1、Designation:C1798/C1798M19Standard Specification forReturned Fresh Concrete for Use in a New Batch of Ready-Mixed Concrete1This standard is issued under the fixed designation C1798/C1798M;the number immediately following the designation indicates theyear of original adoption or,in the case of revisi
2、on,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers returned fresh concrete for usein a new batch of ready-mixed concrete.Requirement
3、s forreturned fresh concrete shall be either as hereinafter specifiedor as specified by the purchaser.In any case where therequirements of the purchaser differ from those in thisspecification,the purchasers requirements shall govern.Thisspecification does not cover the placement,consolidation,curing
4、,or protection of the concrete after delivery to thepurchaser.1.2 This specification by itself shall not grant permission tothe manufacturer to use returned fresh concrete in a new batchof concrete.NOTE1The permission to use returned fresh concrete may beaddressed in purchase documents,which may ref
5、erence this specification.1.3 Returned fresh concrete in a quantity of less than 450 kg1000 lb or 0.2 m30.25 yd3 shall not be subject to thisspecification.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be
6、exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the standard.1.5 The text of this standard references notes and footnotes,which provide explanatory information.These notes and foot-notes shall not b
7、e considered as requirements of the standard.1.6 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,health,and environmental practices and deter-mine the applicabilit
8、y of regulatory limitations prior to use.(WarningFresh hydraulic cementitious mixtures are causticand may cause chemical burns to skin and tissue uponprolonged use.2)1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establishe
9、d in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3C94/C94M Specification for Ready-Mixed ConcreteC125 Terminology Relating
10、 to Concrete and Concrete Ag-gregatesC494/C494M Specification for Chemical Admixtures forConcreteC1064/C1064M Test Method for Temperature of FreshlyMixed Hydraulic-Cement Concrete3.Terminology3.1 DefinitionsThe terms used in this specification aredefined in Terminology C125.3.2 Definitions of Terms
11、Specific to This Standard:3.2.1 concrete,returned fresh,nfresh concrete not yetdischarged from a ready-mixed concrete transportation unitwhen it is returned to the manufacturer.4.Ordering Information4.1 The new batch of concrete containing returned freshconcrete shall meet all requirements of the pu
12、rchaser.NOTE2The requirements of this specification are in addition to thoseof the purchaser and the specification of the new batch of concretecontaining returned fresh concrete.NOTE3If using Specification C94/C94M for concrete potentiallyincorporating returned fresh concrete,it is recommended the p
13、urchaserselect Option A.In this option,the manufacturer has responsibility for1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.40 on Ready-Mixed Concrete.Current edition approved Jan.1,2019.Publ
14、ished January 2019.Originallyapproved in 2016.Last previous edition approved in 2016 as C1798/C1798M161.DOI:10.1520/C1798_C1798M19.2See Section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol 04.02.3For referenced ASTM standards,visit the ASTM website
15、,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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO
16、Box C700,West Conshohocken,PA 19428-2959.United StatesThis international 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 making necessary adjustments to mixture proportions to ensure the newconcrete batch containing returned fresh concrete will meet t
