AU
NZ
UK
Video
FRP Rebar for Corrosion-Resistant Concrete Structures
This webinar introduces Treadwell’s FRP rebar offering in partnership with SFT Canada, with a focus on solving corrosion challenges in Australian and New Zealand infrastructure.
Corrosion of steel reinforcement is a primary global cost driver. International studies estimate that corrosion losses amount to roughly 3 to 4 per cent of global GDP, primarily due to the repair and replacement of deteriorated assets. In marine, coastal, water, and transport infrastructure, traditional steel rebar can experience accelerated corrosion, leading to cracking, spalling, and higher lifecycle costs.
FRP rebar – especially glass fibre reinforced polymer (GFRP) bar – offers a non-corrosive alternative. It uses continuous glass fibres as reinforcement within a polymer matrix, such as vinyl ester or epoxy, manufactured by pultrusion into continuous bars that can be cut to length.
The session covers:
- How FRP rebars are made and the material options
- Mechanical and durability advantages compared to steel
- International design standards are currently used for FRP reinforcement.
- Treadwell’s product range and typical diameters and shapes
- Real-world case studies in Australia, Canada, the United States and the Middle East
- Practical limitations, design considerations, and Q&A with SFT Canada
Key Benefits of FRP Rebar
Corrosion Resistance and Longer Design Life
GFRP rebar does not rust, eliminating the electrochemical corrosion mechanism that affects steel in chloride-rich or chemically aggressive environments, such as marine structures, bridge decks, and wastewater assets.
This can significantly extend the service life of concrete elements without the need for heavy concrete cover, complex coating systems or cathodic protection, especially in coastal, de-icing salt, or wastewater conditions.
The webinar notes design has a service life of 80 to 100 years when properly designed and detailed, consistent with durability-focused guidance in international FRP design documents.
High Tensile Strength and Lightweight Handling
Typical GFRP rebars provide tensile strengths of 600 to 1000 MPa, often two to three times higher than conventional steel reinforcement grades used in civil works.
Despite their high tensile capacity, GFRP rebars are about four to five times lighter than steel, reducing manual handling effort, improving safety, and reducing lifting and crane requirements on congested or complex sites.
Non-Conductive and Non-Magnetic
FRP rebars are electrically non-conductive and non-magnetic, which means they do not interfere with sensitive instrumentation or create stray current paths.
In substations, rail environments and medical or research facilities, this can eliminate or reduce the need for bonding and earthing of reinforcement mats, and avoid electromagnetic interference issues that can arise with steel.
Improved Crack Control and Bond Performance
Surface-treated GFRP rebars can achieve bond strengths to concrete that are comparable to or higher than those of steel, with bond values 1.4 to 2.0 times those of plain bars in several test programs.
The webinar highlights typical bond strengths of 18-20 MPa in some systems, compared with approximately 10 MPa for conventional steel bars in similar tests, supporting reasonable crack control when spacing and detailing follow FRP design standards.
Lifecycle and Sustainability Advantages
Although the production of FRP bars is energy-intensive, research shows that the non-corrosive nature and extended service life of GFRP reinforcement can reduce lifecycle maintenance and replacement emissions in severe environments compared with conventional steel-reinforced concrete, which requires periodic repair and protective treatments.
The webinar notes that lower weight can also reduce transport emissions and simplify installation logistics compared with steel.
Design Support Through Established Standards
While Australia does not yet have a dedicated FRP rebar design standard, the webinar references several well-established international documents:
- ACI 440.1R guide for FRP reinforced concrete structures
- CSA S806 in Canada for FRP reinforcing and prestressing
- AASHTO LRFD guidance and state-level specifications in North America
These provide designers with a reliable framework for strength and serviceability checks, including lower elastic modulus, deflection control, crack width limits, development length, and bar spacing rules.
Applications of FRP Rebar
The webinar positions FRP rebar as a complementary technology rather than a full replacement for steel. It is best applied where corrosion, access or electromagnetic issues justify its specific advantages.
Non-Structural and Crack Control Applications
- Slabs on grade
Used primarily for shrinkage and temperature crack control rather than flexural capacity in industrial floors, pavements, factory slabs and external hardstands. Here, the high tensile strength and non-corrosive nature of GFRP make it a robust alternative to steel mesh, particularly where de-icing salts, heavy wash down or chemical exposure are present. - Light-duty slabs and toppings
Warehouse slabs, parking decks, garage slabs and toppings where crack control dominates, and serviceability is key.
