RT Journal Article
T1 Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes
A1 Caneda-Martínez, Laura
A1 Monasterio, Manuel
A1 Moreno-Juez, Jaime
A1 Martínez-Ramírez, Sagrario
A1 García, Rosario
A1 Frías, Moisés
AB This work analyses the influence of fine concrete fractions (<5 mm) of different natures—calcareous (HcG) and siliceous (HsT)—obtained from construction and demolition waste (C&DW)on the behaviour of blended cement pastes with partial replacements between 5 and 10%. The twoC&DW fractions were characterised by different instrumental techniques. Subsequently, their limefixingcapacity and the physico-mechanical properties of the blended cement pastes were analysed.Lastly, the environmental benefits of reusing these fine wastes in the manufacture of future ecoefficientcement pastes were examined. The results show that HsT and HcG exhibit weak pozzolanicactivity, owing to their low reactive silica and alumina content. Despite this, the new cement pastesmeet the physical and mechanical requirements of the existing regulations for common cements. Itshould be highlighted that the blended cement pastes initially showed a coarser pore network, butthen they underwent a refinement process between 2 and 28 days, along with a gain in compressivestrength, possibly due to the double pozzolanic and filler effect of the wastes. The environmentalviability of the blended cements was evaluated in a Life Cycle Assessment (LCA) concluding that theoverall environmental impact could be reduced in the same proportion of the replacement rate. Thisis in line with the Circular Economy goals and the 2030 Agenda for Sustainable Development.
PB Multidisciplinary Digital Publishing Institute (MDPI)
YR 2021
FD 2021-03-08
LK http://hdl.handle.net/11556/1101
UL http://hdl.handle.net/11556/1101
LA eng
NO Caneda-Martínez, Laura, Manuel Monasterio, Jaime Moreno-Juez, Sagrario Martínez-Ramírez, Rosario García, and Moisés Frías. “Behaviour and Properties of Eco-Cement Pastes Elaborated with Recycled Concrete Powder from Construction and Demolition Wastes.” Materials 14, no. 5 (March 8, 2021): 1299. doi:10.3390/ma14051299.
NO This research was funded by the Spanish Ministry of Science, Innovation and Un iversities (MICIU), the Spanish National Research Agency (AEI) and the European Regional Development Fund (ERDF), grant number RTI2018-097074- B-C21-22, as well as by the Spanish Training Program and the European Social Fund (MINECO/FSE) [grant number BES-2016-078454].
DS TECNALIA Publications
RD 3 jul 2024