1、Designation:C27019a1Standard Specification forMortar for Unit Masonry1This standard is issued under the fixed designation C270;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 indicate
2、s the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1NOTEEditorially corrected 4.1.1.2 in July 2019.1.Scope*1.1 This specification covers mortars f
3、or use in the construc-tion of non-reinforced and reinforced unit masonry structures.Four types of mortar are covered in each of two alternativespecifications:(1)proportion specifications and(2)propertyspecifications.NOTE1When the property specification is used to qualify masonrymortars,the testing
4、agency performing the test methods should beevaluated in accordance with Practice C1093.1.2 The proportion or property specifications shall govern asspecified.1.3 When neither proportion or property specifications arespecified,the proportion specifications shall govern,unlessdata are presented to an
5、d accepted by the specifier to show thatmortar meets the requirements of the property specifications.1.4 This standard is not a specification to determine mortarstrengths through field testing(see Section 3).1.5 The text of this specification references notes andfootnotes which provide explanatory m
6、aterial.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the standard.1.6 The terms used in this specification are identified inTerminologies C1180 and C1232.1.7 The values stated in inch-pound units are to be regardedas standard.The values giv
7、en in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.8 The following safety hazards caveat pertains only to thetest methods section of this specification:This standard doesnot purport to address all of the safety concerns,i
8、f any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations prior to use.1.9 This international standard was developed in accor-dance with international
9、ly recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C5 Specification
10、for Quicklime for Structural PurposesC91/C91M Specification for Masonry CementC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C110 Test Methods for Physical Testing of Quicklime,Hydrated Lime,and LimestoneC128 Test Method for Relative Dens
11、ity(Specific Gravity)and Absorption of Fine AggregateC144 Specification for Aggregate for Masonry MortarC150/C150M Specification for Portland CementC188 Test Method for Density of Hydraulic CementC207 Specification for Hydrated Lime for Masonry Pur-posesC305 Practice for Mechanical Mixing of Hydraul
12、ic 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 ConcretesC595/C595M Specification for Blended Hydraulic CementsC780 Test Method for Preconstruction and ConstructionEva
13、luation of Mortars for Plain and Reinforced UnitMasonryC952 Test Method for Bond Strength of Mortar to Masonry1This specification is under the jurisdiction of ASTM Committee C12 onMortars and Grouts for Unit Masonryand is the direct responsibility of Subcom-mittee C12.03 on Specifications for Mortar
14、s.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 1951.Last previous edition approved in 2019 as C270 19.DOI:10.1520/C0270-19AE01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of AST
15、MStandards 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 StatesThis international standard was d
16、eveloped in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 Units(Withdrawn 2017)3C979/C979M Specification for Pigments for Integrally Col-ored ConcreteC1072 Test Methods for Measurement of Masonry FlexuralBond StrengthC1093 Practice for Accreditation of Testing Agencies forMa