ASTM D8505/D8505M-23
Standard Specification for Basalt and Glass Fiber Reinforced Polymer (FRP) Bars for Concrete Reinforcement

Standard No.

ASTM D8505/D8505M-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D8505/D8505M-23

Scope

1.1 This specification covers basalt and glass fiber reinforced polymer (BFRP and GFRP, respectively) bars, provided in straight (longitudinal) cut lengths, of solid round crosssection, and having a surface enhancement for internal concrete reinforcement applications. Bars covered by this specification shall meet the requirements for geometric, material, mechanical, and physical properties as described herein. 1.2 Subsection 1.6 defines the type of FRP bars that are out of the scope of this specification. 1.3 Bars produced according to this standard are qualified using the test methods and must meet the requirements given in 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. 1.4 The standard sizes and dimensions of FRP bars and their number designations are given in Table 3. 1.5 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. 1.6 The following FRP bar materials are not covered by this specification: 1.6.1 Bars made of more than one load-bearing fiber types or different grade fibers (that is, hybrid FRP). 1.6.2 Bars made from fibers other than glass or basalt. 1.6.3 Bars having no external surface enhancement (that is, plain or smooth bars, or dowels). 1.6.4 Bars with geometries other than solid, round cross sections. 1.6.5 Pre-manufactured grids and gratings made with FRP materials. 1.6.6 Bent bars (that is, bars that are not made of straight, continuous lengths). NOTE 1—Bent bars may include stirrups and hoops. Refer Specification D7957/D7957M for GFRP bent bar specifications. 1.7 This specification is applicable for either SI (as Specification D8505M) or US units (as Specification D8505). 1.8 The values stated in either SI units or US units are to be regarded as standard. Within the text, the US 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. 1.9 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. 1.10 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. 1 This specification is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.10 on Composites for Civil Structures. Current edition approved April 1, 2023. Published April 2023. DOI: 10.1520/ D8505_D8505M-23. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 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. 1 TABLE 1 Property Limits and Test Methods for QualificationA Property Limit Test Method Mean Glass Transition Temperature $ 100 °C [212 °F] (DSC) E1356 $ 110 °C [230 °F] (DMA) D7028 Mean Degree of Cure $ 95 % E2160 Mean Measured Cross-Sectional Area Table 3 D7205/D7205M, subsection 11.2.4.1 GuaranteedB Ultimate Tensile Force Table 3 D7205/D7205M Guaranteed Ultimate Tensile Strength Report value Mean Tensile Modulus of Elasticity $ 60 000 MPa [8 700 000 psi] Mean Tensile Modulus of Elasticity (using measured Cross-Sectional Area) Report value Mean Ultimate Tensile Strain $ 1.1 % Mean Transverse Shear Strength $ 152 MPa [22 000 psi] D7617/D7617M Mean Apparent Horizontal Shear Strength $ 37.9 MPa [5 500 psi] D4475 Mean Bond Strength Table 3 D7913/D7913M Mean Moisture Absorption # 0.25 % in 24 hrs. at 50 °C [122 °F], and # 1.0 % to saturation at 50 °C [122 °F] D570, subsection 7.4 Mean Alkaline Resistance $ 80 % of initial mean ultimate tensile force following 90 days at 60 °C [140 °F] D7705/D7705M, Procedure A $ 75 % of initial mean ultimate tensile force following 90 days at 60 °C [140 °F] D7705/D7705M, Procedure B set an initial tensile strain equal to 3000 microstrain A For the determination of the mean and guaranteed properties, at least 24 specimens (that is, test repetitions) 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 3.2.2. TABLE 2 Property Limits and Test Methods for Quality Control and Certification of Production LotsA Property Limit Test Method Fiber Mass Content $ 70 % D2584 or D3171 Glass Transition Temperature $ 100 °C [212 °F] (DSC) E1356 $ 110 °C [230 °F] (DMA) D7028 Degree of Cure $ 95 % E2160 Measured Cross-Sectional Area Table 3 D7205/D7205M, subsection 11.2.4.1 Ultimate Tensile Force Table 3 D7205/D7205M Guaranteed Ultimate Tensile Strength Report value Mean Tensile Modulus of Elasticity $ 60 000 MPa [8 700 000 psi] Mean Tensile Modulus of Elasticity (using measured Cross-Sectional Area) Report value Ultimate Tensile Strain $ 1.1 % Mean Apparent Horizontal Shear Strength $ 37.9 MPa [5 500 psi] D4475 Moisture Absorption in 24 h # 0.25 % in 24 hrs. at 50 °C [122 °F] D570, subsection 7.1 A For the determination of each of the property limits, five random specimens (i.e. test repetitions) shall be obtained from each production lot. Each individual specimen shall satisfy the property limits. TABLE 3 Geometric and Mechanical Property Requirements Bar Designation Number Nominal Dimensions Measured Cross-Sectional Area Limits mm2 [in.2 ] Minimum Guaranteed Ultimate Tensile Force kN [kip] Minimum Bond Strength MPa [psi] 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] 33 [7.4] 9.6 [1400] M10 [3] 9.5 [0.375] 71 [0.11] 67 [0.104] 104 [0.161] 71 [16.0] M13 [4] 2.7 [0.500] 129 [0.20] 119 [0.185] 169 [0.263] 124 [27.9] M16 [5] 15.9 [0.625] 199 [0.31] 186 [0.288] 251 [0.388] 181.5 [40.8] M19 [6] 19.1 [0.750] 284 [0.44] 268 [0.415] 347 [0.539] 254.9 [57.3] M22 [7] 2.2 [0.875] 387 [0.60] 365 [0.565] 460 [0.713] 337.2 [75.8] M25 [8] 25.4 [1.000] 510 [0.79] 476 [0.738] 589 [0.913] 422.1 [94.9] 7.6 [1100] M29 [9] 8.7 [1.128] 645 [1.00] 603 [0.934] 748 [1.159] 511.5 [115.0] M32 [10] 32.3 [1.270] 819 [1.27] 744 [1.154] 950 [1.473] 617.0 [138.7] D8505/D8505M − 23 2 

