ASTM C266-2018 Standard Test Method for Time of Setting of Hydraulic-Cement Paste by Gillmore Needles.pdf

《ASTM C266-2018 Standard Test Method for Time of Setting of Hydraulic-Cement Paste by Gillmore Needles.pdf》由会员分享，可在线阅读，更多相关《ASTM C266-2018 Standard Test Method for Time of Setting of Hydraulic-Cement Paste by Gillmore Needles.pdf（4页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: C266 15C266 18Standard 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 l

2、ast 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 time of setting of hydraulic-cement paste by means of the Gillmore ne

3、edles.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.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 to estab

4、lish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.Warning: Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolongedexposure.21.4 The text of this standard references notes and foo

5、tnotes which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in

6、the Decision 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:3C151C151/C151M Test Method for Autoclave Expansion of Hydraulic CementC18

7、3C183/C183M Practice for Sampling and the Amount of Testing of Hydraulic CementC187 Test Method for Amount of Water Required for Normal Consistency of Hydraulic Cement PasteC219 Terminology Relating to Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plas

8、tic ConsistencyC511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of HydraulicCements and ConcretesC670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction MaterialsC1005 Specification for Reference Masses

9、and Devices for Determining Mass and Volume for Use in the Physical Testing ofHydraulic 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 being tested to produc

10、e a paste of normal consistency. A specimen is moldedfrom this paste and is tested for time of setting by means of the Gillmore initial and final needles. The initial time of setting is thetime elapsed between initial contact of cement and water and the time when the Gillmore Initial needle does not

11、 leave a complete1 This test method is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.30 on Time of SetCurrent edition approved Dec. 1, 2015Oct. 1, 2018. Published December 2015October 2018. Originally approved in 1951. Last previous editi

12、on approved in 20132015as C266 13.C266 15. DOI: 10.1520/C0266-15.10.1520/C0266-18.2 Section on Safety, Manual of Cement Testing, Annual Book of ASTM Standards, Vol 04.01.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annua

13、l Book of ASTM Standardsvolume 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 t

14、echnically possible 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 t

15、his standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1circular impression in the paste surface. The final time of setting is the time elapsed between initial contact of cement and waterand the time when the Gillmore Final needle

16、 does not leave a complete circular impression in the paste surface.5. Significance and Use5.1 The purpose of this test method is to establish whether a cement complies with a specification limit on Gillmore time ofsetting.6. Apparatus6.1 Flat Trowel, having a sharpened straight-edged steel blade 10

17、0 to 150 mm in length. The edges when placed on a planesurface shall not depart from straightness by more than 1 mm.1 mm.6.2 Mixer, Bowl, Paddle, and Scraper, conforming to the requirements of Practice C305.6.3 Glass Graduates, 200 or 250 mL capacity, conforming to the requirements of Specification

18、C1005.6.4 Mass Determining Devices, conforming to the requirements of Specification C1005. The devices for determining mass shallbe evaluated for precision and accuracy at continuing precise performance utilizing the procedure in Specification C1005a totalload of 1000 g., Appendix X1, using a verifi

19、cation check mass of approximately 1000 g.6.5 Plane Non-absorptive Plates, 100 mm 6 5 mm square, of similar planeness, corrosivity, and absorptivity to that of glass(see Test Method C187 Fig. 1, item H).6.6 Gillmore Needles, conforming to the following requirements:6.6.1 The initial time of setting

20、needle shall have a mass of 113.4 6 0.5 g and a tip diameter of 2.12 6 0.05 mm.6.6.2 The final time of setting needle shall have a mass of 453.6 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 of 4.8 6 0.5 mm. The needle ends shall be plane and

21、at right anglesto the axis of the rod and shall be maintained in a clean condition (See Note 1).6.7 Inspect and document Section 6 apparatus for conformance to the requirements of this test method at least every 2 212years.years (see Note 2).NOTE 1The Gillmore needles should preferably be mounted as

22、 shown in Fig. 1 (b).NOTE 2Specification C1005 requires annual compliance checks for the reference masses and for the devices for determining mass.7. Reagents7.1 Mixing WaterPotable water is satisfactory for routine tests. For all referee and cooperative tests, reagent water conformingto the require

23、ments of Specification D1193 for Type III or Type IV grade of reagent water shall be used.8. Sampling8.1 When the test is part of acceptance testing, sample the cement in accordance with Practice C183C183/C183M.9. Conditioning9.1 Maintain the temperature of the room, dry materials, paddle, bowl, and

24、 plane non-absorptive plates at 23.0 6 3.0 C. 3.0C.Maintain the temperature of the mixing water at 23.0 6 2.0 C.2.0C.9.2 Maintain the relative humidity of the mixing room at not less than 50%.9.3 The moist cabinet or moist room shall conform to the requirements of Specification C511.10. Procedure10.

