2026-03-092026-03-092025-11-04SANTOS, Laíse dos. Influência do preparo de superfície na resistência ao cisalhamento na interface entre concretos em reparos estruturais. Orientadora: Luciana de Nazaré Cordeiro Pinheiro. 2026. 26f. Trabalho de Curso (Bacharelado em Engenharia Civil) – Faculdade de Engenharia Civil, Instituto de Tecnologia, Universidade Federal do Pará, Belém, 2025. Disponível em: . Acesso em:.https://bdm.ufpa.br/handle/prefix/9302Concrete is a historically and widely used material, with numerous research projects focused on improving its properties such as strength, rheology, and durability. However, it is equally relevant to study maintenance and repair strategies for existing structures, since concrete, although an artificial rock, is also subject to the effects of time and weather. Among the available techniques, structural repair by adding new layers of concrete stands out, the efficiency of which depends directly on the adhesion between old and new concrete. This work investigated the influence of different surface preparations on the adhesion between concretes molded at different ages. Twenty-eight cubic specimens of 30 MPa were prepared, joined to three types of base preparation: chipping, sanding, and grooving. The evaluation was performed by shear tests at the interface between the concretes using a push-out test. The results indicate significant differences in performance according to the type of preparation, with chipping showing the best performance, averaging 6.26 MPa of strength. The second best result was from systems with grooved surfaces, with an average resistance of 5.6 MPa, demonstrating that surface roughness plays a fundamental role in improving shear strength and the quality of adhesion between new and old concrete.Acesso AbertoCisalhamentoAderênciaPreparo de baseReforço estruturalConcretoShearAdhesionBase preparationStructural reinforcementconcreteCNPQ::ENGENHARIAS::ENGENHARIA CIVIL::CONSTRUCAO CIVIL::MATERIAIS E COMPONENTES DE CONSTRUCAOTrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil