From landmark bridges to complex tunnels and highways, next-generation construction materials are redefining how infrastructure is built — with greater efficiency, durability, and environmental responsibility.
Among these innovations is the use of S690 high strength steel and S960 ultra-high strength steel in recent bridge and highway projects. AECOM pioneered the use of S690 high strength steel in the Cross Bay Link and Promenade Southern Bridge in Tseung Kwan O, achieving carbon reductions of 22% and 18%, respectively, compared to conventional steel.
S960 was also used in two footbridges within the Northern Metropolis, significantly reducing material weight — from an estimated 5,500 tons of concrete to just 600 tons of steel for the quadruple-span circular deck plus 4 link bridges. This approach resulted in 30% cost savings and a 65% reduction in carbon emissions.
Building on these advances, 2025 marks another milestone with the introduction of Steel Fibre Reinforced Concrete (SFRC), a breakthrough material that enhances both durability performance and sustainability. SFRC received its first-ever approval from the Buildings Department for use in precast segment linings as permanent tunnel support. Known for its surface crack resistance and elimination of concrete spalling from steel corrosion, SFRC improves tunnel durability and cuts carbon emissions by over 28%. Already used in metro systems worldwide, it is now being applied in two major highway projects in Hong Kong.
The adoption of these innovative materials represents a significant step toward supporting Hong Kong’s carbon neutrality target by 2050. AECOM’s involvement in these initiatives contributes to the broader integration of sustainable solutions within the construction industry and creates opportunities for continued progress in environmentally responsible development.