1、Designation: C807 08C807 13Standard Test Method forTime of Setting of Hydraulic Cement Mortar by ModifiedVicat Needle1This standard is issued under the fixed designation C807; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 time of setting of hydraulic cement mortar by means of the modi
3、fied Vicatneedle.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 standa
4、rd to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. (WarningFresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin andtissue upon prolonged exposure.2The use of gloves, protective clothing, and
5、 eye protection is recommended. Wash contact areawith copious amounts of water after contact. Wash eyes for a minimum of 15 min.Avoid exposure of the body to clothing saturatedwith the liquid phase of the unhardened material. Remove contaminated clothing immediately after exposure.)1.4 The text of t
6、his standard references notes and footnotes which provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.2. Referenced Documents2.1 ASTM Standards:3C109/C109M Test Method for Compressive Strength of Hydra
7、ulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C183 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 Mix
8、ing of Hydraulic Cement Pastes and Mortars of Plastic 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
9、MaterialsC778 Specification for SandC845 Specification for Expansive Hydraulic CementC1005 Specification for Reference Masses and Devices for Determining Mass and Volume for Use in the Physical Testing ofHydraulic CementsD1193 Specification for Reagent Water3. Terminology3.1 Terms used in this stand
10、ard are defined in Terminology C219.4. Summary of Test Method4.1 A mortar is prepared with the cement to be tested, using stipulated quantities of cement and water, and sufficient standardsand to produce a required consistency as determined by a stipulated penetration using the plunger of the modifi
11、ed Vicat apparatus.1 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 Set.Current edition approved June 1, 2008Dec. 1, 2013. Published July 2008January 2014. Originally approved in 1975. Last previous editio
12、n approved in 20052008 asC807 05.C807 08. DOI: 10.1520/C0807-08.10.1520/C0807-13.2 See the 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. Fo
13、r Annual 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 n
14、ot be technically 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 e
15、nd of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1Mortar of the proper consistency is then tested for time of setting, using the needle of the modified Vicat apparatus for thedetermination of a stipulated penetration.
16、 The time required to obtain the stipulated penetration of the modified Vicat needle is thetime of setting.5. Significance and Use5.1 The purpose of this test method is to establish whether or not a cement complies with a specification limit on time of setting.It has been found to be particularly ap
17、plicable for the determination of the setting time of expansive cements (see SpecificationC845).6. Apparatus6.1 Tamper and Trowel, conforming to the requirements of Test Method C109/C109M. In addition, the edges of the trowel whenplaced on a plane surface shall not depart from straightness by more t
18、han 1 mm.6.2 Vicat Apparatus, conforming to the requirements of Test Method C187, with the following modifications:6.2.1 For consistency determination, the plunger end of the movable rod shall be 17.5 6 0.5 mm in diameter instead of 10 mm,and the total mass of the movable rod (including the 17.5-mm
19、plunger) shall be 400 6 0.5 g.6.2.2 For time of setting determination, a 2 6 0.05-mm stainless steel needle shall be substituted for the 1-mm needle. The totalmass of the movable rod with the 2-mm needle shall be 300 6 0.5 g.6.3 Mold for Consistency and Setting TimeA smooth cylindrical brass ring 76
20、 6 0.5 mm inside diameter (3-in. brass tubing)by 40 6 1 mm deep, cemented to a plane, non-absorptive plate, or smooth cylindrical brass cups having the above dimensions.6.4 Mixer, Bowl, Paddle, and Scraper, conforming to the requirements of Practice C305.6.5 Glass Graduates, conforming to the requir
21、ements of Specification C1005.6.6 Masses and Mass Determining Devices, conforming to the requirements of Specification C1005. The devices fordetermining mass shall be evaluated for precision and accuracy at a total load of 1000 g.7. Reagents and Materials7.1 Graded Standard Sand, conforming to the r
22、equirements of Specification C778.7.2 Mixing WaterPotable water is satisfactory for routine tests. For all referee and cooperative tests, reagent water conformingto the requirements of Specification D1193 for Type III or Type IV grade of reagent water shall be used.8. Sampling8.1 When the test is pa
23、rt of acceptance testing, sample the cement in accordance with Practice C183.9. 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 6 2.0 C9.3 The relative humidity of the mixing room sh
24、all not be less than 50 %.9.4 The moist closet or moist room shall be in accordance with Specification C511.10. Procedure10.1 Preparation of Mortar:10.1.1 Mix 750 g of cement, 375 mL of water, and the quantity of graded standard sand required to give the consistencyspecified below under “Test for Co
