Optimization of the reinforced concrete beam with UHPFRC with a focus on reducing CO2 emissions

Ultra-high Performance Fiber Reinforced Concrete (UHPFRC) is a material characterized by its high strength and durability, offering a promising alternative to reduce the consumption of natural resources and extend the service life of structures. Its properties enable the design of lighter structural elements with reduced cross-sections. Thus, the main objective of this study is to minimize the consumption of raw materials required to meet regulatory demands for stiffness, ductility, and strength while also contributing to the reduction of CO 2 emissions associated with structures. In this context, the study proposes alternatives to mitigate these emissions compared to conventional reinforced concrete, adopting UHPFRC as a strategy for structural element dematerialization—that is, reducing cross-sections without compromising mechanical performance. The methodology includes analytical and numerical calculations through computational modeling in Abaqus® software, considering conventional concrete and UHPFRC beams previously subjected to experimental tests. The goal is to identify more efficient and sustainable solutions by comparatively analyzing CO 2 emissions in beams with equivalent load-bearing capacities. The study focuses on emissions from the production phase, which represent the main source of environmental impact throughout the UHPFRC life cycle. The results indicate that if this material presents equal or lower emissions in this phase, its high durability properties will provide even greater advantages in the long term, in the use and end-of-life phases, compared to conventional concrete. In the comparison carried out, the UHPFRC beam demonstrated a 3.1% reduction in emissions in this first phase, highlighting its potential to contribute to the decarbonization of the construction industry and expand the use of this material. Finally, the findings of this study are expected to support scientific and technological advancements, promoting a deeper understanding of the mechanical behavior of innovative and sustainable materials.