RT info:eu-repo/semantics/article
T1 Improving the performance of recycled concrete by biodeposition of biogenic silica as a surface coating
A1 Merino Maldonado, Daniel
A1 Antolín Rodríguez, Andrea
A1 Blanco Lanza, Saúl
A1 Morán del Pozo, Julia María
A1 García González, Julia
A1 Juan Valdés, Andrés
A2 Ingenieria Agroforestal
K1 Ingeniería agrícola
K1 Surface treatment
K1 Durability
K1 Biodeposition
K1 Diatoms
K1 Biogenic silica
K1 Construction and demolition waste (CDW)
K1 Recycled concrete
AB [EN] This study addresses the challenges of sustainability and the implementation of a circular economy in the construction and maintenance of concrete structures used in clean-water applications. Specifically, it examines the use of an innovative surface treatment based on a biofilm comprising diatom biosilica deposition as a waterproofing agent and surface pore sealant to improve the longevity of recycled concrete. To this end biofilm-treated and untreated (control) samples of a concrete mix containing 50% recycled aggregates were subject to four performance tests directed at assessing the durability of concrete structures under environmental conditions: resistance to carbonation, freeze–thaw durability, resistance to water penetration, and electrical resistivity as an indicator of the corrosion resistance of concrete. In addition, the protective biofilm was characterised using SEM. Results suggest that the biogenic silica surface treatment significantly improves the durability of recycled concrete, in particular, for treated compared to untreated samples there was a 56 % reduction of the carbonation front, 26% lower mass loss in freeze–thaw cycles, 57% reduction in the water penetration front under pressure, and 44% higher electrical resistivity. Together these findings confirm that the biofilm used in this study constitutes an effective treatment to improve the properties of recycled concrete and ensure its durability, particularly when used in the construction of structures in contact with constant water fluctuations.
PB Elsevier
SN 0950-0618
LK https://hdl.handle.net/10612/17325
UL https://hdl.handle.net/10612/17325
NO Merino-Maldonado, D., Antolín-Rodríguez, A., Blanco, S., Ma Morán-del Pozo, J., García-González, J., & Juan-Valdés, A. (2023). Improving the performance of recycled concrete by biodeposition of biogenic silica as a surface coating. Construction and Building Materials, 408(133781), 133781. https://doi.org/10.1016/j.conbuildmat.2023.133781
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 09-jun-2024