Abstract
ABSTRACT: The sewage treatment stations (STSs), located in Teresina-PI, were designed to receive domestic sewage, however, in 2011 they began to receive unknown sewer from clean pit vehicles. This sewage is compromising the effluent treatment efficiency. The permeable concrete with the addition of titanium dioxide (TiO 2 ) presents itself as an alternative process to assist in the treatment of sanitary sewage due to its photocatalytic properties. Therefore, the objective of this work was to evaluate the mechanical, hydraulic, and microstructural properties of permeable concrete with the addition of 3, 6 and 10% of TiO 2 . The results determined that the variation in the concentration of TiO 2 significantly influenced the properties analyzed in this research. The addition of TiO 2 to the permeable concrete to a concentration of 6% impairs its physical and hydraulic properties and improves its mechanical properties.
Highlights
The disorderly growth of society, associated with the processes of degradation of water quality, has been creating serious problems of quantitative and qualitative water scarcity, in addition to conflicts of use, even in natural regions with excess water
This indicated that the increase in the granulometry of coarse aggregates, with a lower water-cement ratio, offered more resistance to compaction, which decreased the specific mass and increased the porosity, which according to Ibrahim et al [24], as the ratio cement-aggregate increases, the volume of intergranular void decreases due to the decrease in the resistance to compaction offered by the reduced amount of aggregates, which was evidenced by the tests performed
The mixtures that had in their composition varied granulometry (PC.0.25.B0, permeable concrete (PC).0.30.B0 and PC.0.35.B0), presented the highest specific masses because the voids generated by the aggregates with larger particle sizes (12.5 mm), it may have been sufficient to accommodate the smaller aggregates (4.75 and 2.36 mm), resulting in a greater compaction factor, which had already been verified by Ibrahim et al [24] where the values of specific mass, obtained in different water-cement ratios, are functions of the compaction method and the degree of lubrication of the sample
Summary
The disorderly growth of society, associated with the processes of degradation of water quality, has been creating serious problems of quantitative and qualitative water scarcity, in addition to conflicts of use, even in natural regions with excess water. Industrial and domestic activities release many aggressive agents in the air, water, and soil, generating consequences that society needs to resolve. The residues produced in generally contain toxic pollutants and.
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