MESII - 2023

Permanent URI for this collectionhttp://192.248.9.226/handle/123/21214

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Browsing MESII - 2023 by Author "Guluwita, SP"

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    item: Conference-Abstract
    Suitability of extracting aluminium from aluminium sludge waste
    (Department of Materials Science and Engineering, University of Moratuwa., 2023-07-28) Hemapriya, ATS; Ekanayake, EMSM; Guluwita, SP; Sivahar, V
    This research aims to explore an innovative and sustainable approach for extracting aluminium from aluminium sludge waste, thereby transforming it into a valuable resource. The study proposes a comprehensive methodology involving a combination of physical, chemical, and electrochemical techniques to maximize aluminium recovery. Since there are two steps; purification of alumina and electrolyzing, this paper has discussed both steps. The steps in purification process; leaching, precipitation have been analyzed considering parameters such as concentrations of leachants, pH value, stirring time, temperature of bath. Purified samples were analyzed using FTIR, EDEX methods. Electrolyzing process of alumina has performed using CaCl2-NaCl electrolyte and analyzed the extraction of metallic aluminium by analyzing products of electrolyzation using XRD, SEM results.
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    item: Conference-Abstract
    Suitability of using al sludge waste to produce paving block
    (Department of Materials Science and Engineering, University of Moratuwa., 2023-07-28) Wijethunga, KHDL; Liyanage, DPLNM; Guluwita, SP; Sivahar, V
    Aluminum sludge is a by-product of water treatment plants that use aluminum salts as a primary coagulant. Researchers examine the influence of dry aluminum sludge as a partial Portland cement type I replacement on the mechanical properties of high-performance concrete (HPC). The alum sludge was introduced at various weight percentages concerning cement and fine aggregate 0%, 3%, 5%, 7%, 10%, and 15%. The results revealed that the compressive strength of the concrete rapidly decreased as the amount of cement replaced with AS increased. Subsequently, Superplasticizers were used for more performance. This content was varied (2%, 3%, 4%, 5%, and 6% by wt% of cement). It was found that the concrete with 5% AS and 2% superplasticizers cement replacement demonstrated improved compressive strength and splitting tensile strength at all ages, compared with the control concrete. Ultimately identified the optimal level required for the paving block to comply with standards and be cost-effective.