Nanomaterials advancements: probing environmental sustainability of alumina nanofiber dispersion for Ultra High Performance Concrete

Alumina nano-fibres, incorporated into Ultra High Performance Concrete (UHPC), play a dual role by enhancing mechanical performance and improving durability under aggressive conditions, particularly through stimulated autogenous crack sealing and performance self-healing mechanisms. The superior performance of UHPC, enriched with alumina nano-fibres, is attributed to their nano-scale reinforcing effects, exerting control over the cracking process from its initiation, and their hydrophilic nature, promoting cement and binder hydration reactions. Goal of this study is to address the environmental sustainability of alumina nano-fibres through a Life Cycle Assessment (LCA) analysis. Concentrated versions of alumina nanofibers are specifically examined, employing chemical admixtures such as polycarboxylate sodium salt (PCE) for dispersion. This strategic approach intensifies intermixing and prevents gelatinization arising from the inherent hydrophilic nature of alumina nano-fibres. Through LCA analysis, the study sheds light on the environmental footprint associated with the production and application of alumina nano-fibres in UHPC, through a broad perspective contributing valuable insights into the sustainability of these materials and enabling informed decision-making for their future applications in the construction industry.