1、Designation:C20706(Reapproved 2011)Standard 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 numb
2、er in parentheses 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 Department of Defense.1.Scope1.1 This specification covers four types of hydrated lime.Types N
3、and S are suitable 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 aredesir
4、ed.The four types 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
5、hydrated lime 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 retent
6、ivity,and by 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 strengt
7、h.Where increased 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 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It i
8、s theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applicabil-ity of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C25 Test Methods for Chemical Analysis of Limestone,Quicklime,and Hydrated LimeC50
9、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 Hydrated LimeC226 Specification for Air-Entraining Additions for Use inthe Manufacture of Air-E
10、ntraining Hydraulic CementC778 Specification for SandC1489 Specification for Lime Putty for Structural Purposes3.Terminology3.1 Definitions:3.1.1 standard mortar,na mortar containing only hydratedlime and sand meeting the requirements of Specification C778.The mortar proportions are one part hydrate
11、d 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 entrain-ing air,and such additives shall conform to the requirements ofSpecification C226.5.Manufact
12、urers 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 used,and also,if requested,shall supply test1This specification is under the jurisdiction of ASTM
13、Committee C07 on Limeand is the direct responsibility of Subcommittee C07.02 on Specifications andGuidelines.Current edition approved June 1,2011.Published July 2011.Originally approvedin 1946.Last previous edition approved in 2006 as C207 06.DOI:10.1520/C0207-06R11.2For referenced ASTM standards,vi
14、sit 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.Unit
15、ed States1 data showing compliance of such air-entraining addition withthe provisions of Specification C226.6.Chemical Composition6.1 Hydrated lime for masonry purposes shall conform tothe following requirements as to chemical composition:Hydrate Types:NNASSACalcium and magnesium oxides(nonvolatile
16、basis),min,%95959595Carbon dioxide(as-receivedbasis),max,%:If sample is taken at place ofmanufacture5555If sample is taken at any otherplace7777Unhydrated oxides(as-receivedbasis),max,%887.Residue,Popping,and Pitting7.1 The four types of hydrated lime for masonry purposesshall conform to one of the following requirements:7.1.1 The residue retained on a No.30(600-m)sieve shallnot be more than 0.5%,or7.1.2 If the residue retained on a No.30(600-m)sieve isover 0.5%,the lime shall show no pops or pi