ASTM_D_7508_-_D_7508M_-_20.pdf

Designation:D7508/D7508M20Standard 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,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 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 the two systems may result in non-conformancewith the standard.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 health practicesand determine the applicability of regulatory limitations priorto use.1.4 This international standard was developed in accor-dance with internationally 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:2C1116/C1116M Specification for Fiber-Reinforced ConcreteD123 Terminology Relating to TextilesD1577 Test Methods for Linear Density of Textile FibersD1776 Practice for Conditioning 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 Polyolefin Monofilaments2.2 Other Documents:ICC ES AC32 Acceptance Criteria for Concrete with Syn-thetic Fibers33.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 reinforcement,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 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 gradation 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 generic 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 weight of ethylene,propylene,orother olefin units(monomers),except amorphous(noncrystal-line)polyolefin.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 Feb.1,2020.Published February 2020.Originallyapproved in 2010.Last previous edition approved in 2015 as D7508/D7508M10(2015).DOI:10.1520/D7508_D7508M-20.2For 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.3Available from ICC Evaluation Services,http:/www.icc-es.org.Copyright 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 Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.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