ASTM_C_1798_-_C_1798M_-_16e1.pdf

Designation:C1798/C1798M161Standard 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 revision,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.1NOTEThe designation was editorially corrected to match the units of measurement statement in October 2016.1.Scope1.1 This specification covers returned fresh concrete for usein a new batch of ready-mixed concrete.Requirements 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,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 reference 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 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 be 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 and health practices and determine the applica-bility of regulatory limitations prior to use.(WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged use.2)2.Referenced Documents2.1 ASTM Standards:3C94/C94M Specification for Ready-Mixed ConcreteC125 Terminology Relating 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 Specific to This Standard:3.2.1 admixture,hydration stabilizing,nset-retardingadmixture,conforming to Specification C494/C494M Type Bor D,that can predictably reduce the hydration rate of cementfor applications requiring the management of time of setting ofreturned concrete,reducing the hydration rate of cement finesin water from concrete production,or for applications requiringextended delivery time of ready-mixed concrete.3.2.2 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 purchaser.NOTE2The requirements of this specification are in addition to thoseof the purchaser and the specification of the new batch of concretecontaining returned fresh concrete.1This 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 March 15,2016.Published April 2016.DOI:10.1520/C1798_C1798M16E01.2See 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,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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE3If using Specification C94/C94M for concrete potentiallyincorporating returned fresh concrete,it is recommended the purchaserselect Option A.In this option,the manufacturer has responsibility formaking necessary adjustments to mixture proportions to ensure the newconcrete batch containing returned fresh concrete will meet the require-ments of the purchaser.4.2 At the request of the purchaser,the manufacturer shallfurnish information on procedures used to reuse returned freshconcrete.5.Measuring Materials5.1 The amount of returned fresh concrete shall be deter-mined by mass or volume with equipment capab