GRP Pultruded Profiles

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Case Study


In the construction of high-speed railways, such as the HS2 project, ensuring the long-term durability and structural integrity of tunnel wall pillars is of utmost importance. These pillars support the tunnel infrastructure and must also accommodate various cable ducts. This case study investigates how Engineered Composites GRP (Glass Reinforced Plastic) rebar proves to be the perfect choice for these pillars, offering significant advantages over normal steel rebar.

The Challenge

When designing the tunnel wall pillars for the HS2 project, engineers faced the challenge of selecting a material that offered both strength and durability while allowing for the smooth installation and maintenance of cable ducts. Traditional steel rebar posed several drawbacks in this scenario. Steel corrodes over time in the presence of moisture, and its magnetic properties can interfere with electrical systems. Moreover, steel rebar’s electrical conductivity can be problematic when cable ducts and electrical installations are in close proximity.

The Solution: Engineered Composites GRP Rebar

To overcome these challenges, Engineered Composites GRP rebar was chosen as the ideal solution for the tunnel wall pillars. The unique properties of GRP rebar offer significant advantages over traditional steel rebar in this specific application.

1. Corrosion Resistance
Unlike steel, GRP rebar is not susceptible to corrosion. It does not rust, deteriorate, or weaken when exposed to moisture, ensuring the long-term durability of the tunnel wall pillars. This inherent corrosion resistance minimizes the maintenance and repair costs associated with steel rebar, contributing to the long-term cost-effectiveness of the project.

2. Non-Magnetic and Non-Conductive
Engineered Composites GRP rebar is non-magnetic and non-conductive, making it an excellent choice when cable ducts need to pass through the tunnel wall pillars. The absence of magnetic properties eliminates potential interference with electrical systems, ensuring the smooth operation of the railway infrastructure. Additionally, the non-conductive nature of GRP rebar prevents electrical conductivity issues that can arise when steel rebar is used near sensitive electrical installations.

3. Lightweight and Easy Installation GRP rebar is significantly lighter than steel rebar, simplifying handling and installation processes, thereby reducing construction time and costs. The lightweight nature of GRP rebar allows for more efficient transportation and handling, making it an attractive option for large-scale construction projects like HS2.
4. Excellent Mechanical Properties Engineered Composites GRP rebar possesses high tensile strength and stiffness, comparable to steel but without the drawbacks of corrosion. This strength ensures the structural integrity of the tunnel wall pillars, providing long-lasting support for the railway infrastructure.

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Engineered Composites GRP rebar has proven to be the perfect choice for the HS2 project’s tunnel wall pillars, especially in areas where cable ducts need to pass through. The material’s corrosion resistance, non-magnetic and non-conductive properties, lightweight nature, and excellent mechanical properties make it superior to normal steel rebar in this specific application. Choosing GRP rebar ensures the longevity, durability, and efficient operation of the tunnel wall pillars, contributing to the overall success of the HS2 project.
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