ASTM D7508/D7508M-10

Standard Specification for Polyolefin Chopped Strands for Use in Concrete

ABSTRACT
This specification covers polyolefin chopped strands (fibers) for use in concrete. Tensile and tenacity properties are calculated by determining the breaking force, the breaking tenacity, and the elongation of adequately conditioned polyolefin filaments using Practice D1776. Conformance requirements for chopped strands for use in concrete include compliance with Specification C1116/C1116M, Type III as well as denier, finish content, tensile strength, and cut length.
SCOPE
1.1 This specification covers polyolefin chopped strands (fibers) for use in concrete.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 The following safety hazards caveat pertains only to the test methods described in this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-May-2010
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.58 - Yarns and Fibers

Relations

• Replaced By: ASTM D7508/D7508M-10(2015) - Standard Specification for Polyolefin Chopped Strands for Use in Concrete
• Effective Date: 01-Jul-2015
• Referred By: ASTM C1116/C1116M-23 - Standard Specification for Fiber-Reinforced Concrete
• Effective Date: 01-Jun-2010
• Referred By: ASTM C1818-22 - Standard Specification for Synthetic Fiber Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe
• Effective Date: 01-Jun-2010
• Referred By: ASTM C1932-23 - Standard Specification for Manufacture of Reinforced Precast Concrete End Sections for Pipe
• Effective Date: 01-Jun-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D7508/D7508M −10 AnAmerican National Standard
Standard Specification for
Polyolefin Chopped Strands for Use in Concrete
This standard is issued under the fixed designation D7508/D7508M; the number immediately following the designation indicates the
year of 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. Scope 3.1.1 For definitions of terms used in this Specification,
refer to Terminology D123.
1.1 This specification covers polyolefin chopped strands
(fibers) for use in concrete. 3.2 Definitions of Terms Specific to This Standard:
3.2.1 chopped strand, n—cut staple polymer fiber of speci-
1.2 The values stated in either SI units or inch-pound units
fied lengths.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each 3.2.2 fiber, n—as used for concrete reinforcement, chopped
strand that is mixed into concrete or mortar.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance 3.2.2.1 Discussion—Fiber used for concrete or mortar rein-
with the standard. forcement is available in various deniers. These include:
(a) Macro polyolefin fiber which has linear density greater
1.3 The following safety hazards caveat pertains only to the
than or equal to 580 denier (equivalent diameter ≥ 0.3 mm).
test methods described in this specification: This standard does
(b) Micro polyolefin fiber which has a linear density of less
not purport to address all of the safety concerns, if any,
than 580 denier (equivalent diameter < 0.3 mm).
associated with its use. It is the responsibility of the user of this
(c) Hybrid fiber which include a combination of macro
standard to establish appropriate safety and health practices
polyolefin and micro polyolefin fibers.
and determine the applicability of regulatory limitations prior
(d) Multi-length fibers which consist of chopped strands of
to use.
various lengths of fiber.
2. Referenced Documents
(e) Graded fiber which consists of a gradation of multiple
length and multiple denier fibers.
2.1 ASTM Standards:
C1116/C1116M Specification for Fiber-Reinforced Concrete
3.2.3 fiber reinforced concrete (FRC), n—hydraulic cement
D123 Terminology Relating to Textiles
concrete that includes chopped strands (fibers).
D1577 Test Methods for Linear Density of Textile Fibers
3.2.4 finish content, n—the percent by mass of finish extrac-
D1776 Practice for Conditioning and Testing Textiles
tions on the fiber.
D1907 Test Method for Linear Density of Yarn (Yarn Num-
3.2.5 high-tenacity fiber, n—a manufactured fiber that be-
ber) by the Skein Method
longs to a generic class of fibers having exceptional breaking
D2256 Test Method for Tensile Properties of Yarns by the
strength; or having a breaking strength significantly greater
Single-Strand Method
than the average strength of other (regular tenacity) fibers in
D2257 Test Method for Extractable Matter in Textiles
the same generic class of equivalent linear densities.
D2258 Practice for Sampling Yarn for Testing
D3218 Specification for Polyolefin Monofilaments 3.2.6 polyolefin, n—any long-chain synthetic polymer com-
posed of at least 85 % by weight of ethylene, propylene, or
3. Terminology
other olefin units (monomers), except amorphous (noncrystal-
3.1 Definitions:
line) polyolefin.
3.2.7 reprocessed materials, n—materials that have been
This specification is under the jurisdiction of ASTM Committee D13 on
recycled from another process.
Textiles and is the direct responsibility of Subcommittee D13.58 on Yarns and
