1、Designation:C331/C331M17Standard Specification forLightweight Aggregates for Concrete Masonry Units1This standard is issued under the fixed designation C331/C331M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revis
2、ion.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers lightweight aggregates in-tended for use in concrete masonry units when a primeconsideration is to reduce
3、 the density of the units.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 used independently of the other.Combiningvalues from the two systems may result i
4、n non-conformancewith the standard.Some values have only SI units because theinch-pound equivalents are not used in practice.NOTE1Sieve size is identified by its standard designation in Speci-fication E11.The alternative designation given in parentheses is forinformation only and does not represent
5、a different standard sieve size.1.3 The text of this specification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the standard.1.4 This international standard was developed in a
6、ccor-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 Trade(TBT)Committee.2.Referenced Documents2.1 ASTM
7、 Standards:2C29/C29M Test Method for Bulk Density(“Unit Weight”)and Voids in AggregateC40 Test Method for Organic Impurities in Fine Aggregatesfor ConcreteC114 Test Methods for Chemical Analysis of HydraulicCementC125 Terminology Relating to Concrete and Concrete Ag-gregatesC136 Test Method for Siev
8、e Analysis of Fine and CoarseAggregatesC142 Test Method for Clay Lumps and Friable Particles inAggregatesC151 Test Method for Autoclave Expansion of HydraulicCementC157/C157M Test Method for Length Change of HardenedHydraulic-Cement Mortar and ConcreteC641 Test Method for Iron Staining Materials in
9、Light-weight Concrete AggregatesC702 Practice for Reducing Samples ofAggregate to TestingSizeC1262 Test Method for Evaluating the Freeze-Thaw Dura-bility of Dry-Cast Segmental Retaining Wall Units andRelated Concrete UnitsD75 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Siev
10、e Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification,referto Terminology C125.4.Aggregate Types4.1 Three general types of lightweight aggregates are cov-ered by this specification,as follows:4.1.1 Aggregates prepared by expanding,pelletizing,or
11、sintering products such as blast-furnace slag,clay,diatomite,fly ash,shale,or slate,and4.1.2 Aggregates prepared by processing natural materials,such as pumice,scoria,or tuff,and4.1.3 Aggregates consisting of end products of coal or cokecombustion.4.2 The aggregates shall be composed predominately o
12、flightweight-cellular and granular inorganic material.5.Chemical Composition5.1 Lightweight aggregates shall not contain excessiveamounts of deleterious substances,as determined by thefollowing limits:1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggrega
13、tes and is the direct responsibility of SubcommitteeC09.21 on Lightweight Aggregates and Concrete.Current edition approved June 15,2017.Published July 2017.Originallyapproved in 1953.Last previous edition approved in 2014 as C331/C331M 14.DOI:10.1520/C0331_C0331M-17.2For referenced ASTM standards,vi
14、sit 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 B
15、arr Harbor Drive,PO 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 Recommend
16、ations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.1.1 Organic Impurities(Test Method C40)Lightweightaggregates subjected to the test for organic impurities thatproduce a color darker than the standard shall be rejected,unless it is demonstrated that the discoloration is due to smallquantities of materials not harmful to the concrete.5.1.2 Staining(Test Method C641)An aggregate produc-ing a stain index of 60 or higher shall be rejected when thedeposited s
