Desempenho do concreto permeável após entupimento induzido e técnicas de manutenção

Abstract

The excessive growth of urban centers enhances soil sealing, which is responsible for the occurrence of floods, causing contamination of public supply sources. To mitigate this problem, it will be essential to find mechanisms that provide harmony between development demands and sustainability aspects, with a focus on environmental, economic and health issues. Among the available alternatives is permeable concrete, which is a device that aims to recover the draining ability of the surface. Due to having a large amount of voids, the permeable concrete pavement is fragile to the phenomenon of clogging, raising doubts about the extension of its useful life. In this context, the need arises to implement viable maintenance methodologies, which have the capacity to significantly restore the element's original performance. Seeking to contribute to the resolution of the problem, the present research aims to verify the performance variation of permeable concrete when subjected to the phenomenon of clogging, in addition to proposing satisfactory techniques for cleaning the pavement. Firstly, four permeable concrete plates (45x45x20 cm) were made, exposed to different clogging/maintenance scenarios, and the infiltration rate test was carried out on them. Sequentially, four cylindrical specimens (10x20 cm) were extracted from each of the manufactured plates, which served to perform the density, porosity, permeability and compressive strength tests. Regarding the results obtained, it was evident that the phenomenon of clogging impairs the functionality and durability of permeable concrete, considering that its incidence caused a sharp decrease in the infiltration capacity of the structure. However, it was found that the suggested maintenance methods are capable of mitigating the impacts caused by the process of pore obstruction, achieving greater efficiency with the cleaning procedure with a jet of compressed air. Keywords: Pervious concrete; Clogging phenomenon; Maintenance.