SteelFlex Sustainable Stone Mastic Asphalt

        High-performance stone mastic asphalt.

        High-performance stone mastic asphalt.

        SteelFlex™ is designed with steel slag aggregate and high-performance Polymer Modified Binder (PMB) contributing to sustainable, durable, and environmentally friendly road construction.

        Proven performance

        Steel slag enhances the mechanical properties of asphalt mixtures, and when combined with high-performing PMB, additional performance enhancements are demonstrated in the material’s performance.

        Performance statistics

        High skid resistance, crack and deformation resisting are all proven from the Research & Development stage to performance monitoring.

        SteelFlex SAMI

        SteelFlex Stress Absorbing Membrane Interlayer (SAMI) is a sustainable solution for crack prevention, waterproofing, stress absorption and enhanced durability. 

        A versatile solution that can be used in applications such as concrete-based highways, car parks and industrial estates as well as an alternative to geogrid.

        SteelPhalt products in action

        Application opportunity

        The A4161, Castle Street, in Cardiff, was originally laid on concrete. Due to high traffic volume, the surface layer needed replacing due to showing signs of fatigue.



        Recommended product

        10mm SteelFlex, made with 95% recycled steel slag aggregates, was recommended for this project as it has a high resistance to reflective cracking.

        Results and benefits

        In 2022, 1000 tonnes of material was installed and is still performing to high-performance standards. The carbon footprint was reduced by 20 kg CO2e per tonne of asphalt.

        Sustainable Asphalt Solutions

        We are the right choice for all your asphalt needs, now more than ever.
        Reach out to our team of experts today.