1、Designation:C61819Standard Specification forCoal Fly Ash and Raw or Calcined Natural Pozzolan for Usein Concrete1This standard is issued under the fixed designation C618;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t 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 specification covers coal fly ash a
3、nd raw orcalcined natural pozzolan for use in concrete where cementi-tious or pozzolanic action,or both,is desired,or where otherproperties normally attributed to fly ash or pozzolans may bedesired,or where both objectives are to be achieved.NOTE1Finely divided materials may tend to reduce the entra
4、ined aircontent of concrete.Hence,if a fly ash or natural pozzolan is added to anyconcrete for which entrainment of air is specified,provision should bemade to ensure that the specified air content is maintained by air contenttests and by use of additional air-entraining admixture or use of anair-en
5、training admixture in combination with air-entraining hydrauliccement.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The text of this standard references notes and footnotes,which provide explanatory information.These no
6、tes and foot-notes(excluding those in tables and figures)shall not beconsidered as requirements of the standard.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of
7、International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Concrete Ag-gregatesC311/C311M Test Methods for Sampling and Testing FlyAsh or Natur
8、al Pozzolans for Use in Portland-CementConcreteC1778 Guide for Reducing the Risk of Deleterious Alkali-Aggregate Reaction in Concrete3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification referto Terminology C125.4.Classification4.1 Class NRaw or calcined natural pozz
9、olans that com-ply with the applicable requirements for the class as givenherein,such as some diatomaceous earths;opaline cherts andshales;tuffs and volcanic ashes or pumicites,calcined oruncalcined;and various materials requiring calcination toinduce satisfactory properties,such as some clays and s
10、hales.4.2 Class FFly ash that meets the applicable requirementsfor this class as given herein.This class of fly ash haspozzolanic properties.4.3 Class CFly ash that meets the applicable requirementsfor this class as given herein.This class of fly ash,in additionto having pozzolanic properties,also h
11、as some cementitiousproperties.NOTE2Class F fly ash is typically produced from burning anthraciteor bituminous coal,but may also be produced from subbituminous coaland from lignite.Class C fly ash is typically produced from burning ligniteor subbituminous coal,and may also be produced from anthracit
12、e orbituminous coal.5.Ordering Information5.1 The purchaser shall specify any supplementary optionalphysical requirements.5.2 The purchaser shall indicate which procedure,A or B,shall be used when specifying requirements for effectiveness incontribution to sulfate resistance under Table 3.6.Chemical
13、 Composition6.1 Fly ash and natural pozzolans shall conform to therequirements as to chemical composition prescribed in Table 1.1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.24 on Supplementa
14、ry Cementitious Materials.Current edition approved Jan.1,2019.Published January 2019.Originallyapproved in 1968.Last previous edition approved in 2017 as C61817a.DOI:10.1520/C0618-19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org
15、.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 StatesThis inter
16、national 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 NOTE3The chemical component determinations and the limits placedon each do not predict the performance of the fly ash or natural pozzolanwith hydraulic cement in concrete,but collectively help d
