A novel development of ultra-high-performance concrete with calcium oxide-activated materials and fibers: engineering properties and sustainability evaluation

This study developed a novel ultra-high-performance concrete using calcium oxide-activated materials (UHPC-CAM) and modified synthetic macro and glass fibers. The mechanical and durability properties of the UHPC-CAM samples with different fiber types were tested and compared. The microstructure of the samples was examined by scanning electron microscopy (SEM). The environmental impacts of the mix designs were assessed by the IMPACT 2002+ method, a life cycle assessment (LCA) tool. The results showed that the UHPC-CAM had a high compressive strength of over 110 MPa and improved ductility when glass and synthetic macro fibers were used. The samples also had low water absorption and high electrical resistance, indicating low corrosion risk. The SEM analyses showed that the synthetic macro fibers created a denser geopolymer matrix than the glass fibers. The UHPC-CAM had lower environmental impacts than conventional UHPC in terms of human health, ecosystem quality, carbon footprint, and resources. Synthetic macro fibers were the most eco-friendly fibers for UHPC-CAM production.