1、Designation:C20718Standard Specification forHydrated Lime for Masonry Purposes1This standard is issued under the fixed designation C207;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
2、 indicates 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.1.Scope1.1 This specification covers four types of hydrated lime.Types N and S are sui
3、table for use in mortar,in scratch andbrown coats of cement plaster,for stucco,and for addition toportland-cement concrete.Types NA and SA are air-entrainedhydrated limes that are suitable for use in any of the above useswhere the inherent properties of lime and air-entrainment aredesired.The four t
4、ypes of lime sold under this specificationshall be designated as follows:1.1.1 Type NNormal hydrated lime for masonry purposes.1.1.2 Type SSpecial hydrated lime for masonry purposes.1.1.3 Type NANormal air-entraining hydrated lime formasonry purposes.1.1.4 Type SASpecial air-entraining hydrated lime
5、 formasonry purposes.NOTE1Type S,special hydrated lime,and Type SA,special air-entraining hydrated lime,are differentiated from Type N,normal hydratedlime,and Type NA,normal air-entraining hydrated lime,principally bytheir ability to develop high,early plasticity and higher water retentivity,and by
6、a limitation on their unhydrated oxide content.NOTE2For normal(Type N)and special(Type S)finishing hydratedlime,refer to Specification C206.NOTE3Some building codes prohibit the use of air-entrainingmaterials in mortar,because of the accompanying reduction in bond andcompressive strength.Where incre
7、ased freeze-thaw resistance isimportant,air-entraining may be beneficial.Air-entraining lime should notbe used as a finishing lime.NOTE4For lime putty,refer to Specification C1489.1.2 The values stated in SI units are to be regarded asstandard.1.3 This standard does not purport to address all of the
8、safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance
9、 with internationally 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
10、:2C25 Test Methods for Chemical Analysis of Limestone,Quicklime,and Hydrated LimeC50/C50M Practice for Sampling,Sample Preparation,Packaging,and Marking of Lime and Limestone ProductsC110 Test Methods for Physical Testing of Quicklime,Hydrated Lime,and LimestoneC206 Specification for Finishing Hydra
11、ted LimeC226 Specification for Air-Entraining Additions for Use inthe Manufacture of Air-Entraining Hydraulic CementC778 Specification for Standard SandC1489 Specification for Lime Putty for Structural Purposes3.Terminology3.1 Definitions:3.1.1 standard mortar,na mortar containing only hydratedlime
12、and sand meeting the requirements of Specification C778.The mortar proportions are one part hydrated lime to threeparts of sand by volume as indicated in Table 4 of TestMethods C110.4.Additions4.1 Types NA and SA hydrated lime covered by thisspecification shall contain additives for the purpose of e
13、ntrain-ing air,and such additives shall conform to the requirements ofSpecification C226.5.Manufacturers Statement5.1 At the request of the purchaser,the manufacturer shallstate in writing the nature,amount,and identity of theair-entraining agent used and of any processing addition thatmay have been
14、 used,and also,if requested,shall supply test1This specification is under the jurisdiction of ASTM Committee C07 on Limeand Limestone and is the direct responsibility of Subcommittee C07.02 onSpecifications and Guidelines.Current edition approved Oct.1,2018.Published November 2018.Originallyapproved
15、 in 1946.Last previous edition approved in 2011 as C207 06(2011).DOI:10.1520/C0207-18.2For 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
16、 onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed 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 data showing compliance of such air-entraining addition
