RT Journal Article
T1 Eco-Friendly Pavements Manufactured from Mixed Recycled Aggregates Obtained from Construction and Demolition Waste: An Industrial-Scale Validation
A1 Contreras Llanes, Manuel
A1 Gázquez González, Manuel Jesús
A1 Romero, Maximina
AB This study aimed to validate that laboratory-scale results could be commercially replicated when manufacturing marketable precast concrete. Construction and demolition waste (CDW) was separated into two (fine and coarse) recycled aggregates (RAs). Precast paver and kerb units were fabricated by partial or total substitution of natural aggregates (NAs) by RAs. The study involved the comprehensive characterisation of raw materials, including particle size distribution, mineral composition, and elemental composition. Paver blocks and kerbs manufactured with up to 50% RAs showed mechanical resistance (T = 3.7 ± 0.2 and B = 5.3 ± 0.6 MPa, respectively), water absorption between 5.3–5.7%, and abrasion resistance (approximately 20.2 mm), which met the standard requirements (UNE-EN 1340:2004 and UNE-EN 1338:2004). Furthermore, industrial-scale precast pavement units demonstrated strength and durability suitable for heavy traffic areas. A reduction of 13% in cement content could maintain the requirements with a partial RA substitution of 25%, offering economic and environmental benefits. Therefore, it is feasible at an industrial level to replace NAs with RAs, promoting durability and technological properties with a positive environmental impact and considerably reducing CO2 emissions by up to 65%. Overall, pavers with RAs manufactured at the laboratory scale met mechanical standards, and the kerb stones showed improvements in abrasion resistance. On an industrial scale, kerb stones and precast blocks with specific substitutions can meet strength, water absorption, and abrasion requirements, allowing a reduction in cement content.
PB MDPI
SN 1996-1944 (electrónico)
YR 2023
FD 2023
LK https://hdl.handle.net/10272/23252
UL https://hdl.handle.net/10272/23252
LA eng
NO Contreras-Llanes, M., Gázquez, M. J., & Romero, M. (2023). Eco-Friendly Pavements Manufactured from Mixed Recycled Aggregates Obtained from Construction and Demolition Waste: An Industrial-Scale Validation. In Materials (Vol. 16, Issue 24, p. 7544). MDPI AG. https://doi.org/10.3390/ma16247544
NO This research was funded by the Centre for the Development of Industrial Technology(CDTI) to the Spanish Ministry of Economy, Industry, and Competitiveness (MINECO), by theproject “Eco-efficient concrete urban paving from mixed recycled aggregates obtained from CDW”(Ref.: IDI-20180931) and by the Spanish Ministry of Science, Innovation and Universities’ ResearchAgency “Valorisation of the wastes coming from the process for removing natural radionuclides inphosphogypsum leachates” (Ref.: PID2020-116461RA-C22).
DS Repositorio Institucional de la Universidad de Huelva
RD 14 jul 2026