AECOM is pioneering the use of next-generation construction materials to improve sustainability and performance. Recent initiatives include the implementation of precast Steel Fiber Reinforced Concrete (SFRC) tunnel segmental lining, S960 ultra-high strength steel and S690 high strength steel — each contributing to greater efficiency, durability and carbon reduction. These materials have been successfully applied in infrastructure projects across Hong Kong, setting new benchmarks for sustainable development.
Steel Fiber Reinforced Concrete (SFRC) tunnel segmental lining
This innovative material has been successfully applied in metro systems around the world. Known for its enhanced crack resistance and corrosion protection, SFRC contributes to improved tunnel durability and reduces CO₂ emissions by more than 28% compared to conventional methods, supporting more sustainable infrastructure development.
AECOM advocated for its use in Hong Kong, successfully receiving the first-ever approval from the Buildings Department for the use of precast SFRC segment linings as permanent tunnel support in 2025. This solution is now being applied in two major highway projects in Hong Kong, marking a critical step toward the wide adoption of precast SFRC segment linings in future tunneling projects across the city.
Concrete canvas and fiber-reinforced shotcrete
Concrete canvas and fiber-reinforced shotcrete are two innovative materials being explored for use in emergency slope stabilization works. Considered as surface protection solutions for landslide scars, these materials can significantly shorten construction period for works at height, lowering safety risks for workers. These forward-looking approaches enhance both efficiency and safety in challenging site conditions.
Following the extreme rainfall on September 8, 2023, AECOM was urgently engaged by the Civil Engineering and Development Department, Lands Department, Highways Department, and Hong Kong Housing Authority to inspect several landslide sites and over 400 slopes across Hong Kong. As part of the emergency response, concrete canvas was adopted to enable rapid slope protection with minimal manpower, reducing working-at-height risks.
S690 high strength steel
AECOM introduced the first use of this sustainable material in the construction of two landmark arch bridges in Tseung Kwan O — the Cross Bay Link and the Promenade Southern Bridge — achieving carbon reductions of 22 percent and 18 percent, respectively, compared to conventional structural steel. The success of these projects has since encouraged wider adoption of this material in infrastructure works, contributing to more nature positive development across the region.
S960 ultra-high strength steel
Designed to reduce carbon emissions through lower steel consumption and overall structural weight, S960 ultra-high strength steel supports the city’s vision for a sustainable environment via more sustainable construction practices. This material also streamlines on-site procedures, enhancing efficiency, safety and reducing environmental impact.
S960 ultra-high strength steel has been successfully applied in two footbridges within the Northern Metropolis, showcasing its potential for broader use in future urban infrastructure projects. This design innovation led to an approximate 90% reduction in the circular bridge deck and 4 link bridges’ weight, resulting in several benefits:
- Cost savings: The project’s total cost was reduced by approximately 30% through the elimination of two supporting piers and pile foundations.
- Low-carbon engineering: The lightweight design and streamlined construction process resulted in an overall carbon footprint reduction of 65%.
- Time efficiency: The construction period was shortened by three months.
- Simplified logistics: The lighter components reduced the difficulty and complexity of transportation and on-site lifting.