ASTM_C_1741_-_12.pdf

Designation:C174112Standard Test Method forBleed Stability of Cementitious Post-Tensioning TendonGrout1This standard is issued under the fixed designation C1741;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.Scope1.1 This test method is designed to determine the bleedstability of freshly-mixed cementitious grout under staticpressure.1.2 UnitsThe values stated in SI units are to be regardedas standard.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.(WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2.Referenced Documents2.1 ASTM Standards:3C125 Terminology Relating to Concrete and Concrete Ag-gregatesC938 Practice for Proportioning Grout Mixtures forPreplaced-Aggregate Concrete3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 bleed stability,nof cementitious grout,resistance tobleeding.3.2.2 bleeding,nof cementitious post-tensioning tendongrout,autogenous flow of mixing water within,or its emer-gence from,newly placed grout;caused by the settlement ofthe solid materials within the grout and the filtering action ofstrands and wires when subjected to static pressure andcapillary action.3.2.3 grout,nmixture of cementitious material and water,with or without aggregate and admixtures,proportioned toproduce a pourable consistency without segregation of theconstituents.3.2.4 post-tensioning,adjreferring to a method of pre-stressing in which prestressing steel is tensioned after theconcrete has gained sufficient strength.4.Significance and Use4.1 This test method is designed to evaluate the bleedstability of a freshly-mixed grout under static pressure.It canbe used in both the laboratory to qualify grout materials and inthe field as a quality control test.When used to qualify groutmaterials,replicate tests may be specified.It is intended thatthe test pressure,acceptance criteria,and number of replicatetests be set forth in the contract documents if this test methodis referenced.These values will normally vary depending onthe vertical rise of the post-tensioning tendon.NOTE1Appendix X1 includes a reference for an example of testpressures and bleeding limits.4.2 The procedure for this test was developed by Schokkeret al.4based on previous work by Schupack.55.Apparatus5.1 The apparatus consists of a commercially availablepressure filtration funnel,stand,pressure supply with gauge,pressure regulator,valve,drip wick,and bleed water collectioncontainer as shown in Fig.1 and Fig.2.5.1.1 Filtration FunnelA 47-mm diameter stainless steelpressure filtration funnel with a nominal capacity of 200 mL asshown in Fig.2.The filtration funnel shall have removablethreaded caps at both ends with a stem for connection of the1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.41 on Hydraulic Cement Grouts.Current edition approved June 1,2012.Published July 2012.Originally approvedin 2011.Last previous edition approved in 2011 as C1741 11a.DOI:10.1520/C1741-12.2Section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol 04.02.3For 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.4Schokker,A.J.,Koester,B.D.,Breen,J.E.,and Kreger,M.E.,“Developmentof High Performance Grouts for Bonded Post-Tensioned Structures,”ResearchReport 1405-2,Center for Transportation Research,October 1999.5Schupack,M.“Admixture for Controlling Bleed in Cement Grout Used inPost-Tensioning,”Precast/Prestressed Concrete Institute Journal,Nov.Dec.1974,pp.110.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 gas supply and a 7.0 6 0.5 mm inside diameter stem 90 6 1mm long for escape of water.The base of the vessel shallcontain a 35 6 1 mm diameter stainless steel 45 m(No.325)screen that supports a 47 mm diameter Type A/E borosilicateglass filter(1-m pore size)as shown in Fig.2.The screen shallbe inserted with the woven side against the glass filter,and thefunnel gasket shall be placed above the glass filter as shown inFig.2.The glass filter shall cover the screen across the in