The growing global energy demand requires solutions that improve energy efficiency in all sectors. The civil construction sector is responsible for a large part of global energy consumption. In this context, phase change materials (PCMs) can be incorporated into construction materials to improve the energy efficiency of buildings. The purpose of this study was to incorporate a PCM to jute fabric, applying it in civil construction as a reinforcement for cement matrices. In order to do that, a method of immersing jute fabric in liquid phase change material, and then coating it with a polymer, was proposed. Treated jute fabric was then used to produce a laminated composite with a cementitious matrix. Morphological, mechanical and chemical characterization of jute textiles was performed, as well as an analysis of the composites’ mechanical and thermal behavior. The results verified that jute textiles absorbed 102% PCM in weight, which was successfully contained in the capillary porosity of jute. The PCM was able to delay the composite’s temperature increase by up to 24 °C. It was concluded that this method can be used to incorporate PCM to natural textiles, producing composites with thermal energy storage properties.

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Two bio-oleogels were investigated. These materials were produced with a combination of canola and soybean oil with 4, 6, 8, and 10% of beeswax (by weight). Sensible heat storage capacity, melting parameters, and enthalpies were investigated by the differential scanning calorimetry (DSC) test. An ordinary DSC dynamic test was performed. Cycles of heating and cooling were performed, as well as tests with different heating rates. According to the results, the materials present a melting temperature between −16 to −12 °C and a total latent heat between 22.9 and 367.6 J/g. BC10 (canola oil with 10% beeswax) was the sample with the best performance, with a latent heat of 367.6 J/g and a melting temperature of −13.6 °C, demonstrating its possible use as a phase change material for cold storage.

This research aimed to improve the impregnation of XSBR (Carboxylate Styrene Butadiene Rubber) polymer on jute yarns, and hence the mechanical properties of a TRCC (Textile-Reinforced Cementitious Composite). Thus, an experimental investigation on the use of microcrystalline and nanofibrillated cellulose as additives to XSBR admixture was carried out. Four different solutions containing XSBR are presented, and each solution-fiber interaction and each treated fiber-matrix interaction were analysed. For those interaction analyses, the influence of XSBR impregnation was evaluated via SEM (Scanning Electron Microscopy) and TGA (Thermogravimetric Analysis), while the mechanical properties of the non-treated and treated jute fibers were evaluated via direct tensile test, and the bond between the treated and non-treated jute yarn and the cementitious matrix was evaluated via pull-out tests. Results showed a prominent enhancement not only to the mechanical behavior of the treated fibers, but to the TRCC's as well. Mathematics Subject Classification (2020) MSC code1 · MSC code2 · more

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