1、Designation:C22710Standard Test Method forPotential Alkali Reactivity of Cement-AggregateCombinations(Mortar-Bar Method)1This standard is issued under the fixed designation C227;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the yea
2、r 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the dete
3、rmination of the sus-ceptibility of cement-aggregate combinations to expansivereactions involving hydroxyl ions associated with the alkalies(sodium and potassium)by measurement of the increase(ordecrease)in length of mortar bars containing the combinationduring storage under prescribed conditions of
4、 test.1.2 Alkalies participating in the expansive reactions usuallyare derived from the cement;under some circumstances theymay be derived from other constituents of the concrete or fromexternal sources.Two types of alkali reactivity of aggregatesare recognized:(1)an alkali-silica reaction involving
5、 certainsiliceous rocks,minerals,and natural or artificial glasses and(2)an alkali-carbonate reaction involving dolomite in certaincalcitic dolomites and dolomitic limestones(see DescriptiveNomenclature C294).The method is not recommended as ameans to detect the latter reaction because expansions pr
6、o-duced in the mortar-bar test by the alkali-carbonate reaction(see Test Method C586)are generally much less than thoseproduced by the alkali-silica reaction for combinations havingequally harmful effects in service.1.3 The values stated in SI units are to be regarded asstandard.When combined standa
7、rds are cited,the selection ofmeasurement system is at the users discretion subject to therequirements of the referenced standard.1.4 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 a
8、ppro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C33 Specification for Concrete AggregatesC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecim
9、ens)C289 Test Method for Potential Alkali-Silica Reactivity ofAggregates(Chemical Method)C294 Descriptive Nomenclature for Constituents of Con-crete AggregatesC295 Guide for Petrographic Examination ofAggregates forConcreteC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of
10、Plastic ConsistencyC441 Test Method for Effectiveness of Pozzolans or GroundBlast-Furnace Slag in Preventing Excessive Expansion ofConcrete Due to the Alkali-Silica ReactionC490 Practice for Use ofApparatus for the Determination ofLength Change of Hardened Cement Paste,Mortar,andConcreteC511 Specifi
11、cation for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC586 Test Method for PotentialAlkali Reactivity of Carbon-ate Rocks as Concrete Aggregates(Rock-CylinderMethod)C856 Practice for Petrographic Examination of HardenedConcret
12、eC1437 Test Method for Flow of Hydraulic Cement MortarE11 Specification for Woven Wire Test Sieve Cloth and TestSieves1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.26 on Chemical Reactions.Curre
13、nt edition approved Feb.1,2010.Published March 2010.Originallyapproved in 1950.Last previous edition approved in 2003 as C22703.DOI:10.1520/C0227-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards
14、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 3.Significance and Use3.1 Data correlating
15、 the results of tests performed using thistest method with performance of cement-aggregate combina-tions in concrete in service,results of petrographic examinationof aggregates(Guide C295),and results of tests for potentialreactivity of aggregates by chemical methods have beenpublished in Test Metho
16、d C289 and should be consulted inconnection with the use of results of tests performed using thistest method as the basis for conclusions and recommendationsconcerning the use of cement-aggregate combinations in con-crete.3.2 The results of tests performed using this method furnishinformation on the likelihood that a cement-aggregate combi-nation is potentially capable of harmful alkali-silica reactivitywith consequent deleterious expansion of concrete.Criteria todetermine potential deleterious