Structural FRP Rebar Uses
When higher modulus products are used, and international design standards are followed, the webinar notes that FRP rebars can be used structurally in:
- Bridge and viaduct deck slabs
GFRP has been widely used in bridge decks in North America to address chloride-induced corrosion from deicing salts and marine spray zones. - Tunnel linings and soft eye segments
FRP reinforcement is well-suited to tunnel segments and sacrificial soft eyes, where non-magnetic behaviour and ease of cutting during TBM operations are essential, as well as resistance to aggressive groundwater or sewage environments. - Marine and waterfront structures
Pontoon decks, floating walkways and transition slabs where steel rebar is highly exposed to chlorides. The webinar references AS 5204, which covers floating concrete pontoons and permits GFRP reinforcement for durability-critical components. - Retaining and barrier walls
Barrier walls and diaphragm walls in roadside or coastal environments, where eliminating steel corrosion can significantly extend service life. - Substations and rail infrastructure
Structural slabs, plinths and barriers in substations and rail corridors where non-conductive reinforcement improves electrical safety and simplifies earthing layouts. - Parking structures and garages
Elevated slabs, ramps and toppings exposed to chlorides and wash down water, where recurring steel corrosion repairs can otherwise be very costly.
Ancillary FRP Rebar Products
The webinar also notes the availability of:
- Closed stirrups and shear links
- Bent bars for beams and slabs, fabricated in controlled factory conditions from shop drawings
- Rock bolts and ground anchors using appropriate bar types
- Work in progress on mesh-type FRP solutions that may offer functional alternatives to standard steel meshes, such as SL62 and SL82, in suitable applications
Thermoset-based GFRP rebars cannot be bent on site; bends are factory-formed. The presenters also mention emerging research on thermoplastic-based FRP rebars that may enable controlled on-site bending in the future, but this remains in development and is not yet a mainstream commercial solution.
Key Moments
- 00:15 👋 Introduction of the webinar and guest speakers, Rashnish, Toi, and Ahmed.
- 02:06 💡 Corrosion costs Australia an estimated 3.5 to 5% of its annual GDP, emphasizing the need for FRP solutions.
- 03:59 🔗 FRP rebars are made through a process called pultrusion, using materials like glass fibers and epoxy resins.
- 04:33 📈 FRP rebars have a tensile strength nearly three times that of conventional steel and a longer design life of over 80 years.
- 06:12 🌍 Producing glass fiber reinforced rebars has a carbon footprint 35–45% lower than conventional steel options.
- 08:33 📜 Currently, Australia lacks specific design standards for FRP rebars while international codes guide usage and construction.
- 09:25 🚀 FRP rebars can be used in diverse applications including bridges, tunnels, and barrier walls, with a variety of sizes available.
- 10:07 🔍 Global acceptance of FRP products is growing, though Australia sees it as a new and developing market.
- 19:00 🏗️ Bends in FRP bars can only be made at the manufacturing stage, not on site, especially for small-radius bends.
- 27:47 💰 Total project costs including installation and logistics show FRP can be more cost-effective than steel over time, despite a higher initial price.
Why Treadwell?
The session concludes by explaining what makes Treadwell a capable partner for FRP rebar projects in Australia and New Zealand.
1. Partnership with a Proven Global FRP Rebar Producer
Treadwell collaborates with SFT Canada, whose GFRP rebars have been used in many international projects, such as:
- Bridge decks and pavements in Canada and the United States
- Industrial slabs and factory floors in North America
- Large-scale water and canal works in the Middle East
SFT products are tested in leading FRP research universities and hold internationally recognised approvals, such as ICC ESR reports, which support engineering acceptance in markets like Australia that have not yet finalised local FRP rebar design standards.
2. Local Project Experience and Growing Australian Adoption
The webinar highlights Australian references where GFRP reinforcement has already been used or specified, including:
- Marine and coastal projects, such as pontoons and jetties
- Road and bridge projects where corrosion risk is high
- Emerging specifications within state transport authorities, for example, Queensland guidance that recognises GFRP as acceptable reinforcement in certain marine and pontoon applications.
Treadwell is actively involved in these projects and tracks evolving local standards and technical notes.
3. Engineering Support for Steel to FRP Conversion
Because FRP rebar has a different elastic modulus and behaviour from steel, a one-to-one substitution is not always appropriate for structural elements. Treadwell and SFT offer:
- Support to convert existing steel designs to FRP designs using ACI, CSA and other FRP codes
- Guidance on bar spacing, development length, crack width checks and deflection control
- Assistance in choosing between non-structural grade bars and higher modulus structural bars
This reduces risk for designers and asset owners who are using FRP rebar for the first time.
4. Integrated FRP Solutions Across the Asset
Unlike suppliers who only provide reinforcement, Treadwell offers a complete FRP ecosystem that can be combined with FRP rebar:
- FRP grating, handrail and access structures
- FRP structural profiles and beams
- FRP cable management and fencing systems
- Anti-slip and retrofit surfacing products
This allows designers to address corrosion, electrical, and maintenance challenges holistically rather than piecemeal.
5. Lifecycle Value and Reduced Risk
By combining non-corrosive reinforcement with durable FRP superstructure elements, Treadwell can help:
- Cut long-term repair and maintenance costs
- Reduce the risk of unplanned closures, loss of service and safety incidents caused by corrosion-related deterioration
- Improve total cost of ownership compared with heavily protected steel-based solutions, especially in harsh environments
For project-specific advice, the webinar encourages engineers and asset owners to share drawings and exposure conditions so that Treadwell’s team and SFT can recommend appropriate FRP bar types, detailing, and design approaches that optimise the use of FRP rebar in Australian conditions.
