Influência do uso de resíduo de vidro no concreto contaminado por íons cloreto, íons sulfato e CO2.

Abstract

Concrete structures have their performance directly related to the conservation of mechanical properties and properties linked to durability. Regarding durability, it is possible to mention the action of three agents that can influence the reduction of life, such as Chloride ions that compromise the load capacity of reinforced concrete through corrosion of reinforcement; Sulfate ions considered the most aggressive chemical agents and may be found diluted in underground water; and carbon dioxide (CO2) that is able to penetrate the pores acting as a Ph reducing agent initiating a carbonation process. An important solution to mitigate the ingress of these aggressive agents into concrete structures is the use of well-dosed traces composed of Portland cement and pozzolans, which are able to interact with cement compounds improving their performance. In this context, research and projects in construction have used glass waste as an alternative to fine aggregate and as an addition, which favors the sustainable disposal of the waste and reduction of the consumption of other materials, when used in partial replacement. In this research, the results obtained with the use of glass residue showed that the material used does not act as a mitigator against chemical attacks, but does not act as a factor that facilitates the penetration of the attacks. Given the above, this research aims to analyze the influence of the use of glass waste from bottles used in Fernando de Noronha Island, used in concrete as partial replacement of fine aggregate in the percentages of 0%, 15% and 30%, which were subjected to the tests of: Penetration of chloride ions through drying and partial immersion cycles, Penetration of chloride ions based on ASTM C 1202/2017 Passing charge, Accelerated induction of sulfate ion penetration by full immersion and Acceleration Carbonation in a CO2 chamber. For fresh concrete, the specific mass test was performed, while in the hardened state, the concrete was submitted to the compressive strength tests.