ASTM A820/A820M-04

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Designation: A 820/A 820M – 04
Standard Specification for
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Steel Fibers for Fiber-Reinforced Concrete
This standard is issued under the fixed designationA 820/A 820M; 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 (e) indicates an editorial change since the last revision or reapproval.
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1. Scope* 2.2 ASTM Standards:
A 370 Test Methods and Definitions for MechanicalTesting
1.1 This specification covers minimum requirements for
of Steel Products
steel fibers intended for use in fiber-reinforced concrete. Five
C 1116 Specification for Fiber-Reinforced Concrete and
types of steel fibers for this purpose are defined as pieces of
Shotcrete
smooth or deformed cold-drawn wire; smooth or deformed cut
2.3 ACI Document:
sheet; melt-extracted fibers; mill-cut or modified cold-drawn
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544.1R Committee Report on Fiber-Reinforced Concrete
wire steel fibers that are sufficiently small to be dispersed at
random in a concrete mixture.
3. Terminology
1.2 This specification provides for measurement of dimen-
3.1 Definitions of Terms Specific to This Standard:
sions, tolerances from specified dimensions, and required
3.1.1 deformed fiber, n—a fiber that is bent, flattened, or
minimum physical properties, and prescribes testing proce-
roughened to improve mechanical bond to the concrete matrix.
dures to establish conformance to these requirements.
3.1.2 modified fiber, n—a cold-drawn wire fiber whose
1.3 In the case of conflict between a requirement of a
cross-section has been changed from circular by shaving the
product specification and a requirement of this specification,
wire.
the product specification shall prevail. In the case of a conflict
3.1.3 nominal length, n—the length of a deformed fiber,
between a requirement of the product specification or a
out-to-out, after being deformed.
requirement of this specification and a more stringent require-
3.1.4 range of equivalent diameter, d , n—a set of limits
e-r
ment of the purchase order, the purchase order shall prevail.
placed on the equivalent diameter by the specifier. See 8.1.6
The purchase order requirements shall not take precedence if
and Note 3.
they, in any way, violate the requirements of the product
3.2 Symbols—The following symbols used in this specifi-
specification or this specification; for example, by the waiving
cation are defined as follows:
of a test requirement or by making a test requirement less
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A = cross-sectional area, mm [in. ]
stringent.
d = diameter, mm [in.]
1.4 The values stated in either SI units or inch-pound units
f = ultimate tensile strength, MPa [psi]
u
are to be regarded separately as the standard. Within the text,
l = length, mm [in.]
the inch-pound units are shown in brackets. The values stated
l = l/d = aspect ratio
in each system may not be exact equivalents; therefore, each
3.2.1 The subscript n on dimensional units indicates “nomi-
system shall be used independently of the other. Combining
nal” and the subscript e indicates “equivalent.” “Nominal” and
values from the two systems may result in non-conformance
“equivalent” dimensions are calculated from other measurable
with the standard.
dimensions or average mass [weight].
2. Referenced Documents
4. Classification
2.1 The following documents, of the issue in effect on the
4.1 Five general types of steel fibers are identified in this
date of material purchase, form a part of this specification to
specification based upon the product or process used as a
the extent referenced herein.
source of the steel fiber material.
4.1.1 Type I, cold-drawn wire.
4.1.2 Type II, cut sheet.
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
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Current edition approved May 1, 2004. Published May 2004. Originally For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved in 1985. Last previous edition approved in 2001 as A 820 – 01. 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
the ASTM website.
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Available from American Concrete Institute, 38800 Country Club Drive,
Farmington Hills, MI 48331.
*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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A 820/A 820M – 04
4.1.3 Type III, melt-extracted. Testing shall be in accordance with Test Methods and Defini-
4.1.4 Type IV, mill cut. tions A 370, where applicable.
4.1.5 Type V, modified cold-drawn wire.
...