ASTM D7957 / D7957M - 17

    Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement

    Active Standard ASTM D7957 / D7957M | Developed by Subcommittee: D30.10

    Book of Standards Volume: 15.03


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    1. Scope

    1.1 This 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.

    1.2 Bars 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

    Table 3

    ASTM D7205/D7205M

    Mean Tensile Modulus of Elasticity

    44,800 MPa [6 500 000 psi]

    ASTM D7205/D7205M

    Mean Ultimate Tensile Strain

    1.1 %

    ASTM D7205/D7205M

    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

    (A) For the determination of the mean and guaranteed properties, at least 24 samples shall be obtained in groups of eight or more from three or more different production lots. The mean and guaranteed properties shall satisfy the limits.
    (B) Guaranteed property is defined in 3.2.5.

    TABLE 2 Property Limits and Test Methods for Quality Control and CertificationA,B

    Property

    Limit

    Test Method

    Fiber Mass Content

    70 %

    ASTM D2584 or ASTM D3171

    Glass Transition Temperature

    Midpoint temperature 100 °C [212 °F]

    ASTM E1356

    Degree of Cure

    95 %

    ASTM E2160

    Measured Cross-Sectional Area

    Table 3

    ASTM D7205/D7205M, subsection 11.2.5.1

    Ultimate Tensile Force

    Table 3

    ASTM D7205/D7205M

    Tensile Modulus of Elasticity

    44 800 MPa [6 500 000 psi]

    ASTM D7205/D7205M

    Ultimate Tensile Strain

    1.1 %

    ASTM D7205/D7205M

    Moisture Absorption in 24 h

    0.25 % in 24 h at 50 °C [122 °F]

    ASTM D570, subsection 7.4

    (A) For the determination of each of the property limits, five random samples shall be obtained from each production lot. Each individual sample shall satisfy the property limits.
    (B) For bent bars, the tests are performed on the straight portion of the bars.

    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]

    1.3 The 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.

    1.4 The following FRP materials are not covered by this specification:

    1.4.1 Bars made of more than one load-bearing fiber type (that is, hybrid FRP).

    1.4.2 Bars having no external surface enhancement (that is, plain or smooth bars, or dowels).

    1.4.3 Bars with geometries other than solid, round cross sections.

    1.4.4 Pre-manufactured grids and gratings made with FRP materials.

    1.5 This specification is applicable for either SI (as Specification D7957M) or inch-pound units (as Specification D7957).

    1.6 The 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.

    1.7 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.

    1.8 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement

    C904 Terminology Relating to Chemical-Resistant Nonmetallic Materials

    D570 Test Method for Water Absorption of Plastics

    D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement

    D2584 Test Method for Ignition Loss of Cured Reinforced Resins

    D3171 Test Methods for Constituent Content of Composite Materials

    D3878 Terminology for Composite Materials

    D7205/D7205M Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars

    D7617/D7617M Test Method for Transverse Shear Strength of Fiber-reinforced Polymer Matrix Composite Bars

    D7705/D7705M Test Method for Alkali Resistance of Fiber Reinforced Polymer (FRP) Matrix Composite Bars used in Concrete Construction

    D7913/D7913M Test Method for Bond Strength of Fiber-Reinforced Polymer Matrix Composite Bars to Concrete by Pullout Testing

    D7914/D7914M Test Method for Strength of Fiber Reinforced Polymer (FRP) Bent Bars in Bend Locations

    E1356 Test Method for Assignment of the Glass Transition Temperatures by Differential Scanning Calorimetry

    E2160 Test Method for Heat of Reaction of Thermally Reactive Materials by Differential Scanning Calorimetry


    Referencing This Standard
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    DOI: 10.1520/D7957_D7957M-17

    Citation Format

    ASTM D7957 / D7957M-17, Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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