1、Designation:C61815Standard 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.2.Referenced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Concrete Ag-gregatesC311 Test Methods for Sampling and Testing Fly Ash orNatural Pozzolans for Use in Po
7、rtland-Cement Concrete3.Terminology3.1 Definitions:3.1.1 The terms used in this specification are defined inTerminology C125.3.1.2 fly ashthe finely divided residue that results from theprocess of combustion of ground or powdered coal and that istransported by flue gasses.NOTE2This definition of fly
8、 ash does not include,among otherthings,the residue resulting from:(1)fluidized bed combustion ash,(2)the burning of municipal solid waste or any other refuse with coal,or(3)the burning of industrial or municipal solid waste in incinerators com-monly known as“incinerator ash.”4.Classification4.1 Cla
9、ss NRaw or calcined natural pozzolans 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 pro
10、perties,such as some clays and shales.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 hav
11、ing pozzolanic properties,also has some cementitiousproperties.NOTE3Class 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
12、 also be produced from anthracite orbituminous coal.Class C fly ashes typically have total calcium contents,expressed as calcium oxide(CaO),that are higher than Class F fly ashes.5.Ordering Information5.1 The purchaser shall specify any supplementary optionalphysical requirements.5.2 The purchaser s
13、hall indicate which procedure,A or B,shall be used when specifying requirements for effectiveness incontribution to sulfate resistance under Table 3.6.Chemical Composition6.1 Fly ash and natural pozzolans shall conform to therequirements as to chemical composition prescribed in Table 1.NOTE4The chem
14、ical component determinations and the limits placed1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.24 on Supplementary Cementitious Materials.Current edition approved Aug.1,2015.Published Septem
15、ber 2015.Originallyapproved in 1968.Last previous edition approved in 2012 as C61812a.DOI:10.1520/C0618-15.2For 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
16、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 on each do not predict the performance of the fly ash or natural pozzolanwith hydraulic cement in concrete,but collectively help describe compo-sition and uniformity of the material.7.Physical Properties7.1 Fly ash and natural pozzolans shall conform to thephysical requirements presc
