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Innovating with GFRP Rebars
Product Overview
FRP Rebar is a lightweight spiral wrapped fiber rod, manufactured using glass, carbon, aramid, or basalt along with Epoxy/Vinyl resin. It is a non-corrosive alternative over steel developed for concrete reinforcement applications. Corrosion of steel is one of the main deteriorating mechanisms that significantly degrades traditionally reinforced concrete elements leading to a reduced service-life of infrastructure components. Improved durability of concrete structures is becoming more important for many civil applications, non corrosive materials such as fiber reinforced polymer (FRP) reinforcing bars (rebars) – in substitution of steel- are a viable option.
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Physical and Mechanical Properties
GFRP REBARS -TECHNICAL DATA SHEET
Rebar Dia (mm) | Mean Cross Section (Sq.mm) | Mean Weight (Kg/Mtr) | Running Length in 1 Ton (Mtrs) | Mean Tensile Force (KN) | Tensile Strength (Mpa) | Tensile Strain (%) | Tensile Modulus of Elasticity (Gpa) |
6 | 28 | 0.06 | 16667 | 33 | 1200 | 1.5 – 2.0 | 46-55 |
8 | 50 | 0.1 | 10000 | 54 | 1100 | 1.5 – 2.0 | 46-55 |
10 | 78 | 0.155 | 6452 | 78 | 1000 | 1.5 – 2.0 | 46-55 |
12 | 113 | 0.225 | 4444 | 100 | 900 | 1.5 – 2.0 | 46-55 |
16 | 201 | 0.4 | 2500 | 170 | 850 | 1.5 – 2.0 | 46-55 |
20 | 314 | 0.62 | 1613 | 250 | 800 | 1.5 – 2.0 | 46-55 |
25 | 490 | 0.98 | 1020 | 365 | 750 | 1.5 – 2.0 | 46-55 |
GFRP DESIGNING CODES & STANDARDS
GFRP Rebar can be used in all kind of concrete structure as prescribed in ACI 440 & IS18256/18255 design methodology. Structural designers can refer ACI 440 when they design the structure with FRP Rebars. Additional calculations and measures are required while designing the RCC structure with GFRP Rebars.
- AASHTO GFRP-1 (2009) “AASHTO LRFD Bridge Design Guide Specifications for GFRP-Reinforced Concrete. Bridge Decks and Traffic Railings”, American Association of State Highway and Transportation Officials.
- ACI 440.1R-15 (2015) “Guide for the Design and Construction of Structural Concrete Reinforced wit Fiber-Reinforced Polymer Bars”, ACI Committee 440, American Concrete Institute
- ACI 440.5-08 (2008) “Specification for Construction with Fiber-Reinforced Polymer Reinforcing Bar”, ACI Committee 440, American Concrete Institute
- IRC:137-2022 – : Guidelines on use of fibre reinforced polymer bars in road projects. (PART 1: Glass fibre reinforced polymer bars)
- IS 18256 : 2023 – Solid Round Glass Fibre Reinforced Polymer (GFRP) Bars for Concrete Reinforcement Specification
- ACI CODE-440.11-22 :Building code requirements for structural concrete reinforcement with glass fiber reinforced polymer (GFRP) bars- Code and commentary
GFRP – TESTINGS CODES & STANDARDS
The first ASTM Standard ever for the Specifications of GFRP bars was released in August 2017. ASTM D7957 (2017) “Standard Specification for Solid Round Glass Fiber Reinforced Polymer Bars for Concrete Reinforcement”, American Society for Testing and Materials (ASTM International).
Material properties of GFRP Rebars | |
Cross-Sectional area | ASTM D 798 |
Fiber content | ASTM D 2584 |
Moisture absorption /mass change | ASTM D 570 |
Transverse shear properties | ASTM D 7617 |
Horizontal shear properties | ASTM D 4475 |
Tensile properties | ASTM D 7205 |
Bond to concrete strength | ACI 440.3R,B.3 |
IS 18255 : 2023 Fibre-Reinforced Polymer (FRP) Bars for Concrete Reinforcement — Methods of Test
Design Codes
