1、Designation:C478M15aStandard Specification forCircular Precast Reinforced Concrete Manhole Sections(Metric)1This standard is issued under the fixed designation C478M;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last re
2、vision.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.PART IGENERAL1.Scope1.1 This specification covers the ma
3、nufacture 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 which are
4、 common toeach 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
5、 products will be included in Part II in a future revisionof this specification.1.4 This specification is the SI companion to C478.NOTE2This specification is a manufacturing and purchase specifica-tion only,and does not include requirements for backfill,or the relation-ship between field load condit
6、ions 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 foundation and backfill,and carein the field installation of the manhole products
7、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 Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementA706/A706M Speci
8、fication 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 AggregatesC39/C39M Test Method for Compressive Strength of Cylin-drical Concr
9、ete SpecimensC150/C150M Specification for Portland CementC260/C260M Specification for Air-Entraining Admixturesfor ConcreteC309 Specification for Liquid Membrane-Forming Com-pounds for Curing ConcreteC494/C494M Specification for Chemical Admixtures forConcreteC497M Test Methods for Concrete Pipe,Man
10、hole Sections,or Tile(Metric)C595/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 RelatedProductsC989/C989M Specification for Slag Cement for Use inConcrete and
11、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 Cement Concrete2.2 ACI Standard:ACI 318 Building Code,Requirements for
12、Reinforced Con-crete33.Terminology3.1 DefinitionsFor definitions of terms relating to concretepipe,see Terminology C822.1This 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
13、approved Oct.15,2015.Published November 2015.Originallyapproved in 1980.Last previous edition approved in 2015 as C478M 15.DOI:10.1520/C0478M-15A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards vol
14、ume information,refer to the standards 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 Stat
15、es1 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 in the Part II section for that specific product.4.1.1 Reinforced ConcreteReinforced
16、 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 cement,or portland-pozzolan cement conforming to the requirementsof Specification C59
