2026-06-17T21:58:24Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/112052026-01-14T01:05:46Zcom_10259_11203com_10259_5086com_10259_2604col_10259_11204

Alonso Díez, Álvaro Arroyo Sanz, Raquel Serna Avendaño, Sara Nevshupa, Roman Calderón Carpintero, Verónica 2026-01-13T11:35:26Z 2026-01-13T11:35:26Z 2025-12 2214-5095 https://hdl.handle.net/10259/11205 10.1016/j.cscm.2025.e05292 To reduce the use of natural resources and promote a circular economy in the construction sector, this study investigates the valorization of polyurethane, polyester, and fiberglass-based roofing waste from the automotive industry as a partial replacement for natural fine aggregates in cement-based mortar paving blocks. Paving elements were manufactured with replacement levels of 20 %, 40 %, and 60 % by volume and tested for mechanical, physical, and durability properties in related standards. The results show that all mixtures met the minimum splitting tensile strength requirement of 3.60 MPa, with 40 % replacement achieving a peak improvement of 9.3 % compared to the reference. The density decreased by up to 300 kg/m³ , improving handling and reducing transportation impacts, whereas wear resistance, slip resistance, and fire resistance remained within permissible limits. Durability tests, including salt crystallization, freeze–thaw cycles, and outdoor exposure, confirmed the suitability of the materials for exterior paving applications. This research demonstrates that PU-based roofing waste can replace up to 60 % of natural fine aggregates in paving block production without compromising performance, offering a technically viable and environmentally beneficial alternative for sustainable urban infrastructure. The authors gratefully acknowledge the financial support of the BU070P20 Project funded by the Fondo Europeo de Desarrollo Regional (FEDER) and the Junta de Castilla y León (Spain). This work was also supported by the Regional Government of Castilla y León (Junta de Castilla y León), the Ministry of Science and Innovation MCINN, and the European Union NextGenerationEU/PRTR. application/pdf eng Elsevier Case Studies in Construction Materials. 2025, V. 23, p. e05292 https://doi.org/10.1016/j.cscm.2025.e05292 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Cobblestone Mortar Polyurethane waste Circular economy Durability Materiales de construcción Resistencia de materiales Ingeniería civil Building materials Strength of materials Civil engineering Sustainable paving solutions: Physical and outdoor behavior of cement cobblestones with industrial polymer roof waste aggregates info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Case Studies in Construction Materials 23 e05292