ASTM_C_266_-_15.pdf

Designation:C26615Standard 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 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 paste by means of the Gillmoreneedles.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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Warning:Fresh hydraulic cementitious mixtures are causticand may cause chemical burns to skin and tissue uponprolonged exposure.21.4 The text of this standard 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:3C151 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 to Hydraulic CementC305 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 theTesting of Hydraulic Cements and ConcretesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic 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 beingtested to produce a paste of normal consistency.A specimen ismolded from this paste and is tested for time of setting bymeans of the Gillmore initial and final needles.The initial timeof setting is the time elapsed between initial contact of cementand water and the time when the Gillmore Initial needle doesnot leave a complete circular impression in the paste surface.The final time of setting is the time elapsed between initialcontact of cement and water and the time when the GillmoreFinal needle does not leave a complete circular impression inthe paste surface.5.Significance and Use5.1 The purpose of this test method is to establish whethera cement complies with a specification limit on Gillmore timeof setting.6.Apparatus6.1 Flat Trowel,having a sharpened straight-edged steelblade 100 to 150 mm in length.The edges when placed on aplane surface shall not depart from straightness by more than 1mm.6.2 Mixer,Bowl,Paddle,and Scraper,conforming to therequirements of Practice C305.6.3 Glass Graduates,200 or 250 mL capacity,conformingto the requirements of Specification C1005.1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.30 on Time of SetCurrent edition approved Dec.1,2015.Published December 2015.Originallyapproved in 1951.Last previous edition approved in 2013 as C266 13.DOI:10.1520/C0266-15.2Section on Safety,Manual of Cement Testing,Annual Book of ASTMStandards,Vol 04.01.3For referenced ASTM standards,visit the ASTM website,www.astm.org,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,West Conshohocken,PA 19428-2959.United States1 6.4 Mass Determining Devices,conforming to the require-ments of Specification C1005.The devices for determiningmass shall be evaluated for precision and accuracy at a totalload of 1000 g.6.5 Plane Non-absorptive Plates,100 mm 6 5 mm square,of similar planeness,corrosivity,and absorptivity to that ofglass(see Test Method C187 Fig.1,item H).6.6 Gillmore Needles,conforming to the following require-ments:6.6.1 The initial time of setting needle shall have a mass of113.4 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 of453.6 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 of4.8 6 0.5 mm.The needle ends shall be plane and at rightangles to the axis of the rod and shall be maintained in a cleancondition