Norm

ASTM D7957/D7957M - 17 en

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

50,60 61,23 Incl BTW

Over deze norm

Status Definitief
Aantal pagina's 5
Gepubliceerd op 01-08-2017
Taal Engels

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.

Details

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

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