25、1 Preparation of Cement Paste: Obtain the cement paste used 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 of cement with the percentage of mixing water required for normalconsistency (Test Method C187), following the pro

26、cedure described in Practice C305.10.1.2 At the option of the tester, use the paste remaining from the batch used for the autoclave expansion specimen (TestMethod C151C151/C151M) or from the normal consistency determination (Test Method C187).10.2 Molding Test SpecimenFrom the cement paste prepared

27、as described in 10.1, make a pat with a flat top and the sidestapering to a thin edge on a plane non-absorptive plate, conforming to the dimensions and tolerances in Fig. 1 (a). In molding thepat, flatten the cement paste first on the plate and then form the pat by drawing the trowel from the outer

28、edge toward the center,then flattening the top. After making, place the pat in the moist cabinet or moist room and allow it to remain there except whenthe determinations of time of setting are being made.10.3 Time of Setting DeterminationDetermine the time of setting by holding the needle in a verti

29、cal position and lightlyapplying it to the surface of the pat.C266 18210.3.1 Using the Initial Gillmore needle, determine the Gillmore Initial time of setting end point to be the first penetrationmeasurement that does not mark the specimen surface with a complete circular impression. Verify Initial

30、set by obtaining twoadditional penetration measurements on different areas of the specimen surface.Verification measurements must be obtained within90 s of the first “initial set” measurement. The elapsed time, in minutes, between the time of contact of cement and mixing waterand the end point deter

31、mined above is the Gillmore initial time of setting.10.3.2 Using the Final Gillmore needle, determine the Gillmore Final time of setting end point to be the first penetrationmeasurement that does not mark the specimen surface with a complete circular impression. Verify Final set by obtaining twoaddi

32、tional penetration measurements on different areas of the specimen surface.Verification measurements must be obtained within90 s of the first “final set” measurement. The elapsed time, in minutes, between the time of contact of cement and mixing waterand the end point determined above is the Gillmor

33、e final time of setting.11. Report11.1 Report the time of setting, to the nearest 5 min, as follows:Initial Time of Setting, GillmoreFinal Time of Setting, Gillmore_ min_min12. Precision and Bias12.1 Precision, Gillmore Initial Time of Setting on samples testing between 100 and 341 min. (See Note 23

34、)FIG. 1 Gillmore Apparatus and Test SpecimenC266 18312.1.1 The single-operator (within laboratory) standard deviation has been found to be 16 min (1s), therefore, results of twoproperly conducted tests by the same operator on samples of the same cement should not differ from each other by more than

35、44min (d2s) (1s and d2s are defined in Practice C670).12.1.2 The multi-laboratory standard deviation has been found to be 28 min (1s), therefore, results of two properly conductedtests from two different laboratories should not differ from each other by more than 78 min (d2s).12.2 Precision, Gillmor

36、e Final Time of Setting on samples testing between 239 and 561 min (See Note 23).12.2.1 The single-operator (within laboratory) standard deviation has been found to be 22 min (1s), therefore, results of twoproperly conducted tests by the same operator on samples of the same cement should not differ

37、from each other by more than 62min (d2s).12.2.2 The multi-laboratory standard deviation has been found to be 46 min (1s), therefore, results of two properly conductedtests from two different laboratories on samples of the same cement should not differ by more than 129 min (d2s).12.3 BiasSince an acc

38、eptable reference material suitable for determining any bias of this method does not exist, no statementon bias is being made.NOTE 3This data is based upon CCRL Portland cement round robin test samples 47 to 138 and CCRL Masonry cement round robin test samples 1to 46.13. Keywords13.1 gillmore needle

39、s; hydraulic cement paste; time of settingSUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this standard since the last issue (C266 15)that may impact the use of this standard. (Approved Oct. 1, 2018.)(1) Revised 6.4 and 6.7.(2) Added Note 2 and renumbered subsequen

40、t Notes accordingly.SUMMARY 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

41、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 validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsi

42、bility.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

43、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 not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the addre

44、ss 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 184