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Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement
:
Available format(s): Hardcopy, PDF
Superseded date: 24-03-2022
Language(s): English
Published date: 22-09-2017
Publisher: American Society for Testing and Materials
CONTAINED IN VOL. 15.03, 2017 Defines glass fiber reinforced polymer (GFRP) bars, provided in cut lengths and bent shapes and having an external surface enhancement for concrete reinforcement.
1.1This specification covers glass fiber reinforced polymer (GFRP) bars, provided in cut lengths and bent shapes and having an external surface enhancement for concrete reinforcement. Bars covered by this specification shall meet the requirements for geometric, material, mechanical, and physical properties described herein.
1.2Bars produced according to this standard are qualified using the test methods and must meet the requirements given by Table 1. Quality control and certification of production lots of bars are completed using the test methods and must meet the requirements given in Table 2.
TABLE 1 Property Limits and Test Methods for QualificationA
Property
Limit
Test Method
Mean Glass Transition Temperature
Midpoint temperature ≥100 °C [212 °F]
ASTM E1356
Mean Degree of Cure
≥95 %
ASTM E2160
Mean Measured Cross-Sectional Area
Table 3
ASTM D7205/D7205M, subsection 11.2.5.1
GuaranteedB Ultimate Tensile Force
ASTM D7205/D7205M
Mean Tensile Modulus of Elasticity
≥44,800 MPa [6 500 000 psi]
Mean Ultimate Tensile Strain
≥1.1 %
GuaranteedB Transverse Shear Strength
≥131 MPa [19 000 psi]
ASTM D7617/D7617M
GuaranteedB Bond Strength
≥7.6 MPa [1100 psi]
ASTM D7913/D7913M
Mean Moisture Absorption to Saturation
≤1.0 % to saturation at 50 °C [122 °F]
ASTM D570, subsection 7.4
Mean Alkaline Resistance
≥80 % of initial mean ultimate tensile force following 90 days at 60 °C [140 °F]
ASTM D7705/D7705M, Procedure A
GuaranteedB Ultimate Tensile Force of Bent Portion of Bar
≥60 % of the values in Table 3
ASTM D7914/D7914M
TABLE 2 Property Limits and Test Methods for Quality Control and CertificationA,B
Fiber Mass Content
≥70 %
ASTM D2584 or ASTM D3171
Glass Transition Temperature
Degree of Cure
Measured Cross-Sectional Area
Ultimate Tensile Force
Tensile Modulus of Elasticity
≥44 800 MPa [6 500 000 psi]
Ultimate Tensile Strain
Moisture Absorption in 24 h
≤0.25 % in 24 h at 50 °C [122 °F]
TABLE 3 Geometric and Mechanical Property Requirements
Bar Designation No.
Nominal Dimensions
Measured Cross-Sectional Area Limits mm2 [in.2]
Minimum Guaranteed Ultimate Tensile Force kN [kip]
Diameter mm [in.]
Cross-Sectional Area mm2 [in.2]
Minimum
Maximum
M6 [2]
6.3 [0.250]
32 [0.049]
30 [0.046]
55 [0.085]
27 [6.1]
M10 [3]
9.5 [0.375]
71 [0.11]
67 [0.104]
104 [0.161]
59 [13.2]
M13 [4]
12.7 [0.500]
129 [0.20]
119 [0.185]
169 [0.263]
96 [21.6]
M16 [5]
15.9 [0.625]
199 [0.31]
186 [0.288]
251 [0.388]
130 [29.1]
M19 [6]
19.1 [0.750]
284 [0.44]
268 [0.415]
347 [0.539]
182 [40.9]
M22 [7]
22.2 [0.875]
387 [0.60]
365 [0.565]
460 [0.713]
241 [54.1]
M25 [8]
25.4 [1.000]
510 [0.79]
476 [0.738]
589 [0.913]
297 [66.8]
M29 [9]
28.7 [1.128]
645 [1.00]
603 [0.934]
733 [1.137]
365 [82.0]
M32 [10]
32.3 [1.270]
819 [1.27]
744 [1.154]
894 [1.385]
437 [98.2]
1.3The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.
1.4The following FRP materials are not covered by this specification:
1.4.1Bars made of more than one load-bearing fiber type (that is, hybrid FRP).
1.4.2Bars having no external surface enhancement (that is, plain or smooth bars, or dowels).
1.4.3Bars with geometries other than solid, round cross sections.
1.4.4Pre-manufactured grids and gratings made with FRP materials.
1.5This specification is applicable for either SI (as Specification D7957M) or inch-pound units (as Specification D7957).
1.6The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.7This 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.
1.8This 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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