1、Designation: C807 13C807 18Standard 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 safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use. (WarningFresh hydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)1.4 The text
5、of this 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.1.5 This international standard was developed in accordance with internationally recognized pri
6、nciples on standardizationestablished in 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:3C109/C109M Test Method for Compr
7、essive Strength of Hydraulic Cement Mortars (Using 2-in. or 50-mm Cube Specimens)C183C183/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 Ceme
8、ntC305 Practice for Mechanical Mixing 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
9、for Test Methods for Construction MaterialsC778 Specification for Standard SandC845C845/C845M 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 Re
10、agent Water3. Terminology3.1 Terms used in this standard 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 s
11、tipulated penetration using the plunger of the modified 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 Dec. 1, 2013Oct. 1, 2018. Published January 2014October
12、 2018. Originally approved in 1975. Last previous edition approved in 20082013 asC807 08.C807 13. DOI: 10.1520/C0807-13.10.1520/C0807-18.2 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
13、, or contactASTM Customer Service at serviceastm.org. For 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
14、 have been made to the previous version. Becauseit may not 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
15、 document.*A Summary of Changes section appears at the end 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 app
16、aratus for thedetermination of a stipulated penetration. 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
17、 time of setting.It has been found to be particularly applicable for the determination of the setting time of expansive cements (see SpecificationC845C845/C845M).6. Apparatus6.1 Tamper and Trowel, conforming to the requirements of Test Method C109/C109M. In addition, the edges of the trowel whenplac
18、ed on a plane surface shall not depart from straightness by more than 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 1
19、0 mm,10 mm, and the total mass of the movable rod (including the 17.5-mm 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.
20、3 Mold for Consistency and Setting TimeA smooth cylindrical brass ring 76 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 re
21、quirements of Practice C305.6.5 Glass Graduates, conforming to the requirements 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 continuing precise p
22、erformance utilizing the procedure inSpecification C1005a total load of , Appendix X1, using a verification check mass of approximately 1000 g.7. Reagents and Materials7.1 Graded Standard Sand, conforming to the requirements of Specification C778.7.2 Mixing WaterPotable water is satisfactory for rou
23、tine 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 part of acceptance testing, sample the cement in accordance with Practice C183C183/C183M.
24、9. Conditioning9.1 Maintain the temperature of the room, dry materials, paddle, bowl, and molds at 23.0 6 3.0 C. 3.0C.9.2 Maintain the temperature of the mixing water at 23.0 6 2.0 C2.0C9.3 The relative humidity of the mixing room shall not be less than 50 %.9.4 The moist closet or moist room shall
25、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 Consistency” in accordance with the mortar mixing procedure described
26、 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 equally around the outside of themold. Apply an additional four str
27、okes 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 layer. Cut off the mortar to a plane surface flush with the top of the
28、 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 from the opposite direction, cut the mortar flush with the top of th
29、e 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 modified Vicat apparatusdescribed above. Bring the plunger in contact
30、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 have the desired consistency when the rod settles to a point 20 6 4
31、mm below the original surface 30 s 30 s afterC807 182being released. Cover the bowl containing the remainder of the mortar with the lid while the consistency test is being made. Maketrial mortars with varying percentages of standard sand until the desired consistency is obtained.10.3 Test for Time o
32、f 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. Immediately after molding, place the test specimen in the moist c
33、loset 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 apparatus described above, bring the needle in contact with the surfa
34、ce 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 penetration of the needle at thistime and every 30 min thereaf
35、ter 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 or from the inside edge of the mold. Record the results of all
36、 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 10 mm is obtained is the time of setting.10.4 PrecautionsMaint
37、ain 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 18311. Calculation11.1 Calculate the time of setting to the nearest one minute as follows:
38、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 Report the time of setting in minutes, to the nearest one minute
39、.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 more than 43 min.(See Note 1)13.2 No information can be presented
40、 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 C670.14. Keywords14.1 hydraulic-cement mortar; time of setting;
41、 Vicat needle, expansiveSUMMARY OF CHANGESCommittee C01 has identified the location of selected changes to this test method standard since the last issue,issue (C807 08C807 13,) that may impact the use of this test method. standard. (Approved Dec. 1, 2013Oct.1, 2018).)(1) Revised warning statement i
42、n 6.6.1.3 and added Footnote 2.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 riskof i
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