1、Designation: C 266 08Standard Test Method forTime of Setting of Hydraulic-Cement Paste by GillmoreNeedles1This standard is issued under the fixed designation C 266; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. 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
3、.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, assoc
4、iated with its use. It is theresponsibility of the user of this standard to establish appro-priate 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 ti
5、ssue uponprolonged exposure. The use of gloves, protective clothing,and eye protection is recommended. Wash contact area withcopious amounts of water after contact. Wash eyes for aminimum of 15 min. Avoid exposure of the body to clothingsaturated with the liquid phase of the unhardened material.Remo
6、ve contaminated clothing immediately after exposure.1.4 The text of this standard references notes and footnoteswhich 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
7、Standards:2C 151 Test Method for Autoclave Expansion of HydraulicCementC 183 Practice for Sampling and the Amount of Testing ofHydraulic CementC 187 Test Method for Normal Consistency of HydraulicCementC 219 Terminology Relating to Hydraulic CementC 305 Practice for Mechanical Mixing of Hydraulic Ce
8、mentPastes and Mortars of Plastic ConsistencyC511 Specification for Mixing Rooms, Moist Cabinets,Moist Rooms, and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC 670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC 1005 Speci
9、fication for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsD 1193 Specification for Reagent Water3. Terminology3.1 Refer to Terminology C 219 for definitions of terms.4. Summary of Test Method4.1 Sufficient water is added to the cement
10、 that is beingtested to produce a paste of normal consistency. A specimen ismolded from 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 Gill
11、more Initial needle doesnot leave a complete circular impression in the paste surface.The 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
12、and Use5.1 The purpose of this test method is to establish whethera cement complies with 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 s
13、traightness by more than 1mm.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 June 1, 2008. Published July 2008. Originally approvedin 1951. Last previous edition approved in 2007
14、 as C 266 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the en
15、d of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Mixer, Bowl, Paddle, and Scraper, conforming to therequirements of Practice C 305.6.3 Glass Graduates, 200 or 250 mL capacity, conformingto the requirements of Spe
16、cification C 1005.6.4 Mass Determining Devices, conforming to the require-ments of Specification C 1005. 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, corrosivity, and
17、 absorptivity to that ofglass (see Test Method C 187 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 of0.250 6 0.001 lb (113.4 6 0.5 g) and a tip diameter of 0.0846 0.002 in. (2.12 6 0.05 mm).6.6.2 The final t
18、ime of setting needle shall have a mass of1.000 6 0.001 lb (453.6 6 0.5 g) and a tip diameter of 0.0426 0.002 in. (1.06 6 0.05 mm).6.6.3 The needle tips shall be cylindrical for a distance of0.189 6 0.020 in. (4.8 6 0.5 mm). The needle ends shall beplane and at right angles to the axis of the rod an
19、d shall bemaintained in a clean condition (See Note 1).6.7 Inspect and document Section 6 apparatus for conform-ance to the requirements of this test method at least every 212years.NOTE 1The Gillmore needles should preferably be mounted as shownin Fig. 1 (b).7. Reagents7.1 Mixing WaterPotable water
20、is satisfactory for routinetests. For all referee and cooperative tests, reagent waterconforming to the requirements of Specification D 1193 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 Pra
21、ctice C 183.9. Conditioning9.1 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 cabine
22、t or moist room shall conform to therequirements of Specification C511.10. Procedure10.1 Preparation of Cement Paste:Obtain the cement paste used for determination of the timeof setting from one of the following methods:10.1.1 Prepare a new batch of paste by mixing 650 g ofcement with the percentage
23、 of mixing water required fornormal consistency (Test Method C 187), following the proce-dure described in Practice C 305.10.1.2 At the option of the tester, use the paste remainingfrom the batch used for the autoclave expansion specimen (TestMethod C 151) or from the normal consistency determinatio
24、n(Test Method C 187).10.2 Molding 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
25、first on the plate andthen form the 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
26、DeterminationDetermine the time ofsetting 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 spec
27、imensurface with a complete circular 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
28、timeof contact of cement and mixing 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 compl
29、ete circular impression. Verify Final 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 m
30、ixing water and the end point determined 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 Setti
31、ng on samplestesting between 100 and 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 more
32、than 44 min (d2s) (1s and d2s are defined in Practice C 670).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, Gi
33、llmore Final Time of Setting on samplestesting between 239 and 561 min (See Note 2).C266082FIG. 1 Gillmore Apparatus and Test SpecimenC26608312.2.1 The single-operator (within laboratory) standard de-viation has been found to be 22 min (1s), therefore, results oftwo properly conducted tests by the s
34、ame operator on samplesof the same cement should not differ from each other by morethan 62 min (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 n
35、ot differ by more than 129 min (d2s).12.3 Bias12.3.1 Since an acceptable reference material suitable fordetermining 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 r
36、ound robin testsamples 1 to 46.13. Keywords13.1 gillmore needles; hydraulic cement paste; time ofsettingSUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this test method since the last issue,C 266 07, that may impact the use of this test method. (Approved June 1, 20
37、08)(1) Revised 4.1, 6.1, 6.4, and 9.2.(2) Revised the units statement in 1.2 and reversed the order ofunits throughout the standard editorially to comply withASTMForm and Style.Committee C01 has identified the location of selected changes to this test method since the last issue,C 266 04, that may i
38、mpact the use of this test method. (Approved July 15, 2007)(1) Added new 6.7.ASTM International takes no position 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 validi
39、ty 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 technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your commen
40、ts are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International 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 no
41、t 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 Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C266084
