DESENVOLVIMENTO DE CONCRETO DE ULTRA ALTO DESEMPENHO COM INCORPORAÇÃO DE REJEITOS DE MINERAÇÃO E FIBRAS METÁLICAS

Abstract

This study investigates the development and properties of Ultra-High Performance Concrete (UHPC) with sand incorporation from mining tailings, seeking to combine high structural performance with sustainability in civil construction. The first chapter presents a systematic literature review that analyzes the state of the art of UHPC, highlighting the fundamental role of mineral additions and metallic fibers in optimizing the compactness of the matrix and ductility of the material. The second chapter details the experimental methodology and the materials used, focusing on the substitution of conventional fine aggregates with mining tailings, aiming to mitigate the environmental impacts of natural sand extraction and reduce production costs. The literature review suggests that the use of mining tailings is technically feasible, and there is a gap to be explored. The results indicate that the mechanical properties remain superior, with a compressive strength above 120 MPa, a dense matrix, and a refined ITZ as shown by SEM. When metallic fibers are incorporated, they combine high fracture energy, toughness, and tensile strength, which are fundamental for applications in critical infrastructure.