ASTM_C_1506_-_16b.pdf

Designation:C150616bStandard Test Method forWater Retention of Hydraulic Cement-Based Mortars andPlasters1This standard is issued under the fixed designation C1506;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 provides for the determination of waterretention of hydraulic cement-based mortars and plasters.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.When this test method refers to combined-unitstandards,the selection of the measurement systems is at theusers discretion.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.)22.Referenced Documents2.1 ASTM Standards:3C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C185 Test Method for Air Content of Hydraulic CementMortarC230/C230M Specification for Flow Table for Use in Testsof 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 MaterialsC1437 Test Method for Flow of Hydraulic Cement Mortar3.Summary of Test Method3.1 After initial mixing is complete,the flow of the mortaror plaster is determined.The mortar or plaster is then subjectedto a controlled vacuum suction for 60 s,after which the flow isagain determined.The water retention is the final flow dividedby the initial flow expressed as a percentage.4.Significance and Use4.1 This test method provides a means for determining theability of mortars and plasters to retain water under suction.Test results may be used to determine compliance withspecifications.4.2 The results obtained using this test method can be usedto compare the relative ability of mortars and plasters to retainwater under suction.4.3 The results obtained using this test method for masonrymortars do not necessarily indicate the degree of waterretention when used with masonry units,since the amount ofwater absorbed by the unit depends on the rate of absorption ofthe masonry unit.4.4 The results obtained using this test method for plasters(stucco)do not necessarily indicate the degree of waterretention when the plaster is applied as a second coat on thesurface of a previously applied plaster base coat,since theamount of water absorbed from the second coat of plasterdepends on the rate of absorption of the base coat.This is alsotrue when a plaster is applied as a coating on masonry units.5.Apparatus5.1 Tamper,conforming to Test Method C109/C109M.5.2 Straightedge,conforming to Test Method C185.5.3 Flow Table,conforming to Specification C230/C230M.5.4 Mixing Apparatus,conforming to the requirements pre-scribed in Practice C305.5.5 Filtration Assembly,an apparatus essentially as shownin Fig.1 shall be used.This apparatus consists of a perforateddish resting on a funnel,which is connected by a three-way1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.22 on Workability.Current edition approved Dec.1,2016.Published December 2016.Originallyapproved in 2001.Last previous edition approved in 2016 as C1506 16a.DOI:10.1520/C1506-16B.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 stopcock to a vacuum flask,to which a controlled vacuum isapplied.The perforated dish shall be made of metal notattacked by masonry mortar or plaster(Note 1).The metal baseof the dish shall have a thickness of 2.0 6 0.3 mm and shallconform to the requirements given in Fig.1.The stopcock boreshall have a 4.0 6 0.5-mm diameter,and the connecting glasstubing shall have a minimum inside diameter of 4 mm.Thelength of the tubing projecting into the 1-L flask from thestopcock shall extend at least 25 mm below the center line ofthe va