Performance-Related Characterization of Fluidized Thermal Backfills Containing Recycled Components
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ORIGINAL PAPER
Performance-Related Characterization of Fluidized Thermal Backfills Containing Recycled Components Eldho Choorackal1 · Pier Paolo Riviera1 · Davide Dalmazzo1 · Ezio Santagata1 · Lorena Zichella1 · Paola Marini1 Received: 16 November 2018 / Accepted: 11 March 2019 © Springer Nature B.V. 2019
Abstract The investigation described in this paper focused on the performance-related characterization of cementitious Fluidized Thermal Backfills (FTBs) containing recycled components derived from pavement maintenance and aggregate or stone processing operations. In particular, the study was performed with the purpose of assessing the suitability of these peculiar mixes in situations which require the filling of cavities in the presence of several conduits with high-voltage transmission cables. FTBs were prepared in the laboratory by modifying their standard composition in order to include variable percentages of reclaimed asphalt pavement (RAP) and of three different types of mineral sludge. Components were subjected to preliminary physical characterization and the sludges were investigated in detail with the purpose of identifying their microstructure and chemical composition. In consideration of their intended end-use, FTBs were characterized in terms of their flowability, thermal conductivity and thermal stability. Furthermore, while considering a typical layout of high-voltage cables, an analysis was carried out in order to quantitatively assess the influence of FTB composition and characteristics on line ampacity. Results showed that FTBs may be successfully designed to include recycled components while still retaining satisfactory flow characteristics and thermal properties, although it should be considered that they are extremely sensitive to variations in composition. Furthermore, it was proven that the considered FTBs all led to a satisfactory line ampacity and that in fact their formulation may be adjusted to improve the durability of high-voltage cables. Keywords Fluidized Thermal Backfill · Reclaimed asphalt pavement · Mineral sludge · Flowability · Thermal conductivity · Ampacity
Statement of Novelty The findings illustrated in this paper are extremely relevant in the context of waste management since they prove that the use of reclaimed asphalt pavement (RAP) and mineral sludge in Fluidized Thermal Backfills (FTBs) constitutes a valuable alternative to landfilling, with the corresponding valorization of waste materials that are usually available in significant amounts. It should be underlined that no similar studies were found in the technical literature on fluid cementitious composites. It is envisioned that the obtained results may be of value for the design and production of FTBs with other recycled components, provided that a similar * Eldho Choorackal [email protected] 1
Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Turin, Italy
assessment is carried out with respect to the most important performan
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