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ASTM D7957/D7957M-17

Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement
- 발행일 : 2017-08-01
- 발행기관 : ASTM
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분야

15.03 : 공간시물레이션; 항공우주재료; 고율섬유와 합성물

적용범위

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

(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 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

(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]

이력정보

No.	표준번호	표준명	발행일	상태
1	ASTM D7957/D7957M-22상세보기	Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement	2022-02-01	표준
2	ASTM D7957/D7957M-17상세보기	Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement	2017-08-01	구판