1、Designation:D75/D75M14American Association StateHighway and TransportationOfficials StandardAASHTO No.:T2Standard Practice forSampling Aggregates1This standard is issued under the fixed designation D75/D75M;the number immediately following the designation indicates the yearof original adoption or,in
2、 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 practice covers sampling of coarse and fine aggre-gates for the following purposes:
3、1.1.1 Preliminary investigation of the potential source ofsupply,1.1.2 Control of the product at the source of supply,1.1.3 Control of the operations at the site of use,and1.1.4 Acceptance or rejection of the materials.NOTE1Sampling plans and acceptance and control tests vary with thetype of constru
4、ction in which the material is used.1.2 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.3 The values stated in either SI units or inch-p
5、ound 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 in non-conformancewith the standard.1.4 This standard does not purport to add
6、ress 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.NOTE2The quality of the results produced by this standard a
7、redependent on the competence of the personnel performing the procedureand the capability,calibration,and maintenance of the equipment used.Agencies that meet the criteria of Practice D3666 are generally consideredcapable of competent and objective testing/sampling/inspection/etc.Usersof this standa
8、rd are cautioned that compliance with Practice D3666 alonedoes not completely assure reliable results.Reliable results depend onmany factors;following the suggestions of Practice D3666 or somesimilar acceptable guideline provides a means of evaluating and control-ling some of those factors.2.Referen
9、ced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Concrete Ag-gregatesC702 Practice for Reducing Samples ofAggregate to TestingSizeD8 Terminology Relating to Materials for Roads and Pave-mentsD2234/D2234M Practice for Collection of a Gross Sampleof CoalD3665 Practice for Ran
10、dom Sampling of Construction Ma-terialsD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsE105 Practice for Probability Sampling of MaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Charact
11、eristic of aLot or ProcessE141 Practice for Acceptance of Evidence Based on theResults of Probability Sampling3.Terminology3.1 Definitions:3.1.1 maximum size of aggregate,nin specifications for,or descriptions of aggregatethe smallest sieve openingthrough which the entire amount of aggregate is requ
12、ired topass.3.1.2 maximum aggregate size,(Superpave)nin specifi-cations for,or descriptions of aggregateone size larger thanthe nominal maximum aggregate size.3.1.3 nominal maximum aggregate size(of aggregate),nin specifications for,or descriptions of aggregatethesmallest sieve opening through which
13、 the entire amount of theaggregate is permitted to pass.3.1.4 nominal maximum aggregate size(Superpave),ninspecifications for,or descriptions of aggregateone size largerthan the first sieve that retains more than 10%aggregate.1This practice is under the jurisdiction of ASTM Committee D04 on Road and
14、Paving Materials and is the direct responsibility of Subcommittee D04.30 onMethods of Sampling.Current edition approved June 1,2014.Published June 2014.Originallyapproved in 1920.Last previous edition approved in 2009 as D75/D75M 09.DOI:10.1520/D0075_D0075M-14.2For referenced ASTM standards,visit th
15、e 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United Sta
16、tes1 3.1.4.1 DiscussionThe definitions in 3.1.1 and 3.1.2 alsoappear in Terminologies C125 and D8.They are presented inthis standard to illustrate the differences between the aggregatedefinitions and Superpave definitions of similar terms.Thedefinitions in 3.1.2 and 3.1.4 apply to hot mix asphalt(HMA)mixtures designed using the Superpave system only.3.1.4.2 DiscussionSpecifications on aggregates usuallystipulate a sieve opening through which all of the aggregatemay,but not need to,pass so that a