Standard Specification for Alkali Resistant (AR) Glass Fiber for GFRC and Fiber-Reinforced Concrete and Cement

SCOPE
1.1 This specification covers minimum requirements for alkali resistant (AR) glass fibers intended for use in glass fiber-reinforced concrete (GFRC) by spray-up, glass fiber-reinforced concrete premix, fiber-reinforced concrete, and other cementitious based products.  
1.2 This specification provides for AR glass fiber types and configurations that can be readily incorporated into concrete mixes, typical physical properties, minimum zirconia content, and prescribes testing procedures to establish conformance to these requirements.  
1.3 This specification does not address the types of coatings or lubricants used in the manufacturing process of the fibers.  
1.4 In the case of conflict between a more stringent 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.  
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as 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.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 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.

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Publication Date
30-Apr-2023
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ASTM C1666/C1666M-08(2023) - Standard Specification for Alkali Resistant (AR) Glass Fiber for GFRC and Fiber-Reinforced Concrete and Cement
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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: C1666/C1666M − 08 (Reapproved 2023)
Standard Specification for
Alkali Resistant (AR) Glass Fiber for GFRC and Fiber-
1
Reinforced Concrete and Cement
This standard is issued under the fixed designation C1666/C1666M; 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 priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.1 This specification covers minimum requirements for
1.7 This international standard was developed in accor-
alkali resistant (AR) glass fibers intended for use in glass
dance with internationally recognized principles on standard-
fiber-reinforced concrete (GFRC) by spray-up, glass fiber-
ization established in the Decision on Principles for the
reinforced concrete premix, fiber-reinforced concrete, and
Development of International Standards, Guides and Recom-
other cementitious based products.
mendations issued by the World Trade Organization Technical
1.2 This specification provides for AR glass fiber types and
Barriers to Trade (TBT) Committee.
configurations that can be readily incorporated into concrete
mixes, typical physical properties, minimum zirconia content,
2. Referenced Documents
and prescribes testing procedures to establish conformance to
2
2.1 ASTM Standards:
these requirements.
D578/D578M Specification for Glass Fiber Strands
1.3 This specification does not address the types of coatings
D1577 Test Methods for Linear Density of Textile Fibers
or lubricants used in the manufacturing process of the fibers.
D2256/D2256M Test Method for Tensile Properties of Yarns
by the Single-Strand Method
1.4 In the case of conflict between a more stringent require-
D3800 Test Method for Density of High-Modulus Fibers
ment of a product specification and a requirement of this
D4963/D4963M Test Method for Ignition Loss of Glass
specification, the product specification shall prevail. In the case
Fiber Strands and Fabrics
of a conflict between a requirement of the product specification
3
or a requirement of this specification and a more stringent
2.2 ISO Standards:
requirement of the purchase order, the purchase order shall ISO 1887 Textile Glass—Determination of Combustible-
prevail. The purchase order requirements shall not take prece-
Matter Content
dence if they, in any way, violate the requirements of the
ISO 1888 Textile Glass—Staple Fibres or Filaments—
product specification or this specification; for example, by the
Determination of Average Diameter
waiving of a test requirement or by making a test requirement
ISO 1889 Reinforcement Yarns—Determination of Linear
less stringent.
Density
ISO 3341 Textile Glass Yarns—Determination of Breaking
1.5 The values stated in either SI units or inch-pound units
Force and Breaking Elongation
are to be regarded separately as standard. Within the text, the
4
inch-pound units are shown in brackets. The values stated in 2.3 EN Standards:
EN 14649 Precast Concrete Products—Test Method for
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining Strength Retention of Glass Fibre in Cement and Concrete
5
values from the two systems may result in non-conformance
2.4 Japanese Industrial Standards:
with the standard.
JISR 3420 Testing Methods of Textile Glass Products
1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
responsibility of the user of this standard to establish appro-
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.
1 3
This specification is under the jurisdiction of ASTM Committee C27 on Precast Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Concrete Products and is the direct responsibility of Subcommittee C27.40 on Glass 4th Floor, New York, NY 10036, http://www.ansi.org.
4
Fiber Reinforced Concrete. Available from European Committee for Standardization (CEN), 36 rue de
Current edition approved May 1, 2023. Published May 2023. Originally Stassart, B-1050, Brussels, Belgium, http://www.cenorm.be.
5
approved in 2007. Last previous edition approved in 2015 as C1666/ Available from Japanese Standards Organization (JSA), 4-1-24 Akasaka
C1666M – 08(2015). DOI: 10.1520/C1666_
...

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