Fibers.
3.2.8 strand, n—a single fiber, filament, or monofilament.
Current edition approved June 1, 2010. Published July 2010. DOI: 10.1520/
3.2.9 skein, n—a continuous strand of yarn, wound on a
D7508_D7508M-10.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
hand or motorized reel.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3.2.10 yarn, n—as used for fiber concrete reinforcement,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. narrow slit extruded film.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7508/D7508M−10
SPECIFICATIONS to determine if there is a statistical bias between them, using
competent statistical assistance. As a minimum, use test
4. Chopped Strands for FRC
samples that are as homogeneous as possible, drawn from the
4.1 Polyolefin chopped strands shall be manufactured and material from which the disparate test results were obtained,
and randomly assigned in equal numbers to each laboratory for
tested to specific targets and tolerances as detailed in the
manufacture’s product specifications. testing. The test results from the two laboratories should be
compared using a statistical test for unpaired data, at a
4.2 Materials shall be tested during processing (skeins or
probability level chosen prior to the testing series. If a bias is
uncut strands) and after processing (chopped strands).
foundeitheritscausemustbefoundandcorrectedorfuturetest
resultsforthatmaterialmustbeadjustedinconsiderationofthe
5. Summary
known bias.
5.1 Summaries of the various testing procedures are in-
cluded in the referenced test methods, or in pertinent sections
7. Sampling and Number of Specimens
of this specification.
7.1 Take samples as directed in the applicable material
5.1.1 Denier:
D1577 Test Method for Linear Density of Textile Fibers specification, or as agreed upon by the purchaser and the
supplier. In the absence of an applicable material specification,
D1907 Linear Density of Yarn by Skein Method
5.1.2 Tensile: orotheragreement,takealotsampleandlaboratorysamplesas
D2256 Test Method for Tensile Properties of Yarns by the directed in Practices D2258 or D3218.
NOTE 1—An adequate specification or other agreement between the
Single-Strand Method
purchaserandthesupplierrequirestakingintoaccountvariabilitybetween
D3218 Specification for Polyolefin Monofilaments
shipping units, between packages, or ends within a shipping unit, and
5.1.3 Tenacity—The tensile stress expressed force per unit
betweenspecimensfromasinglepackagesoastoprovideasamplingplan
linear density of the unstrained specimen. (Sometimes ex-
with a meaningful producer’s risk, consumer’s risk, acceptable quality
pressed in grams per denier, or GPD.) level, and limiting quality level.
D2256 Test Method for Tensile Properties of Yarns by the
Single-Strand Method 8. Fiber Length and Permissible Variations
5.1.4 Elongation:
8.1 A representative fiber sample of an order quantity shall
D2256 Test Method for Tensile Properties of Yarns by the
be 30 fibers obtained from three grab samples by combining 10
Single-Strand Method
randomly selected fibers from each grab sample. If deemed
D3218 Specification for Polyolefin Monofilaments
necessary, the producer shall choose to select the 10 specimens
5.1.5 Initial Modulus:
at different set intervals in order to obtain a more accurate
D2256 Test Method for Tensile Properties of Yarns by the
representationoftheproductionlot.Fiberlengthorlengths,for
Single-Strand Method
a given order quantity, shall be determined as the average
D3218 Specification for Polyolefin Monofilaments
length of the 30 fibers to the nearest mm.
5.1.6 Equivalent Diameter—The diameter of a circle having
8.2 Average fiber length, shall be within +10 % and –10 %
the same cross-sectional area as the fiber or strand. The
of the specified length.
measurement may be derived from stated calculation provided
in Eq 1.
8.3 Fiber products that are defined by a range of lengths or
5.1.7 Finish Content—Based on percent of total mass.
gradedlengths,shallhave95 %ofmeasuredlengthsfallwithin
Several methods of finish extractions are recognized including
the specified range.
the use of a NMR system (Nuclear Magnetic Residence),
8.4 Report:
Rapid Oil ExtractionApparatus, and spin finish analysis based
8.4.1 Fiber length to nearest mm.
on Test Method D2257. None of these systems or this standard
8.4.2 For hybrids and multi-length fibers, range of equiva-
addresses the chemical properties or types of chemicals that
lent diameters, linear densities, and fiber lengths as appropri-
may be contained in the finish applied. Certain chemicals at
ate.
variousdosagesmaycausechangeinthepropertiesofconcrete
mix performance such as air gain.
9. Linear Density, Cross Sectional Area, Equivalent
5.1.8 Fiber Length—Total distance from the outer ends of
Diameter of FRC Strand and Finish Content
the finished fiber or developed length.
9.1 Linear Density of FRC Chopped Strand:
6. Significance and Use
9.1.1 Apparatu
...