1、Designation:C53516Standard Test Method forResistance to Degradation of Large-Size Coarse Aggregateby Abrasion and Impact in the Los Angeles Machine1This standard is issued under the fixed designation C535;the number immediately following the designation indicates the year oforiginal adoption or,in t
2、he case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript 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.Scope*1.1 This
3、test method covers testing sizes of coarse aggregatelarger than 19 mm(34in.)for resistance to degradation usingthe Los Angeles testing machine(Note 1).NOTE1A procedure for testing coarse aggregate smaller than 37.5mm(112in.)is covered in Test Method C131/C131M.1.2 The values stated in SI units are t
4、o be regarded as thestandard.The inch-pound values given in parentheses are forinformation only.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 prac
5、tices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Concrete Ag-gregatesC131/C131M Test Method for Resistance to Degradation ofSmall-Size Coarse Aggregate by Abrasion and Impact inthe Los An
6、geles MachineC136/C136M Test Method for Sieve Analysis of Fine andCoarse AggregatesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC702/C702M Practice for Reducing Samples of Aggregateto Testing SizeD75/D75M Practice for Sampling AggregatesE11 Spec
7、ification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology C125.4.Summary of Test Method4.1 This test is a measure of degradation of mineral aggre-gates of standard gradings resulting from a combination ofactions inc
8、luding abrasion or attrition,impact,and grinding ina rotating steel drum containing 12 steel spheres.As the drumrotates,a shelf plate picks up the sample and the steel spheres,carrying them around until they are dropped to the oppositeside of the drum,creating an impact-crushing effect.Thecontents t
9、hen roll within the drum with an abrading andgrinding action until the shelf plate picks up the sample and thesteel spheres,and the cycle is repeated.After the prescribednumber of revolutions,the contents are removed from the drumand the aggregate portion is sieved to measure the degradationas perce
10、nt loss.5.Significance and Use5.1 The test has been widely used as an indicator of therelative quality or competence of various sources of aggregatehaving similar mineral compositions.The results do notautomatically permit valid comparisons to be made betweensources distinctly different in origin,co
11、mposition,or structure.Assign specification limits with extreme care in considerationof available aggregate types and their performance history inspecific end uses.6.Apparatus6.1 The Los Angeles Machine shall conform to the require-ments of Test Method C131/C131M.6.1.1 The operation and maintenance
12、of the machine shallbe as prescribed in Test Method C131/C131M.6.2 Sieves,conforming to Specification E11.6.3 BalanceA balance or scale accurate within 0.1%oftest load over the range required for this test6.4 ChargeThe charge(Note 2)shall consist of 12 steelspheres averaging approximately 47 mm(1273
13、2in.)in1This test method is under 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 June 15,2016.Published June 2016.Originallyapproved in 1964.Last previous edition ap
14、proved in 2012 as C535 12.DOI:10.1520/C0535-16.2For 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 Chang
15、es section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 diameter,each having a mass between 390 and 445 g,andhaving a total mass of 5000 6 25 g.NOTE2Steel ball bearings 46.0 mm(11316in.)and 47.6 mm(17
16、8in.)in diameter,having a mass approximately 400 and 440 g each,respectively,are readily available.Steel spheres 46.8 mm(12732in.)indiameter having a mass approximately 420 g may also be obtainable.Thecharge may consist of a mixture of these sizes conforming to the totalmass tolerance of 6.4.7.Sampling7.1 Obtain the field sample in accordance with PracticeD75/D75M and reduce to an adequate sample size in accor-dance with Practice C702/C702M.8.Test Sample Preparation8.1 Wash the reduced sample an
