1、Designation:D7655/D7655M12Standard Classification forSize of Aggregate Used as Ballast for Membrane RoofSystems1This standard is issued under the fixed designation D7655/D7655M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year
2、 of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This classification defines the aggregate size designa-tions and ranges in mechanical analyses for standard sizes ofagg
3、regate used as ballast for membrane roof systems.1.2 The text of this classification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the standard.1.3 With regard to sieve sizes a
4、nd the size of aggregate asdetermined by the use of testing sieves,the values in inch-pound units are shown for the convenience of the user;however,the standard sieve designations shown in parenthesesis the standard value as stated in Specification E11.1.4 The values stated in either SI units or inc
5、h-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 in non-conformancewith the standard.1.5 This standard does not purport to
6、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 regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C136 Test Meth
7、od for Sieve Analysis of Fine and CoarseAggregatesD75 Practice for Sampling AggregatesD1079 Terminology Relating to Roofing and WaterproofingE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 ANSI/SPRI Standard:3RP-4 Wind Design Standard for Ballasted Single-ply Roof-ing Systems3.Te
8、rminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to Terminology D1079.4.Significance and Use4.1 The wind resistance of ballasted membrane roof systemsis determined largely by the size and weight of the ballastedused.ANSI/SPRI RP-4 provides a method for the wind design
9、of ballasted single-ply membrane roof systems and includesspecific guidelines for the size and weight of aggregate used asballast.The aggregate size classifications provided in thisstandard are intended for use with the guidelines providedANSI/SPRI RP-4 in designing the wind resistance of aggregateb
10、allasted single-ply membrane roof systems.4.2 The aggregate size classifications provided in this clas-sification are intended to provide a basis of compliance forcontract documentsthat specify certain aggregate sizes for useon ballasted membrane systems.5.Manufacture5.1 The standard sizes of aggreg
11、ate described in this clas-sification are manufactured by means of any suitable processused to separate raw material into the desired size ranges.Production of standard sizes by blending two or more differentcomponents is permitted.6.Standard Sizes6.1 Standard sizes of aggregate shall comply with th
12、e sizesgiven in Table 1.All sizes shall be determined by means oflaboratory sieves having square openings and conforming toSpecification E11.1This classification is under the jurisdiction of ASTM Committee D08 onRoofing and Waterproofing and is the direct responsibility of Subcommittee D08.20on Roof
13、ing Membrane Systems.Current edition approved Jan.1,2012.Published January 2012.DOI:10.1520/D7655_D7655M-12.2For 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
14、 Document Summary page onthe ASTM website.3Available from SPRI,411 Waverley Oaks Road,Suite 331B,Waltham,MA02452.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Basis of Classification7.1 Classification is based upon the size number and
15、 sizeranges shown in Table 1 with the aggregate sampled inaccordance with Practice D75 and tested for grading by TestMethod C136.8.Keywords8.1 aggregate;aggregate standard size;screeningsASTM International takes no position respecting the validity of any patent rights asserted in connection with any
16、 item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be ad
