ASTM A820/A820M-11

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Designation: A820/A820M −11
StandardSpecification for
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Steel Fibers for Fiber-Reinforced Concrete
This standard is issued under the fixed designationA820/A820M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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1. Scope* 2.2 ASTM Standards:
A370Test Methods and Definitions for Mechanical Testing
1.1 This specification covers minimum requirements for
of Steel Products
steel fibers intended for use in fiber-reinforced concrete. Five
A700Practices for Packaging, Marking, and Loading Meth-
types of steel fibers for this purpose are defined as pieces of
ods for Steel Products for Shipment
smooth or deformed cold-drawn wire; smooth or deformed cut
C1116/C1116MSpecification for Fiber-Reinforced Concrete
sheet; melt-extracted fibers; mill-cut or modified cold-drawn
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2.3 ACI Documents:
wire steel fibers that are sufficiently small to be dispersed at
ACI 506.1Guide to Fiber-Reinforced Shotcrete
random in a concrete mixture.
ACI 544.1RCommittee Report on Fiber-Reinforced Con-
crete
1.2 This specification provides for measurement of
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2.4 U.S. Federal Standards:
dimensions, tolerances from specified dimensions, and re-
Fed. Std. No. 123Marking for Shipment (Civil Agencies)
quired minimum physical properties, and prescribes testing
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procedures to establish conformance to these requirements. 2.5 U.S. Military Standards:
MIL-STD-129Marking for Shipment and Storage
1.3 In the case of conflict between a requirement of a
product specification and a requirement of this specification,
3. Terminology
the product specification shall prevail. In the case of a conflict
3.1 Definitions of Terms Specific to This Standard:
between a requirement of the product specification or a
3.1.1 deformed fiber, n—a fiber that is bent, flattened, or
requirement of this specification and a more stringent require-
roughenedtoimprovemechanicalbondtotheconcretematrix.
ment of the purchase order, the purchase order shall prevail.
3.1.2 modified fiber, n—a cold-drawn wire fiber whose
The purchase order requirements shall not take precedence if
cross-section has been changed from circular by shaving the
they, in any way, violate the requirements of the product
wire.
specification or this specification; for example, by the waiving
of a test requirement or by making a test requirement less 3.1.3 nominal length, n—the length of a deformed fiber,
stringent. out-to-out, after being deformed.
3.1.4 range of equivalent diameter, d ,n—a set of limits
1.4 The values stated in either SI units or inch-pound units e-r
placed on the equivalent diameter by the specifier. See 8.1.6
are to be regarded separately as standard. The values stated in
and Note 3.
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
3.2 Symbols—The following symbols used in this specifi-
values from the two systems may result in non-conformance cation are defined as follows:
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with the standard.
A=cross-sectional area, in. [mm ]
d=diameter, in. [mm]
2. Referenced Documents f =ultimate tensile strength, psi [MPa]
u
l=length, in. [mm]
2.1 The following documents, of the issue in effect on the
λ= l/ d=aspect ratio
date of material purchase, form a part of this specification to
the extent referenced herein.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
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This specification is under the jurisdiction ofASTM Committee A01 on Steel, the ASTM website.
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Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee AvailablefromAmericanConcreteInstitute(ACI),P.O.Box9094,Farmington
A01.05 on Steel Reinforcement. Hills, MI 48333-9094, http://www.concrete.org.
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Current edition approved Oct. 1, 2011. Published October 2011. Originally Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
approved in 1985. Last previous edition approved in 2006 as A820/A820M–06. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
DOI: 10.1520/A0820_A0820M-11. dodssp.daps.dla.mil.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A820/A820M − 11
3.2.1 The subscript n on dimensional units indicates “nomi- parent source material or finished fiber; (2) for cut sheet fibers,
nal” and the subscript e indicates “equivalent.” “Nominal” and Type II,theareacalculatedfromtheactual
...