Revolutionizing Tunnel Construction with Carbon-Saving Permanent Spray Concrete Lining
What we do


In the world of construction, tunnels are the unsung heroes of urban development. They facilitate efficient transportation, house essential infrastructure, and support modern communication networks. Yet, the tunnel construction industry has been grappling with a significant environmental challenge: the carbon footprint associated with concrete linings. However, there's hope on the horizon. Let's delve into how a transformative approach can minimize carbon emissions, enhance sustainability, and revolutionize tunnel construction.

Unlocking the Potential of Underground Space

Underground spaces are the hidden gems of sustainable urban planning. They provide innovative solutions to cope with limited surface area. The benefits of these subterranean realms extend far beyond transportation; they also house vital water delivery networks, wastewater treatment systems, and communication infrastructure. By harnessing the power of underground spaces, cities can optimize resource management and reduce their environmental impact, paving the way for a greener, more sustainable future.

Spray Lining

A Sustainable Transformation

To tackle this challenge, we must first examine the pillars of tunnel construction: steel and concrete. Steel fibers have emerged as a game-changer in concrete reinforcement. They offer improved efficiency, durability, and sustainability, reducing the need for traditional reinforcement methods, especially in precast linings.

The Role of High Performance Dramix® Steel Fiber

High Performance Dramix® Steel Fiber is poised to play a pivotal role in this transformation. By incorporating steel fiber reinforcement into tunnel segments, we can significantly decrease the embodied carbon compared to conventional bar reinforcement methods. Here's the math: traditional steel rebars can contribute between 90 to 160 kg/m3 of carbon emissions, taking into account a CO factor of 1.85 for steel. In contrast, the mass of high-performance steel fibers, such as Dramix® 4D 80/60BGP, per unit concrete volume in tunnel segments is only about 40 kg/m3, aligning with standard performance class 5e as per MC 2O10 guidelines for such applications with Fiber Reinforced Concrete (FRC). This translates to a remarkable 4.7 to 8.4 times reduction in CO emissions.


The future of tunnel construction is evolving, driven by a commitment to sustainability and carbon reduction. By adopting innovative approaches like high-performance steel fibers and optimizing concrete thickness, we can minimize the carbon footprint associated with tunnel linings. As cities continue to grow, these environmentally conscious practices will become increasingly vital, contributing to a greener, more sustainable urban future where tunnels play a key role in shaping the world beneath our feet.