ASTM D8505/D8505M-23 Referenced Document

• ASTM A615/A615M Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement
• ASTM C904 Standard Terminology Relating to Chemical-Resistant Nonmetallic Materials
• ASTM D2584 Standard Test Method for Ignition Loss of Cured Reinforced Resins
• ASTM D3171 Standard Test Methods for Constituent Content of Composite Materials
• ASTM D3878 Standard Terminology Composite Materials
• ASTM D3950 Standard Specification for Strapping, Nonmetallic (and Joining Methods)*， 2023-07-01 Update
• ASTM D3953 Standard Specification for Strapping, Flat Steel and Seals
• ASTM D4475 Standard Test Method for Apparent Horizontal Shear Strength of Pultruded Reinforced Plastic Rods By The Short-Beam Method
• ASTM D4649 Standard Guide for Use of Stretch Films and Wrapping Application
• ASTM D4675 Standard Guide for Selection and Use of Flat Strapping Materials¹
• ASTM D570 Standard Test Method for Water Absorption of Plastics
• ASTM D5728 Standard Practices for Securement of Cargo in Intermodal and Unimodal Surface Transport
• ASTM D578/D578M Standard Specification for Glass Fiber Strands*， 2023-06-01 Update
• ASTM D7028 Standard Test Method for Glass Transition Temperature (DMA Tg) of Polymer Matrix Composites by Dynamic Mechanical Analysis (DMA)*， 2024-04-22 Update
• ASTM D7205/D7205M Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars
• ASTM D7617/D7617M Standard Test Method for Transverse Shear Strength of Fiber-reinforced Polymer Matrix Composite Bars*， 2024-04-22 Update
• ASTM D7705/D7705M Standard Test Method for Alkali Resistance of Fiber Reinforced Polymer (FRP) Matrix Composite Bars used in Concrete Construction
• ASTM D7913/D7913M Standard Test Method for Bond Strength of Fiber-Reinforced Polymer Matrix Composite Bars to Concrete by Pullout Testing
• ASTM D792 Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
• ASTM D7957/D7957M Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement
• ASTM D8448/D8448M Standard Specification for Basalt Fiber Strands
• ASTM E1356 Standard Test Method for Assignment of the Glass Transition Temperatures by Differential Scanning Calorimetry or Differential Thermal Analysis
• ASTM E2160 Standard Test Method for Heat of Reaction of Thermally Reactive Materials by Differential Scanning Calorimetry*， 2023-11-01 Update

ASTM D8505/D8505M-23 history

• 2023 ASTM D8505/D8505M-23 Standard Specification for Basalt and Glass Fiber Reinforced Polymer (FRP) Bars for Concrete Reinforcement