1、Designation:C142/C142M17American Association of StateHighway and Transportation Officials StandardAASHTO No.T112Standard Test Method forClay Lumps and Friable Particles in Aggregates1This standard is issued under the fixed designation C142/C142M;the number immediately following the designation indic
2、ates the yearof original adoption 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.1.Scope1.1 This test method covers the approximate determina
3、tionof clay lumps and friable particles in aggregates.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
4、the two systems may result in non-conformancewith the standard.NOTE1Sieve sizes openings are identified by their Specification E11designation with their alternative Specification E11 designation given inparentheses for information only.1.3 This standard does not purport to address all of thesafety c
5、oncerns,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.1.4 This international standard was developed in accor-dance with internationally
6、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 Standards:2C33/C33M Specificati
7、on for Concrete AggregatesC117 Test Method for Materials Finer than 75-m(No.200)Sieve in Mineral Aggregates by WashingC125 Terminology Relating to Concrete and Concrete Ag-gregatesC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hy
8、draulic CementsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology C125.4.Significance and Use4.1 This test method is of primary significance in determin-ing the acceptability of aggr
9、egate with respect to the require-ments of Specification C33/C33M.5.Apparatus5.1 BalanceAbalance or scale accurate to within 0.1%ofthe mass of the test sample at any point within the range of use.Balances shall conform to the accuracy of the applicablesections of Specification C1005.5.2 ContainersRu
10、st-resistant containers of a size andshape that will permit the spreading of the sample on thebottom in a thin layer.5.3 SievesSieves conforming to Specification E11.5.4 Drying OvenAn oven providing free circulation of airand capable of maintaining a temperature of 110 6 5 C 2306 10 F.6.Samples6.1 A
11、ggregate for this test method shall consist of thematerial remaining after completion of testing in accordancewith Test Method C117.To provide the quantities designated in6.3 and 6.4,it may be necessary to combine material frommore than one test by Test Method C117.6.2 Dry the aggregate to substanti
12、ally constant mass at atemperature of 110 6 5 C 230 6 10 F.6.3 Test samples of fine aggregate shall consist of theparticles coarser than a 1.18-mm(No.16)sieve and shall havea mass not less than 25 g.6.4 Separate the test samples of coarse aggregate intodifferent sizes,using the following sieves:4.75
13、-mm(No.4),1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.20 on Normal Weight Aggregates.Current edition approved March 15,2017.Published May 2017.Originallyapproved in 1938.Last previous edition
14、approved in 2010 as C142/C142M10.DOI:10.1520/C0142_C0142M-17.2For 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.Copyr
15、ight ASTM International,100 Barr 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 S
16、tandards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 9.5-mm(38-in.),19.0-mm(34-in.),and 37.5-mm(112-in.).Thetest sample shall have a mass not less than indicated in thefollowing table:Size of Particles Making UpTest SampleMass of Test Sample,min,g4.75 to 9.5-mm(No.4 to38-in.)10009.5 to 19.0-mm(38to34-in.)200019.0 to 37.5-mm(34to 112-in.)3000Over 37.5-mm(112-in.)50006.5 In the case of mixtures of fine and coarse aggregates,separate