ASTM_C_586_-_11.pdf

Designation:C58611Standard Test Method forPotential Alkali Reactivity of Carbonate Rocks as ConcreteAggregates(Rock-Cylinder Method)1This standard is issued under the fixed designation C586;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.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 determination of the expan-sion of a specimen of carbonate rock while immersed in asolution of sodium hydroxide(NaOH)at room temperature.The length changes occurring during such immersion indicatethe general level of reactivity of the rock and whether testsshould be made to determine the effect of aggregate preparedfrom the rock upon the volume change in concrete.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2C294 Descriptive Nomenclature for Constituents of Con-crete AggregatesC295 Guide for Petrographic Examination ofAggregates forConcreteC1105 Test Method for Length Change of Concrete Due toAlkali-Carbonate Rock ReactionD75 Practice for Sampling AggregatesD1248 Specification for Polyethylene Plastics ExtrusionMaterials for Wire and CableE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 For definitions of terms relating to aggregates used inthis test method,refer to Descriptive Nomenclature C294.4.Summary of Test Method4.1 Small rock cylinders are immersed in a solution ofNaOH except when removed for determination of lengthchange.The length change of each specimen is periodicallydetermined.5.Significance and Use5.1 This test method is intended to give a relatively rapidindication of the potential expansive reactivity of certaincarbonate rocks that may be used as concrete aggregates.Thetest method has been successfully used in(1)research and(2)preliminary screening of aggregate sources to indicate thepresence of material with a potential for deleterious expansionwhen used in concrete.5.2 The test method is intended as a research and screeningmethod rather than as the basis of a specification requirement.It is intended to supplement data from field service records,petrographic examinations according to Guide C295,and testsof aggregate in concrete according to Test Method C1105.5.3 Alkalies participating in the expansive reactions withaggregate constituents in concrete usually are derived from thehydraulic cement;under certain circumstances they may bederived from other constituents of concrete or from externalsources.Two types of alkali reactivity of aggregates arerecognized:(1)alkali-silica reaction involving certain siliceousrocks,minerals,and artificial glasses,and(2)alkali carbonatereaction involving dolomite in certain calcitic dolomites,do-lomitic limestones,and dolostones.This test method is notsuitable as a means to detect alkali-silica reaction.6.Apparatus and Reagents6.1 1 N Sodium Hydroxide SolutionDissolve 40 6 1 g ofreagent-grade sodium hydroxide(NaOH)in distilled water,dilute to 1 L and store in a polyethylene bottle.6.2 Sawing,Drilling,and Grinding Equipment,suitable forpreparing test specimens of the dimensions given in Section 8.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.26 on Chemical Reactions.Current edition approved Oct.1,2011.Published November 2011.Originallyapproved in 1966.Last previous edition approved in 2005 as C586 05.DOI:10.1520/C0586-11.2For 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.*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 This will require one or more rock saws,depending upon thesize of the original sample,a drill press equipped with a smalldiamond core barrel for removing the cylindrical core,and alap,grinder,or suitable modified lathe for shaping the ends ofthe specimens.6.3 Storage Bottles,approximately 50 to 100-mL capacitywith caps and openings of sufficient size to facilitate removalof specimens.The polyethylene bottle shall be selected toensure that the solution will not be modified by reaction withthe material composin