Due to worldwide awareness of the need for environmental preservation, considerable weight has been given to developing technologies and methods that promote sustainability, underscoring studies on recycling urban solid waste such as sewage sludge ash (SSA) as a source of raw materials for this industry. Following this tendency, the present study aimed at assessing the technical implications of using SSA as an addition in the preparation of Portland cement concrete on the workability, axial compressive strength, void ratio and water absorption properties of samples produced with 0%, 5%, 10% and 15% of waste in relation to mass of sand used. The results of this study showed that up to 10% of SSA could be added to the concrete mixtures without compromising axial compressive strength, void ratio and water absorption. Moreover, it was found that using this waste induced a loss of workability in the concretes produced.
Abstract-The present study verifies the possibility of incorporating sewage sludge in the production of ceramic mass for ceramic roof tiles. Domestic sewage sludge and clay from ceramic industries of the northeast region of Brazil were used. The raw materials were chemically and mineralogically characterized. Seven hundred and fifty tiles were manufactured using different concentrations of sludge (2%, 4%, 6%, 8% and 10% of sludge dry mass). The high amount of organic material (71%) from the sludge shows itself as being main factor on affecting the quality of roof tiles. The increased dosage of sludge implies a linear tendency of increased absorption and decreased load rupture on flexion. Results have shown the possibility of using nearly 4% of sludge (dry matter) on ceramic mass to manufacture roof tiles with no interference in its final product properties, in compliance with current international standards.
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