25、nsistency” in accordance with the mortar mixing procedure described in Practice C305.10.1.2 Upon completion of mixing, place a layer of mortar about 20 mm in thickness in the mold and puddle with the tamper.Hold the tamper with the 25-mm side parallel to the radius of the mold for 14 strokes spaced
26、equally around the outside of themold. Apply an additional four strokes to the center of the specimen with the longitudinal axis of the tamper at the center of themold and rotate the tamper 45 between each stroke. Then fill the mold to overflowing with mortar and puddle as specified forthe first lay
27、er. Cut off the mortar to a plane surface flush with the top of the mold in two operations. First, with the trowel heldat about a 20 angle, start at one side of the mold, 10 mm above the mold, and finish the stroke by cutting the mortar off the topof the mold at the opposite side. Second, starting f
28、rom the opposite direction, cut the mortar flush with the top of the mold bydrawing the straight edge of the trowel (held nearly perpendicular to the mold) with a sawing motion across the top of the mold.10.2 Test for ConsistencyCenter the mortar confined in the mold under the movable rod of the mod
29、ified Vicat apparatusdescribed above. Bring the plunger in contact with the surface of the mortar and tighten the setscrew. Then set the movableindicator to the upper zero mark on the scale, or take an initial reading, and release the rod 35 to 50 s after starting to fill the mold.The mortar shall h
30、ave the desired consistency when the rod settles to a point 20 6 4 mm below the original surface 30 s after beingC807 132released. Cover the bowl containing the remainder of the mortar with the lid while the consistency test is being made. Make trialmortars with varying percentages of standard sand
31、until the desired consistency is obtained.10.3 Test for Time of SettingMix the mortar remaining in the bowl at medium speed (285 6 10 rpm) for 30 s after it has beenfound that the mortar has the proper consistency. Following the completion of the mixing, mold the test specimen as specifiedabove. Imm
32、ediately after molding, place the test specimen in the moist closet or moist room where it shall remain except whenpenetration tests are being made.Allow the time of setting specimen to remain in the moist closet or moist room for 30 min withoutbeing disturbed. Then, using the modified Vicat apparat
33、us described above, bring the needle in contact with the surface of themortar and tighten the setscrew. Set the movable indicator to the upper zero mark on the scale, or take an initial reading. Releasethe rod quickly by releasing the setscrew, and allow the needle to settle for 30 s. Determine the
34、penetration of the needle at thistime and every 30 min thereafter until the needle fails to penetrate to the bottom of the mold. Then, take penetration tests every10 min until a penetration of 10 mm or less is obtained. Perform no penetration test closer than 10 mm from any previouspenetration test
35、or from the inside edge of the mold. Record the results of all penetration tests, and, by interpolation, determinethe time when a penetration of 10 mm is obtained. The difference, in minutes, between the time of contact of cement and waterin the mortar mixing procedure and the time a penetration of
36、10 mm is obtained is the time of setting.10.4 PrecautionsMaintain testing apparatus on a rigid surface, free of vibration during the penetration test. Do not oil theplunger of the Vicat apparatus at any time, but keep the plunger and guide bearing clean at all times.C807 13311. Calculation11.1 Calcu
37、late the time of setting to the nearest one minute as follows:SSH 2E!C2D!D 3C 210!D1E (1)where: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 Re
38、port the time of setting in minutes, to the nearest one minute.13. Precision and Bias13.1 The multilaboratory standard deviation has been found to be 15.2 min. Therefore, the results of two properly conductedtests from two different laboratories on samples of the same cement should not differ by mor
39、e than 43 min.(See Note 1)13.2 No information can be presented on the bias of the procedure in this test method for measuring time of setting becauseno material having an accepted reference value is available.NOTE 1These numbers represent, respectively, the 1s and d2s limits as defined in Practice C
40、670.14. Keywords14.1 hydraulic-cement mortar; time of setting; Vicat needle, expansiveSUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this test method since the last issue,C807 05C807 08, that may impact the use of this test method. (Approved Dec. 1, 2013June 1, 20
41、08)(1) Editorially revised the units statement in 1.2 to conform to ASTM Form and Style.(1) Revised warning statement in 1.3 and added Footnote 2.(2) Revised 6.1, 6.6, and 9.3.(3) Editorially revised 11.1 and 12.1.ASTM International takes no position respecting the validity of any patent rights asse
42、rted 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.This standard is subject to revision at any time by
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44、e 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 shown below.This standard is copyrighted by ASTM Intern
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