DEVELOPMENT OF SELF-CLEANING PERMEABLE GEOPOLYMER PAVEMENT

Reference Presenter Authors
(Institution)
Abstract
17-012 Marcelo Strozi Cilla Cilla, M.S.(Federal University of Bahia); Since geopolymers can be used as a substitute for Ordinary Portland Cement (OPC) and/or ceramic components in various applications, it is possible to develop permeable geopolymer blocks as pervious pavement. For environmental reasons, alternatives have been sought to replace OPC with alternative materials, which represent a reduction both in CO2 emissions and in energy expense for its production. Unlike impermeable concrete pavement, permeable concrete pavement provides better rain-drainage under severe weather conditions. Additionally, porous structure in permeable pavement can preliminarily purify the rain and serve as tunnels for atmosphere-pavement heat and moisture exchange, leading to positive environmental effects. Given its high permeability, water is rapidly absorbed, providing safer circulation, reducing flood risks. In addition, it minimizes the urban impact on water cycles by providing a natural recharge stream of groundwater in urban environments. Furthermore, permeable geopolymer pavement could be a solution that proves to be quite effective for the drainage of rainwater in streets, surface parking and sidewalks, minimizing costs and long-term maintenance. Thus, the present work has the objective of evaluating the performance of geopolymer permeable pavement produced with alkali-activated metakaolin and granite rock waste with additions of 7.5 and 15.0 wt.% of unreacted ore waste (UOW) from the production of TiO2, to promote the Advanced Oxidative Process (AOP) aiming to degrade air pollutants. For this purpose, mechanical characterization, as well as porosity, water absorption and permeability, besides degradation tests of organic compound (methylene blue) and gases by photocatalysis were performed. The results obtained evidenced the feasibility to produce geopolymer permeable pavement with addition of UOW promoting a photocatalytic effect.