1、Designation:C1761/C1761M17Standard Specification forLightweight Aggregate for Internal Curing of Concrete1This standard is issued under the fixed designation C1761/C1761M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of la
2、st 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 lightweight aggregate intendedto provide water for internal curing of concrete.It includes testmet
3、hods for determining the absorption and desorption prop-erties of lightweight aggregate.NOTE1Internal curing provides an additional source of water tosustain hydration and substantially reduce the early-age autogenousshrinkage and self-desiccation that can be significant contributors toearly-age cra
4、cking.Appendix X1 provides guidance on calculating thequantity of lightweight aggregate for internal curing.1.2 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
5、 used independently of the other.Combiningvalues from the two systems may result in non-conformance.Some values have only SI units because the inch-poundequivalents are not used in practice.NOTE2Sieve size is identified by its standard designation in Speci-fication E11.The alternative designation gi
6、ven in parentheses is forinformation only and does not represent a different standard sieve size.1.3 The text of this specification references notes andfootnotes that provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of
7、 the standard.1.4 This specification 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
8、.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to
9、 Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C29/C29M Test Method for Bulk Density(“Unit Weight”)and Voids in AggregateC40/C40M Test Method for Organic Impurities in FineAggregates for ConcreteC87/C87M Test Method for Effect of Organic Impurities inFine Aggregate on Strength of Mor
10、tarC114 Test Methods for Chemical Analysis of HydraulicCementC125 Terminology Relating to Concrete and Concrete Ag-gregatesC128 Test Method for Relative Density(Specific Gravity)and Absorption of Fine AggregateC136/C136M Test Method for Sieve Analysis of Fine andCoarse AggregatesC142/C142M Test Meth
11、od for Clay Lumps and FriableParticles in AggregatesC330/C330M Specification for Lightweight Aggregates forStructural ConcreteC641 Test Method for Iron Staining Materials in Light-weight Concrete AggregatesC702/C702M Practice for Reducing Samples of Aggregateto Testing SizeC1498 Test Method for Hygr
12、oscopic Sorption Isotherms ofBuilding MaterialsC1608 Test Method for Chemical Shrinkage of HydraulicCement PasteC1698 Test Method for Autogenous Strain of Cement Pasteand MortarD75/D75M Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 D
13、efinitions:3.1.1 For definitions of terms used in this practice,refer toTerminology C125.3.2 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.21 on
14、 Lightweight Aggregates and Concrete.Current edition approved June 15,2017.Published July 2017.Originallyapproved in 2012.Last previous edition approved in 2015 as C1761/C1761M 15.DOI:10.1520/C1761_C1761M-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer S
15、ervice 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 Box C700,West Conshohocken,PA 19428-295
16、9.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 3.2.1 absorption,A72,nof lightweight aggregate,the in-crease in mass of a specimen of oven-dry lightweight aggregatedue to water penetrating into the permeable pores of