Ductal ultra-high performance concrete
Ductal® is Lafarge’s ultra-high performance concrete (UHPC) that provides a unique combination of strength, ductility, durability and aesthetics – allowing architects and engineers to create innovative designs with new shapes that are thinner, lighter and more graceful than designs with conventional concrete. Depending on the application, it is blended with metallic or polyvinyl alcohol (PVA) fibres and is significantly stronger than conventional concrete. Compressive strengths range from 150 to 225 MPa (22,000 to 33,000 psi) and flexural strengths range from 25 to 50 MPa (3000 to 7200 psi).
The façade of The Atrium, designed to curve at the corners, presented challenges for conventional systems. In order to achieve this design, the architects sought a cladding material that could form tight radial curves, rather than adapting a flat panel system, which would require cutting into small pieces and faceting.