1、Designation:C131/C131M14Standard Test Method forResistance to Degradation of Small-Size Coarse Aggregateby Abrasion and Impact in the Los Angeles Machine1This standard is issued under the fixed designation C131/C131M;the number immediately following the designation indicates the yearof original adop
2、tion or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript 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.1.Sc
3、ope*1.1 This test method covers a procedure for testing of coarseaggregates with a maximum size smaller than 37.5 mm(112in.for resistance to degradation using the Los Angeles testingmachine(Note 1).NOTE1A procedure for testing coarse aggregate larger than 19.0 mm34in.is covered in Test Method C535.T
4、hus coarse aggregates with amaximum size between 19 mm 34in.and 37.5 mm 112in.may betested by Test Method C535 or Test Method C131/C131M.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;
5、therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.NOTE2Sieve size is identified by its standard designation in Speci-fication E11.The Alternative designation given in parentheses is forinformation only an
6、d does not represent a different standard sieve size.1.3 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 r
7、egulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingC125 Terminology Relating to Concrete and Concrete Ag-gregatesC136 Test Method for Sieve Analysis of Fine and Coars
8、eAggregatesC535 Test Method for Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in the LosAngeles MachineC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC702 Practice for Reducing Samples ofAggregate to TestingSizeD7
9、5 Practice for Sampling AggregatesE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology C125.4.Summary of Test Method4.1 This test is a measure of degradation of mineral aggre-gates of standar
10、d gradings resulting from a combination ofactions including abrasion or attrition,impact,and grinding ina rotating steel drum containing a specified number of steelspheres,the number depending upon the grading of the testsample.As the drum rotates,a shelf plate picks up the sampleand the steel spher
11、es,carrying them around until they aredropped to the opposite side of the drum,creating an impact-crushing effect.The contents then roll within the drum with anabrading and grinding action until the shelf plate picks up thesample and the steel spheres,and the cycle is repeated.Afterthe prescribed nu
12、mber of revolutions,the contents are removedfrom the drum and the aggregate portion is sieved to measurethe degradation as percent loss.5.Significance and Use5.1 This test has been widely used as an indicator of therelative quality or competence of various sources of aggregatehaving similar mineral
13、compositions.The results do notautomatically permit valid comparisons to be made betweensources distinctly different in origin,composition,or structure.Assign specification limits with extreme care in considerationof available aggregate types and their performance history in1This test method is unde
14、r the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.20 on Normal Weight Aggregates.Current edition approved July 1,2014.Published July 2014.Originally approvedin 1937.Last previous edition approved in 2006 as C131 06.DOI:10.
15、1520/C0131_C0131M-14.2For 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.*A Summary of Changes section appears at the
16、end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 specific end uses.The percent loss determined by this testmethod has no known consistent relationship to the percentloss for the same material when tested by Test Method C535.6.Apparatus6.1 Los Angeles MachineA Los Angles machine,con-forming in all essential characteristics to the design shown inFig.1,shall be used.The machine shall consist of a hollowsteel cylinder,w
