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ASTM D7957/D7957M-17

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

NORMA vydaná dňa 1.8.2017

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Informácie o norme:

Označenie normy: ASTM D7957/D7957M-17
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.8.2017
Kód tovaru: NS-796646
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM

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Anotácia textu normy ASTM D7957/D7957M-17 :

Keywords:

ICS Number Code 91.100.30 (Concrete and concrete products)

Doplňujúce informácie

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 Qualification^A

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

Guaranteed^B 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

Guaranteed^B Transverse Shear Strength

≥131 MPa [19 000 psi]

ASTM D7617/D7617M

Guaranteed^B 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

Guaranteed^B 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 Certification^A^,^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

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.

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