Estudo da corrosão no compósito cimentício autoadensável com substituição do agregado miúdo por resíduo de vidro

Abstract

Concrete is one of the most used materials in civil construction and many types of waste can be used in its composition to reduce the extraction of natural raw materials, such as glass, which is a 100% recyclable material and can be used in various granulometries. In concrete structures over time, manifestations such as pathological or interference of the reinforcement may appear, which is an action of pathologies and interference that significantly damages steel bars and concrete through the environment combined or not with mechanical exercises. Thus, this work aims to evaluate the production of self-compacting cementitious composite with ground glass waste, in the proportions of 0% (no glass waste) 5%, 10%, 15%, 20% and 30% in place of the fine aggregate and investigate the influence on reinforcement corrosion. Thus, this work aims to evaluate the production of self-compacting cementitious composite with ground glass waste, in the proportions of 0% (no glass waste) 5%, 10%, 15%, 20% and 30% in place of the fine aggregate and investigate the influence on reinforcement corrosion. For that, it was used for the characterization of the glass residue the tests of granulometry, water absorption, specific mass, unit mass and composition by SEM/EDS. In the fresh state, the “Mini-Cone Slump Flow” and “mini v-funnel test” methods were used. In the hardened state, tests of mechanical strength to axial compression, indirect tensile strength (diametral compression), specific mass, porosity, and to evaluate the corrosion behavior through the volumetric electrical resistivity method, chloride ion diffusion test and corrosion test were performed. electrochemical impedance spectroscopy. The results were satisfactory for the use of RMV as a partial replacement of the fine aggregate of the CAA. In fresh assays, the results were within the ranges adopted by the authors. Increasing substitution of waste glass in place of sand resulted in a decrease in plastic viscosity, increased flow time and less deformity. The mechanical properties have been improved, and it can even be used for structural purposes. In the tests on the occurrence of corrosion, the specimens characterized the risk as negligible, low and very low of corrosion in the self-compacting mortar.