1、Designation:C47815aStandard Specification forCircular Precast Reinforced Concrete Manhole Sections1This standard is issued under the fixed designation C478;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A n
2、umber 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.PART IGENERAL1.Scope1.1 This specification covers the manufacture
3、and purchaserequirements of products used for the assembly and construc-tion of circular vertical precast reinforced concrete manholesand structures used in sewer,drainage,and water works.1.2 Part I,Sections 1 11,of this specification presentsgeneral requirements and requirements that are common toe
4、ach precast concrete product covered by this specification.1.3 Part II of this specification presents specific require-ments for each manhole product in the following sections:ProductSectionGrade Rings12Flat Slab Tops13Risers and Conical Tops14Base Sections15Steps and Ladders16NOTE1Future products w
5、ill to be included in Part II in a futurerevision of this specification.1.4 This specification is the inch-pound companion toSpecification C478M;therefore,no SI equivalents are pre-sented in the specification.NOTE2This specification is a manufacturing and purchase specifica-tion only and does not in
6、clude requirements for backfill,or the relation-ship between field load conditions and the strength requirements of themanhole products and appurtenances.Experience has shown,however,that the successful performance of this product depends upon the properselection of the product strength,type of foun
7、dation and backfill,and carein the field installation of the manhole products and connecting pipes.Theowner of the project for which these products are specified herein iscautioned to require inspection at the construction site.2.Referenced Documents2.1 ASTM Standards:2A615/A615M Specification for D
8、eformed and Plain Carbon-Steel Bars for Concrete ReinforcementA706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete ReinforcementA1064/A1064M Specification for Carbon-Steel Wire andWelded Wire Reinforcement,Plain and Deformed,forConcreteC33/C33M Specification for Concrete
9、 AggregatesC39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC150/C150M Specification for Portland CementC260/C260M Specification for Air-Entraining Admixturesfor ConcreteC309 Specification for Liquid Membrane-Forming Com-pounds for Curing ConcreteC494/C494M Specificati
10、on for Chemical Admixtures forConcreteC497 Test Methods for Concrete Pipe,Manhole Sections,orTileC595/C595M Specification for Blended Hydraulic CementsC618 Specification for Coal Fly Ash and Raw or CalcinedNatural Pozzolan for Use in ConcreteC822 Terminology Relating to Concrete Pipe and RelatedProd
11、uctsC989/C989M Specification for Slag Cement for Use inConcrete and MortarsC1017/C1017M Specification for Chemical Admixtures forUse in Producing Flowing ConcreteC1116/C1116M Specification for Fiber-Reinforced ConcreteC1602/C1602M Specification for Mixing Water Used in theProduction of Hydraulic Cem
12、ent Concrete2.2 ACI Standard:3318 Building Code,Requirements for Reinforced Concrete1This specification is under the jurisdiction of ASTM Committee C13 onConcrete Pipe and is the direct responsibility of Subcommittee C13.06 on Manholesand Specials.Current edition approved Oct.15,2015.Published Novem
13、ber 2015.Originallyapproved in 1961.Last previous edition approved in 2015 as C478 15.DOI:10.1520/C0478-15A.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
14、 Document Summary page onthe ASTM website.3Available from American Concrete Institute(ACI),P.O.Box 9094,FarmingtonHills,MI 48333-9094,http:/www.aci-int.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 DefinitionsFor de
15、finitions of terms relating to precastreinforced concrete manholes,see Terminology C822.4.Materials and Manufacture4.1 General material requirements for precast reinforcedconcrete manhole products are presented in 4.1.1 4.1.9.Othermaterials or additional requirements for a product,if any,arecovered
16、in the Part II section for that specific product.4.1.1 Reinforced ConcreteReinforced concrete shall con-sist of cementitious materials,mineral aggregates,admixtures,if used,and water,in which steel reinforcement has beenembedded in such a manner so that the steel reinforcement andconcrete act together.4.1.2 Cementitious Materials:4.1.2.1 CementCement shall conform to the requirementsfor portland cement of Specification C150/C150M,or shall beportland blast-furnace slag cement,portland-limestone c
