1、Designation:D7508/D7508M10(Reapproved 2015)An American National StandardStandard Specification forPolyolefin Chopped Strands for Use in Concrete1This standard is issued under the fixed designation D7508/D7508M;the number immediately following the designation indicates theyear of original adoption or
2、,in the case of revision,the year 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 specification covers polyolefin chopped strands(fibers)for use in concrete.1.2 Th
3、e 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 the two systems may result in non-conformancewith the standa
4、rd.1.3 The following safety hazards caveat pertains only to thetest methods described in this specification:This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and heal
5、th practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:2C1116/C1116M Specification for Fiber-Reinforced ConcreteD123 Terminology Relating to TextilesD1577 Test Methods for Linear Density of Textile FibersD1776 Practice for Condition
6、ing and Testing TextilesD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD2256 Test Method for Tensile Properties of Yarns by theSingle-Strand MethodD2257 Test Method for Extractable Matter in TextilesD2258 Practice for Sampling Yarn for TestingD3218 Specification for Pol
7、yolefin Monofilaments3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this Specification,refer to Terminology D123.3.2 Definitions of Terms Specific to This Standard:3.2.1 chopped strand,ncut staple polymer fiber of speci-fied lengths.3.2.2 fiber,nas used for concrete reinforcemen
8、t,choppedstrand that is mixed into concrete or mortar.3.2.2.1 DiscussionFiber used for concrete or mortar rein-forcement is available in various deniers.These include:(a)Macro polyolefin fiber which has linear density greaterthan or equal to 580 denier(equivalent diameter 0.3 mm).(b)Micro polyolefin
9、 fiber which has a linear density of lessthan 580 denier(equivalent diameter 0.3 mm).(c)Hybrid fiber which include a combination of macropolyolefin and micro polyolefin fibers.(d)Multi-length fibers which consist of chopped strands ofvarious lengths of fiber.(e)Graded fiber which consists of a grada
10、tion of multiplelength and multiple denier fibers.3.2.3 fiber reinforced concrete(FRC),nhydraulic cementconcrete that includes chopped strands(fibers).3.2.4 finish content,nthe percent by mass of finish extrac-tions on the fiber.3.2.5 high-tenacity fiber,na manufactured fiber that be-longs to a gene
11、ric class of fibers having exceptional breakingstrength;or having a breaking strength significantly greaterthan the average strength of other(regular tenacity)fibers inthe same generic class of equivalent linear densities.3.2.6 polyolefin,nany long-chain synthetic polymer com-posed of at least 85%by
12、 weight of ethylene,propylene,orother olefin units(monomers),except amorphous(noncrystal-line)polyolefin.3.2.7 reprocessed materials,nmaterials that have beenrecycled from another process.3.2.8 strand,na single fiber,filament,or monofilament.3.2.9 skein,na continuous strand of yarn,wound on ahand or
13、 motorized reel.3.2.10 yarn,nas used for fiber concrete reinforcement,narrow slit extruded film.1This specification is under the jurisdiction of ASTM Committee D13 onTextiles and is the direct responsibility of Subcommittee D13.58 on Yarns andFibers.Current edition approved July 1,2015.Published Sep
14、tember 2015.Originallyapproved in 2010.Last previous edition approved in 2010 as D7508/D7508M10.DOI:10.1520/D7508_D7508M-10R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,ref
15、er 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 States1 SPECIFICATIONS4.Chopped Strands for FRC4.1 Polyolefin chopped strands shall be manufactured andtested to specific targets and tol
16、erances as detailed in themanufactures product specifications.4.2 Materials shall be tested during processing(skeins oruncut strands)and after processing(chopped strands).5.Summary5.1 Summaries of the various testing procedures are in-cluded in the referenced test methods,or in pertinent sectionsof this specification.5.1.1 Denier:D1577 Test Method for Linear Density ofTextile FibersD1907 Linear Density of Yarn by Skein Method5.1.2 Tensile:D2256 Test Method for Tensile Properties ofYarns by the S
