1、Designation: C 807 08Standard Test Method forTime of Setting of Hydraulic Cement Mortar by ModifiedVicat Needle1This standard is issued under the fixed designation C 807; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、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 time ofsetting of hydraulic cement mortar by means of the modifiedVi
3、cat needle.1.2 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 est
4、ablish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. (WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.The use of gloves, protective clothing, and eye pro
5、tection isrecommended. Wash contact area with copious amounts ofwater after contact. Wash eyes for a minimum of 15 min.Avoidexposure of the body to clothing saturated with the liquid phaseof the unhardened material. Remove contaminated clothingimmediately after exposure.)1.4 The text of this standar
6、d 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 Standards:2C 109/C 109M Test Method for Compressive Strength ofHydraulic Cement
7、Mortars (Using 2-in. or 50-mm CubeSpecimens)C 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 CementPastes and Mortars of P
8、lastic 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 778 Specification for Standard SandC
9、845 Specification for Expansive Hydraulic CementC 1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsD 1193 Specification for Reagent Water3. Terminology3.1 Terms used in this standard are defined in TerminologyC 219.
10、4. Summary of Test Method4.1 A mortar is prepared with the cement to be tested, usingstipulated quantities of cement and water, and sufficient stan-dard sand to produce a required consistency as determined bya stipulated penetration using the plunger of the modified Vicatapparatus. Mortar of the pro
11、per consistency is then tested fortime of setting, using the needle of the modified Vicatapparatus for the determination of a stipulated penetration. Thetime required to obtain the stipulated penetration of themodified Vicat needle is the time of setting.5. Significance and Use5.1 The purpose of thi
12、s test method is to establish whetheror not a cement complies with a specification limit on time ofsetting. It has been found to be particularly applicable for thedetermination of the setting time of expansive cements (seeSpecification C 845).6. Apparatus6.1 Tamper and Trowel, conforming to the requ
13、irements ofTest Method C 109/C 109M. In addition, the edges of thetrowel when placed on a plane surface shall not depart fromstraightness by more than 1 mm.1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.30 on Time of Se
14、t.Current edition approved June 1, 2008. Published July 2008. Originally approvedin 1975. Last previous edition approved in 2005 as C 807 05.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volu
15、me information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Vicat Apparatus, conforming to the
16、requirements of TestMethod C 187, with the following modifications:6.2.1 For consistency determination, the plunger end of themovable rod shall be 17.5 6 0.5 mm in diameter instead of 10mm, and the total mass of the movable rod (including the17.5-mm plunger) shall be 400 6 0.5 g.6.2.2 For time of se
17、tting determination, a 2 6 0.05-mmstainless steel needle shall be substituted for the 1-mm needle.The total mass of the movable rod with the 2-mm needle shallbe 300 6 0.5 g.6.3 Mold for Consistency and Setting TimeA smoothcylindrical brass ring 76 6 0.5 mm inside diameter (3-in. brasstubing) by 40 6
18、 1 mm deep, cemented to a plane, non-absorptive plate, or smooth cylindrical brass cups having theabove dimensions.6.4 Mixer, Bowl, Paddle, and Scraper, conforming to therequirements of Practice C 305.6.5 Glass Graduates, conforming to the requirements ofSpecification C 1005.6.6 Masses and Mass Dete
19、rmining Devices, conforming tothe requirements of Specification C 1005. The devices fordetermining mass shall be evaluated for precision and accuracyat a total load of 1000 g.7. Reagents and Materials7.1 Graded Standard Sand, conforming to the requirementsof Specification C 778.7.2 Mixing WaterPotab
20、le water 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
21、 with Practice C 183.9. Conditioning9.1 Maintain the temperature of the room, dry materials,paddle, bowl, and molds at 23.0 6 3.0 C.9.2 Maintain the temperature of the mixing water at 23.0 62.0 C9.3 The relative humidity of the mixing room shall not beless than 50 %.9.4 The moist closet or moist roo
22、m shall be in accordancewith Specification C511.10. Procedure10.1 Preparation of Mortar:10.1.1 Mix 750 g of cement, 375 mL of water, and thequantity of graded standard sand required to give the consis-tency specified below under “Test for Consistency” in accor-dance with the mortar mixing procedure
23、described in PracticeC 305.10.1.2 Upon completion of mixing, place a layer of mortarabout 20 mm in thickness in the mold and puddle with thetamper. Hold the tamper with the 25-mm side parallel to theradius of the mold for 14 strokes spaced equally around theoutside of the mold. Apply an additional f
