ASTM A820/A820M-06
(Specification)Standard Specification for Steel Fibers for Fiber-Reinforced Concrete
Standard Specification for Steel Fibers for Fiber-Reinforced Concrete
ABSTRACT
This specification covers steel fibers intended for use in fiber-reinforced concrete. The fibers shall be straight or deformed and of Types I (cold-drawn wire), II (cut sheet), III (melt-extracted), IV (mill cut), and V ( modified cold-drawn wire). Tensile and bend tests of randomly-selected finished fibers shall be performed. Measurement of dimensions shall be performed and values should conform to permissible variations of length, nominal length, diameter, equivalent diameter, aspect ratio, and nominal aspect ratio. Guidelines for inspection, rejection, rehearing, certification, and packaging are also given.
SCOPE
1.1 This specification covers minimum requirements for steel fibers intended for use in fiber-reinforced concrete. Five types of steel fibers for this purpose are defined as pieces of smooth or deformed cold-drawn wire; smooth or deformed cut sheet; melt-extracted fibers; mill-cut or modified cold-drawn wire steel fibers that are sufficiently small to be dispersed at random in a concrete mixture.
1.2 This specification provides for measurement of dimensions, tolerances from specified dimensions, and required minimum physical properties, and prescribes testing procedures to establish conformance to these requirements.
1.3 In the case of conflict between a requirement of a product specification and a requirement of this specification, the product specification shall prevail. In the case of a conflict between a requirement of the product specification or a requirement of this specification and a more stringent requirement of the purchase order, the purchase order shall prevail. The purchase order requirements shall not take precedence if they, in any way, violate the requirements of the product specification or this specification; for example, by the waiving of a test requirement or by making a test requirement less stringent.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. Within the text, the inch-pound units are shown in brackets. 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.
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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
2 2
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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