1、Designation:C19113American Association StateHighway and Transportation Officials StandardAASHTO No.:T131Standard Test Methods forTime of Setting of Hydraulic Cement by Vicat Needle1This standard is issued under the fixed designation C191;the number immediately following the designation indicates the
2、 year oforiginal adoption or,in the case of revision,the year 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 These test methods determine the time of setting ofhydrau
3、lic cement by means of the Vicat needle.Two testmethods are given;Method A is the Reference Test Methodusing the manually operated standard Vicat apparatus,whileMethod B permits the use of an automatic Vicat machine thathas,in accordance with the qualification requirements of thismethod,demonstrated
4、 acceptable performance.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 standa
5、rd 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 caus-tic and may cause chemical burns to skin and tissue uponprolonged exposure.21.4 The text of this standard references
6、 notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.NOTE1For the method for determining the time of setting byGillmore needles,see Test Method C266.2.Referenced Documents2.1 ASTM
7、 Standards:3C150 Specification for Portland CementC151 Test Method for Autoclave Expansion of HydraulicCementC183 Practice for Sampling and the Amount of Testing ofHydraulic CementC187 Test Method for Amount of Water Required for Nor-mal Consistency of Hydraulic Cement PasteC219 Terminology Relating
8、 to Hydraulic CementC266 Test Method for Time of Setting of Hydraulic-CementPaste by Gillmore NeedlesC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesti
9、ng of Hydraulic Cements and ConcretesC595 Specification for Blended Hydraulic CementsC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsC1157 Performance Specification for Hydraulic CementD1193 Specification for Reag
10、ent Water3.Terminology3.1 DefinitionsThe terms used in this test method aredefined in accordance with Terminology C219.4.Summary of Test Method4.1 A paste that is proportioned and mixed to normalconsistency,as described in the Test Method C187,is moldedand placed in a moist cabinet and allowed to st
11、art setting.Periodic penetration tests are performed on this paste byallowing a 1-mm Vicat needle to settle into this paste.TheVicat initial time of setting is the time elapsed between theinitial contact of cement and water and the time when thepenetration is measured or calculated to be 25 mm.The V
12、icatfinal time of setting is the time elapsed between initial contactof cement and water and the time when the needle does notleave a complete circular impression in the paste surface.5.Significance and Use5.1 This test method provides a means of determiningcompliance with a specification limit for
13、Vicat time of setting.Refer to the appropriate specification for the cement todetermine if this test method is used for specification compli-ance.1These test methods are under the jurisdiction of ASTM Committee C01 onCement and is the direct responsibility of Subcommittee C01.30 on Time of Set.Curre
14、nt edition approved Dec.1,2013.Published January 2014.Originallyapproved in 1944.Last previous edition approved in 2008 as C191 08.DOI:10.1520/C0191-13.2Section on Safety,Manual of Cement Testing,Annual Book of ASTMStandards,Vol 04.01.3For referenced ASTM standards,visit the ASTM website,www.astm.or
15、g,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,Wes
16、t Conshohocken,PA 19428-2959.United States1 5.2 Time of setting measured by this method will notnecessarily provide the same results as the time of setting ofhydraulic cement paste measured by other methods,or the timeof setting of mortar or concrete.6.Apparatus6.1 Vicat ApparatusSee Annex A1.1 and Fig.A1.1.TheVicat apparatus for this test method shall have a movable rod,B,of mass 300 6 0.5g.6.1.1 The end of the rod used for measuring penetrationshall have a straight steel removable needle with
