ASTM A820/A820M-22

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 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.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Aug-2022
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A820/A820M −22
Standard Specification for
1
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.
1. Scope* 2. Referenced Documents
1.1 This specification covers minimum requirements for 2.1 The following documents, of the issue in effect on the
date of material purchase, form a part of this specification to
steel fibers intended for use in fiber-reinforced concrete. Five
the extent referenced herein.
types of steel fibers for this purpose are defined as pieces of
2
smooth or deformed cold-drawn wire; smooth or deformed cut
2.2 ASTM Standards:
sheet; melt-extracted fibers; mill-cut or modified cold-drawn
A370Test Methods and Definitions for Mechanical Testing
wire steel fibers that are sufficiently small to be dispersed at
of Steel Products
random in a concrete mixture.
A700Guide for Packaging, Marking, and Loading Methods
for Steel Products for Shipment
1.2 This specification provides for measurement of
C1116/C1116MSpecification for Fiber-Reinforced Concrete
dimensions, tolerances from specified dimensions, and re-
3
quired minimum physical properties, and prescribes testing 2.3 ACI Documents:
procedures to establish conformance to these requirements. ACI 506.1Guide to Fiber-Reinforced Shotcrete
ACI 544.1RCommittee Report on Fiber-Reinforced Con-
1.3 In the case of conflict between a requirement of a
crete
product specification and a requirement of this specification,
4
2.4 U.S. Federal Standards:
the product specification shall prevail. In the case of a conflict
Fed. Std. No. 123Marking for Shipment (Civil Agencies)
between a requirement of the product specification or a
4
2.5 U.S. Military Standards:
requirement of this specification and a more stringent require-
MIL-STD-129Marking for Shipment and Storage
ment of the purchase order, the purchase order shall prevail.
The purchase order requirements shall not take precedence if
3. Terminology
they, in any way, violate the requirements of the product
specification or this specification; for example, by the waiving 3.1 Definitions of Terms Specific to This Standard:
of a test requirement or by making a test requirement less 3.1.1 deformed fiber, n—a fiber that is bent, flattened, or
stringent. roughened to improve mechanical bond to the concrete matrix.
3.1.2 modified fiber, n—a cold-drawn wire fiber whose
1.4 The values stated in either SI units or inch-pound units
cross-section has been changed from circular by shaving the
are to be regarded separately as standard. The values stated in
wire.
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining 3.1.3 nominal length, n—the length of a deformed fiber,
values from the two systems may result in non-conformance
out-to-out, after being deformed.
with the standard.
3.1.4 range of equivalent diameter, d ,n—a set of limits
e-r
1.5 This international standard was developed in accor- placed on the equivalent diameter by the specifier. See 8.1.6
and Note 3.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3.2 Symbols—The following symbols used in this specifi-
Development of International Standards, Guides and Recom-
cation are defined as follows:
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel, the ASTM website.
3
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee Available from American Concrete Institute (ACI), 38800 Country Club Dr.,
A01.05 on Steel Reinforcement. Farmington Hills, MI 48331-3439, http://www.concrete.org.
4
Current edition approved Sept. 1, 2022. Published September 2022. Originally Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
approved in 1985. Last previous edition approved in 2016 as A820/A820M–16. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
DOI: 10.1520/A0820_A0820M-22. dodssp.daps.dla.mil.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor D
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A820/A820M − 16 A820/A820M − 22
Standard Specification for
1
Steel Fibers for Fiber-Reinforced Concrete
This standard is issued under the fixed designation A820/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.
1. 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 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.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 The following documents, of the issue in effect on the date of material purchase, form a part of this specification to the extent
referenced herein.
2
2.2 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
C1116/C1116M Specification for Fiber-Reinforced Concrete
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.05
on Steel Reinforcement.
Current edition approved June 1, 2016Sept. 1, 2022. Published June 2016September 2022. Originally approved in 1985. Last previous edition approved in 20152016 as
A820/A820M – 15.A820/A820M – 16. DOI: 10.1520/A0820_A0820M-16.10.1520/A0820_A0820M-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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
1

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A820/A820M − 22
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2.3 ACI Documents:
ACI 506.1 Guide to Fiber-Reinforced Shotcrete
ACI 544.1R Committee Report on Fiber-Reinforced Concrete
4
2.4 U.S. Federal Standards:
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
4
2.5 U.S. Military Standards:
MIL-STD-129 Marking for Shipment and Storage
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 deformed fiber, n—a fiber that is bent, flattened, or roughened to improve mechanical bond to the concrete matrix.
3.1.2 modified fiber, n—a cold-drawn wire fiber whose cross-section has been changed from circular by shaving the wire.
3.1.3 nominal length, n—the length of a deformed fiber, out-to-out, after being deformed.
3.1.4 range of equivalent diameter, d , n—a set of limits placed on the equivalent diameter by the specifier. See 8.1.6 and Note
e-r
3.
3.2 Symbols—The following sy
...