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    ASTM D7957/D7957M : 17

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

    Standard Details

    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]

    Status : Historical
    Standard Type: Main
    Document No: ASTM D7957/D7957M : 17
    Document Year: 2017
    Pages: 5
    • Section Volume:
    • 15.03 Volume 15.03 Space Simulation; Aerospace and Aircraft; Composite Materials
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