ASTM_C_398_-_98_2012.pdf

Designation:C39898(Reapproved 2012)Standard Practice for Use ofHydraulic Cement Mortars in Chemical-Resistant Masonry1This standard is issued under the fixed designation C398;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 practice provides recommendations for use ofhydraulic cement mortars for chemical-resistant masonry con-struction.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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.2.Referenced Documents2.1 ASTM Standards:2C144 Specification for Aggregate for Masonry MortarC150 Specification for Portland CementC171 Specification for Sheet Materials for Curing ConcreteC267 Test Methods for Chemical Resistance of Mortars,Grouts,and Monolithic Surfacings and Polymer ConcretesC279 Specification for Chemical-Resistant Masonry UnitsC309 Specification for Liquid Membrane-Forming Com-pounds for Curing ConcreteC404 Specification for Aggregates for Masonry GroutC595 Specification for Blended Hydraulic CementsC904 Terminology Relating to Chemical-Resistant Nonme-tallic MaterialsD226 Specification for Asphalt-Saturated Organic Felt Usedin Roofing and WaterproofingD227 Specification for Coal-Tar-Saturated Organic FeltUsed in Roofing and Waterproofing3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,see Terminology C904.FLOORS AND CONSTRUCTION UNITS4.Preparation of Concrete Fill or Subbase4.1 In new construction,the surface of the concrete fill shallbe free of mortar drippings,projecting joints,etc.Smoothsurfaces resulting from the use of plywood forms or a steeltrowel finish are not acceptable and must be given a coursesandpaper profile by blasting or mechanical scarifying.Thepreferred finish for new concrete floors after leveling is a woodfloat finish,followed by a single pass metal trowel finish.Thecontour of the finished surface must be free of ridges anddepressions,cracks,or open joints.When an old concretesurface is to be removed,it shall be cut out to provide thenecessary thickness for the new setting bed and the construc-tion unit.The surface must be clean,free of loose particles,hard,and roughened to ensure intimate bond with the new bedjoint.The edges around all cut-out sections shall be maintainedstraight and vertical.A final finishing of the edges by handchiseling may be necessary.4.2 Acleavage membrane consisting of waterproof buildingfelt as specified in Specifications D226 and D227,or polyeth-ylene sheeting 0.004 in.(0.10 mm)thick is generally used overwood frame construction and is preferred for many other typesof construction.It may be omitted over certain types ofconcrete bases of limited areas.Cleavage membrane shall haveedges overlapped a nominal 2-in.4.3 CleaningAll dirt,dust,loose particles,surfacelaitance,and debris shall be removed from the concrete fill orsubbase by vigorous brooming,vacuuming,or other means.The surface must be free of grease,oil,or wax deposits.4.4 Screed StripsWood or metal strips shall be used togage the thickness of the setting bed.4.5 Thickness of Setting BedThe setting bed shall be 1 to112in.(25 to 38 mm)thick.4.6 Wetting Concrete Fill or SubbaseSeveral hours beforeplacing the setting bed,the prepared concrete surface shall bethoroughly saturated with clean water.About 1 h before1This practice is under the jurisdiction of ASTM Committee C03 on Chemical-Resistant Nonmetallic Materialsand is the direct responsibility of SubcommitteeC03.02 on Monolithics,Grouts and Polymer Concretes.Current edition approved Aug.1,2012.Published September 2012.Originallyapproved in 1957.Last previous edition approved in 2008 as C398 98(2008).DOI:10.1520/C0398-98R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 placing the topping,all surface water shall be removed with amop or by other means.NOTE1The procedure described in this paragraph does not apply tofloors installed over a cleavage membrane.4.7 Expansion JointsWhen required,the expansion jointstrips shall be located and set in position.If the expansionjoints are not of the preset type,removable strips shall be set soas to keep t