Self-compacting concrete (SCC) plays a critical role in civil construction due to its ability to enhance productivity, improve on-site working conditions, and promote sustainability. Its distinguishing characteristic lies in the fresh-state properties, such as high flowability, controlled consistency, and resistance to segregation, which are essential for its overall performance. This study aimed to validate the behavior of a beam made with self-compacting microconcrete through numerical modeling using Ansys software. The Finite Element Method (FEM) was employed for numerical analysis to compare experimental results with the simulation outcomes. In the experimental phase, concrete mixture with 40% sand replacement by ornamental stone waste was evaluated. The microconcretes produced met the rheological criteria necessary for classification as self-compacting. Among the mixtures, the one incorporating 20% stone waste exhibited the best packing density, resulting in superior strength and durability. The numerical modeling, using three-dimensional finite elements, showed a convergence rate of 90% between the experimental values and the simulated results. This indicates a satisfactory validation of the experimental findings, with stress, deformation, and failure modes closely resembling those observed experimentally. The study demonstrates the effectiveness of this repair methodology for structural applications, confirming its potential for practical use in enhancing structural integrity.