plates at 23.0 6 3.0 C.Maintain the temperature of the mixing water at 23.0 6 2.0 C.9.2 Maintain the relative humidity of the mixing room at notless than 50%.9.3 The moist cabinet or moist room shall conform
21、to therequirements of Specification C511.10. Procedure10.1 Preparation of Cement Paste: Obtain the cement pasteused for determination of the time of setting from one of thefollowing methods:10.1.1 Prepare a new batch of paste by mixing 650 g ofcement with the percentage of mixing water required forn
22、ormal consistency (Test Method C187), following the proce-dure described in Practice C305.10.1.2 At the option of the tester, use the paste remainingfrom the batch used for the autoclave expansion specimen (TestMethod C151) or from the normal consistency determination(Test Method C187).10.2 Molding
23、Test SpecimenFrom the cement paste pre-pared as described in 10.1, make a pat with a flat top and thesides tapering to a thin edge on a plane non-absorptive plate,conforming to the dimensions and tolerances in Fig. 1 (a). Inmolding the pat, flatten the cement paste first on the plate andthen form th
24、e pat by drawing the trowel from the outer edgetoward the center, then flattening the top. After making, placethe pat in the moist cabinet or moist room and allow it toremain there except when the determinations of time of settingare being made.10.3 Time of Setting DeterminationDetermine the time of
25、setting by holding the needle in a vertical position and lightlyapplying it to the surface of the pat.10.3.1 Using the Initial Gillmore needle, determine theGillmore Initial time of setting end point to be the firstpenetration measurement that does not mark the specimensurface with a complete circul
26、ar impression. Verify Initial setby obtaining two additional penetration measurements ondifferent areas of the specimen surface. Verification measure-ments must be obtained within 90 s of the first “initial set”measurement. The elapsed time, in minutes, between the timeof contact of cement and mixin
27、g water and the end pointdetermined above is the Gillmore initial time of setting.10.3.2 Using the Final Gillmore needle, determine theGillmore Final time of setting end point to be the firstpenetration measurement that does not mark the specimensurface with a complete circular impression. Verify Fi
28、nal set byobtaining two additional penetration measurements on differentareas of the specimen surface. Verification measurements mustbe obtained within 90 s of the first “final set” measurement.The elapsed time, in minutes, between the time of contact ofcement and mixing water and the end point dete
29、rmined aboveis the Gillmore final time of setting.11. Report11.1 Report the time of setting, to the nearest 5 min, asfollows:Initial Time of Setting, GillmoreFinal Time of Setting, Gillmore_ min_min12. Precision and Bias12.1 Precision, Gillmore Initial Time of Setting on samplestesting between 100 a
30、nd 341 min. (See Note 2)12.1.1 The single-operator (within laboratory) standard de-viation has been found to be 16 min (1s), therefore, results oftwo properly conducted tests by the same operator on samplesof the same cement should not differ from each other by morethan 44 min (d2s) (1s and d2s are
31、defined in Practice C670).12.1.2 The multi-laboratory standard deviation has beenfound to be 28 min (1s), therefore, results of two properlyconducted tests from two different laboratories should notdiffer from each other by more than 78 min (d2s).12.2 Precision, Gillmore Final Time of Setting on sam
32、plestesting between 239 and 561 min (See Note 2).12.2.1 The single-operator (within laboratory) standard de-viation has been found to be 22 min (1s), therefore, results oftwo properly conducted tests by the same operator on samplesof the same cement should not differ from each other by morethan 62 m
33、in (d2s).12.2.2 The multi-laboratory standard deviation has beenfound to be 46 min (1s), therefore, results of two properlyconducted tests from two different laboratories on samples ofthe same cement should not differ by more than 129 min (d2s).12.3 BiasSince an acceptable reference material suitabl
34、efor determining any bias of this method does not exist, nostatement on bias is being made.NOTE 2This data is based upon CCRL Portland cement round robintest samples 47 to 138 and CCRL Masonry cement round robin testsamples 1 to 46.13. Keywords13.1 gillmore needles; hydraulic cement paste; time ofse
35、ttingC266 153SUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this standard since the last issue (C266 13)that may impact the use of this standard. (Approved Dec. 1, 2015.)(1) Revised 1.2.(2) Revised 6.6.1 6.6.3.(3) Revised Fig. 1.ASTM International takes no positio
36、n respecting the validity of any patent rights asserted in connection with any 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.
37、This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM I
38、nternational Headquarters. Your comments will receive careful consideration 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 sho
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