24、our strokes to thecenter of the specimen with the longitudinal axis of the tamperat the center of the mold and rotate the tamper 45 betweeneach stroke. Then fill the mold to overflowing with mortar andpuddle as specified for the first layer. Cut off the mortar to aplane surface flush with the top of
25、 the mold in two operations.First, with the trowel held at about a 20 angle, start at one sideof the mold, 10 mm above the mold, and finish the stroke bycutting the mortar off the top of the mold at the opposite side.Second, starting from the opposite direction, cut the mortarflush with the top of t
26、he mold by drawing the straight edge ofthe trowel (held nearly perpendicular to the mold) with asawing motion across the top of the mold.10.2 Test for ConsistencyCenter the mortar confined inthe mold under the movable rod of the modified Vicatapparatus described above. Bring the plunger in contact w
27、iththe surface of the mortar and tighten the setscrew. Then set themovable indicator to the upper zero mark on the scale, or takean initial reading, and release the rod 35 to 50 s after startingto fill the mold. The mortar shall have the desired consistencywhen the rod settles to a point 20 6 4 mm b
28、elow the originalsurface 30 s after being released. Cover the bowl containing theremainder of the mortar with the lid while the consistency testis being made. Make trial mortars with varying percentages ofstandard sand until the desired consistency is obtained.10.3 Test for Time of SettingMix the mo
29、rtar remaining inthe bowl at medium speed (285 6 10 rpm) for 30 s after it hasbeen found that the mortar has the proper consistency. Follow-ing the completion of the mixing, mold the test specimen asspecified above. Immediately after molding, place the testspecimen in the moist closet or moist room
30、where it shallremain except when penetration tests are being made. Allowthe time of setting specimen to remain in the moist closet ormoist room for 30 min without being disturbed. Then, using themodified Vicat apparatus described above, bring the needle incontact with the surface of the mortar and t
31、ighten the setscrew.Set the movable indicator to the upper zero mark on the scale,or take an initial reading. Release the rod quickly by releasingthe setscrew, and allow the needle to settle for 30 s. Determinethe penetration of the needle at this time and every 30 minthereafter until the needle fai
32、ls to penetrate to the bottom of themold. Then, take penetration tests every 10 min until apenetration of 10 mm or less is obtained. Perform no penetra-tion test closer than 10 mm from any previous penetration testor from the inside edge of the mold. Record the results of allpenetration tests, and,
33、by interpolation, determine the timewhen a penetration of 10 mm is obtained. The difference, inminutes, between the time of contact of cement and water inthe mortar mixing procedure and the time a penetration of 10mm is obtained is the time of setting.10.4 PrecautionsMaintain testing apparatus on a
34、rigidsurface, free of vibration during the penetration test. Do not oilthe plunger of the Vicat apparatus at any time, but keep theplunger and guide bearing clean at all times.C80708211. Calculation11.1 Calculate the time of setting to the nearest one minuteas follows:SSH E!C D!D3 C 10!D1 E (1)where
35、:E = time in minutes of last penetration greater than 10 mm,H = time in minutes of first penetration less than 10 mm,C = penetration reading at Time E, andD = penetration reading at Time H.12. Report12.1 Report the time of setting in minutes, to the nearest oneminute.13. Precision and Bias13.1 The m
36、ultilaboratory standard deviation has been foundto be 15.2 min. Therefore, the results of two properly con-ducted tests from two different laboratories on samples of thesame cement should not differ by more than 43 min.(See Note 1)13.2 No information can be presented on the bias of theprocedure in t
37、his test method for measuring time of settingbecause no material having an accepted reference value isavailable.NOTE 1These numbers represent, respectively, the 1s and d2s limitsas defined in Practice C 670.14. Keywords14.1 hydraulic-cement mortar; time of setting; Vicat needle,expansiveSUMMARY OF C
38、HANGESCommittee C01 has identified the location of selected changes to this test method since the last issue,C 807 05, that may impact the use of this test method. (Approved June 1, 2008)(1) Editorially revised the units statement in 1.2 to conform toASTM Form and Style.(2) Revised 6.1, 6.6, and 9.3
39、.(3) Editorially revised 11.1 and 12.1.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 validity of any such patent rights, and the
40、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 comments are invited either for revision of
41、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 not received a fair hearing you shouldma
42、ke 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).C807083
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