2026-04-19T06:37:55Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/105162025-06-05T00:06:03Zcom_10259_6171com_10259_5086com_10259_2604col_10259_6172

Evaluation of the durability of structural concrete with low contents of Raw-Crushed Wind Turbine Blade Hurtado Alonso, Nerea Bravo Díez, Pedro Miguel de Brito, Jorge Revilla Cuesta, Víctor Skaf Revenga, Marta Raw-crushed wind-turbine blades (RCWTB) Concrete Durability Thermal conductivity Shrinkage Environmental impact Materiales de construcción Hormigón-Ensayos Building materials Concrete-Testing The raw crushing of wind turbine blades that have reached the end of their service life has led to the emergence of a waste material known as Raw-Crushed Wind Turbine Blade (RCWTB). Its heterogeneous composition primarily consists of fibres of glass fibre-reinforced polymer (GFRP), polymeric and balsa wood particles. This study explores the incorporation of RCWTB at low contents in concrete mixes, with a focus on its effects on durability. To this end, four concrete mixes were prepared with RCWTB contents of 0 %, 0.5 %, 1.25 %, and 2.5 %. After fresh-state and strength characterization, the mixes were evaluated for water absorption, chloride penetration resistance, carbonation resistance, thermal conductivity and shrinkage. In terms of slump and compressive strength, the incorporation of RCWTB resulted in moderate reductions in both properties. Nonetheless, all mixes reached 28-day strength values widely exceeding 30 MPa, meeting structural performance criteria. Water absorption, chloride penetration, and carbonation depth increased with RCWTB content due to the presence of porous particles within RCWTB, reaching a maximum at 1.25 % RCWTB, then stabilizing for 2.5 % RCWTB. Conversely, thermal conductivity decreased with RCWTB content due to the low-density particles of balsa wood, also stabilizing beyond 1.25 % RCWTB. All these properties followed a logarithmic evolution with the RCWTB content. Finally, the stiffness provided by GFRP fibres when incorporating 1.25 % and 2.5 % of RCWTB slightly reduced concrete shrinkage. These durability findings allow identifying potential fields of application of concrete containing low RCWTB amounts, such as façade cladding elements, interior beams and columns of buildings, or pavements. This research work was supported by the Spanish Ministry of Universities, MICIU, AEI, EU, ERDF and NextGenerationEU/PRTR [grant numbers PID2023–146642OB-I00; 10.13039/501100011033; TED2021–129715B-I00]; the Junta de Castilla y Leon ´ (Regional Government) and ERDF [grant number UIC-231; BU033P23; BU066–22]; and the University of Burgos [grant number SUCONS, Y135.GI]. The authors also acknowledge the support of the Foundation for Science and Technology, through funding UIDB/04625/2020, CERIS Research Centre and Instituto Superior T´ecnico. Open access funding provided by University of Burgos. 2025-06-04T12:45:48Z 2025-06-04T12:45:48Z 2025-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0950-0618 http://hdl.handle.net/10259/10516 10.1016/j.conbuildmat.2025.141900 eng Construction and Building Materials. 2025, V. 485, p. 141900 https://doi.org/10.1016/j.conbuildmat.2025.141900 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier