ASTM_C_1260_-_14.pdf

Designation:C126014Standard Test Method forPotential Alkali Reactivity of Aggregates(Mortar-BarMethod)1This standard is issued under the fixed designation C1260;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.1.Scope*1.1 This test method permits detection,within 16 days,ofthe potential for deleterious alkali-silica reaction of aggregatein mortar bars.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.When this test method refers to combined-unitstandards,the selection of the measurement systems is at theusers discretion.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.A specific precau-tionary statement is given in the section on Reagents.2.Referenced Documents2.1 ASTM Standards:2C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C125 Terminology Relating to Concrete and Concrete Ag-gregatesC127 Test Method for Density,Relative Density(SpecificGravity),and Absorption of Coarse AggregateC128 Test Method for Density,Relative Density(SpecificGravity),and Absorption of Fine AggregateC150/C150M Specification for Portland CementC151/C151M Test Method for Autoclave Expansion of Hy-draulic CementC295/C295M Guide for Petrographic Examination of Ag-gregates for ConcreteC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC490/C490M Practice for Use of Apparatus for the Deter-mination of Length Change of Hardened Cement Paste,Mortar,and ConcreteC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC856 Practice for Petrographic Examination of HardenedConcreteD1193 Specification for Reagent WaterE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 DefinitionsFor definitions of other terms relating toconcrete or aggregates,see Terminology C125.3.1.1 relative density(OD),nas defined in Test MethodsC127 or C128,for coarse and fine aggregates,respectively.4.Significance and Use4.1 This test method provides a means of detecting thepotential of an aggregate intended for use in concrete forundergoing alkali-silica reaction resulting in potentially delete-rious internal expansion.It is based on the NBRI AcceleratedTest Method(1-4).3It is especially useful for aggregates thatreact slowly or produce expansion late in the reaction.However,it does not evaluate combinations of aggregates withcementitious materials nor are the test conditions representa-tive of those encountered by concrete in service.4.2 Because the specimens are exposed to a NaOH solution,the alkali content of the cement is not a significant factor inaffecting expansions.4.3 When excessive expansions(see Appendix X1)areobserved,it is recommended that supplementary informationbe developed to confirm that the expansion is actually due to1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.26 on Chemical Reactions.Current edition approved Aug.1,2014.Published August 2014.Originallyapproved in 1989.Last previous edition approved in 2007 as C1260 07.DOI:10.1520/C1260-14.2For 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.3The boldface numbers in parentheses refer to a list of references at the end ofthe text.*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 alkali-silica reaction.Sources of such supplementary informa-tion include:(1)petrographic examination of the aggregate(Guide C295/C295M)to determine if known reactive constitu-ents are present;(2)examination of the specimens after tests(Practice C856)to identify the products of alkali reaction;and(3)where available,field service records can be used in theassessment of performance.4.4 When it has been concluded from the results of testsperformed using this test method and supplementary informa-tion that a given aggregate should be considered potentiallydeleteriously reactive,the use of mitigative measures such aslow-alkali portland cement,mineral admixtures,or groundgra