Development and Characterization of Eco-Efficient Ultra-High Durability Concrete

Ultra-High-Performance Concrete (UHPC) is characterized by having an ultra-compact matrix resulting in ultra-high mechanical properties, low permeability to water and gases, improved ductility provided the addition of fibers. The production structures with this type concrete advantageous some situations, especially aggressive environments since it significantly increases durability. However, high dosages Portland cement silica fume are commonly adopted, increasing not only cost but also environmental impact, jeopardizing its use, mainly present context where sustainability construction sector a global priority. In sense, improving eco-efficiency mandatory. objective work develop eco-ultra-high-durability (eco-UHDC). UHDC was optimized, focusing on durability looking for lowest several parameters were varied: replacement ratio, additions binder relative proportions, water/binder fibers, proportion. developed eco-UHDC both fresh hardened states, terms time-dependent This last topic includes characterization under laboratory conditions real environment, namely, tidal zone coast Cape Verde. results resistance carbonation chloride penetration used predict service life produced these eco-UHDC. optimization allowed development mixtures 60% relation total amount powder matrix, maintaining good workability desired characteristics (compressive strength higher than 100 MPa flexural 12 MPa). showed that considering requirements related durability, cover optimized can be lower values recommended Eurocode 2, differences reach 55%, when pozzolan Verde as partial cement.