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- Thermal properties of electrical arc furnace slag based materials obtained by accelerated carbonationPublication . Cristino, Luciana Sucupira; Gomes, João Paulo de CastroReducing dependence on fossil fuels and harnessing renewable energy are imperative to facing the current climate emergency and mitigating problems related to pollutants. This thesis focuses on the analysis of the microstructure and thermal properties of mortars manufactured with 100% electric arc furnace slag (EAF-slag) for passive solar energy capture, aiming to contribute to sustainable energy solutions. The first phase involved a comprehensive review of recent civil engineering research on solar thermal energy storage, highlighting the potential of energy harvesting devices. In addition, it delved deeper into the investigation of accelerated carbonation materials used both in research environments and in the construction sector. The subsequent step evaluated the thermal capacity of the EAF-slag through differential scanning calorimetry (DSC). The results indicated that the EAF-slag binders exhibited consistent and minimal changes in heat flux responses at various temperature rates, contrasting with the irregular and more significant variations observed in the Portland cement-based binders. The DSC results emphasized the potential of EAF-slag in developing materials with thermal properties. The third stage analyzed the thermal properties, microstructure and compressive strength of 100% EAF-slag mortars, with and without biochar. The incorporation of biochar led to a reduction in the thermal conductivity of the specimens. However, all EAF-slag specimens obtained results that surpass conventional Portland cement specimens in thermal conductivity. EAF-slag mortars demonstrated favorable thermal properties in all tests carried out. The thermal expansion of EAF-slag mortars was slightly more than twice that of Portland cement (PC) mortars. The EAF-slag mortar sample maintained a higher temperature than the PC mortar sample. The material with particle size composition ranging from 1 mm to 2 mm and 100% EAF slag without biochar showed the most promising results of all tests of passive solar energy utilization in the construction industry. These findings highlight a potential for 100% EAF-slag materials in passive solar thermal applications. Their superior thermal conductivity, substantial thermal capacitance, gradual heat absorption and heat release characteristics, and resilience to the effects of thermal energy position them as materials that perform well in maintaining mechanical stability even under extreme summer conditions. This research highlights the feasibility of 100% EAF-slag carbonated materials for construction, offering a sustainable solution that mitigates the environmental impacts associated with waste and conventional passive solar thermal energy storage. This study represents an advancement toward innovative and sustainable practices in civil engineering and construction. The analyzed material can be applied to facades, roofs, and pavements in areas with high solar exposure and elevated temperatures.