ASTM A820/A820M-06

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Designation: A820/A820M – 06
Standard Specification 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. A number 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:
A370 Test 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
A700 PracticesforPackaging,Marking,andLoadingMeth-
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 Specification for Fiber-Reinforced Concrete and
sheet; melt-extracted fibers; mill-cut or modified cold-drawn
Shotcrete
wire steel fibers that are sufficiently small to be dispersed at
2.3 ACI Document:
random in a concrete mixture.
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544.1R Committee Report on Fiber-Reinforced Concrete
1.2 This specification provides for measurement of dimen-
2.4 U.S. Military Standard:
sions, tolerances from specified dimensions, and required
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MIL-STD-129 Marking for Shipment and Storage
minimum physical properties, and prescribes testing proce-
2.5 U.S. Federal Standard:
dures to establish conformance to these requirements.
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Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
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-
roughened to improve mechanical bond to the concrete matrix.
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
3.1.3 nominal length, n—the length of a deformed fiber,
of a test requirement or by making a test requirement less
out-to-out, after being deformed.
stringent.
3.1.4 range of equivalent diameter, d , n—a set of limits
e-r
1.4 The values stated in either SI units or inch-pound units
placed on the equivalent diameter by the specifier. See 8.1.6
are to be regarded separately as the standard. Within the text,
and Note 3.
the inch-pound units are shown in brackets. The values stated
3.2 Symbols—The following symbols used in this specifi-
in each system may not be exact equivalents; therefore, each
cation are defined as follows:
system shall be used independently of the other. Combining
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A = cross-sectional area, mm [in. ]
values from the two systems may result in non-conformance
d = diameter, mm [in.]
with the standard.
f = ultimate tensile strength, MPa [psi]
u
2. Referenced Documents l = length, mm [in.]
l = l/d = aspect ratio
2.1 The following documents, of the issue in effect on the
date of material purchase, form a part of this specification to
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the extent referenced herein.
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 of ASTM Committee A01 on Steel, the ASTM website.
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Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Available from American Concrete Institute, 38800 Country Club Drive,
A01.05 on Steel Reinforcement. Farmington Hills, MI 48331.
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Current edition approved March 1, 2006. Published March 2006. Originally AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
approved in 1985. Last previous edition approved in 2004 as A820 – 04. DOI: Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. Or visit: http://
10.1520/A0820_A0820M-06. assist.daps.dla.mil/online.
*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 – 06
3.2.1 The subscript n on dimensional units indicates “nomi- II, the area calculated from the actual thickness and width of
nal” and the subscript e indicates “equivalent.” “Nominal” and the
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