2026-04-17T14:46:05Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4263822026-03-25T10:51:20Zcom_2072_1033col_2072_452950

Experimental and theoretical analysis of auxetic cementitious composite: a comparative study with recycled and virgin steel fibers Valverde Burneo, David Enrique García Troncoso, Natividad Segura Pérez, Ignacio García Laborda, Manuel Enrique Santillán Alarcón, Ninel Estefanía Sánchez Calderón, Luis Alberto Franco Quiñonez, Valeria Universitat Politècnica de Catalunya. Doctorat en Enginyeria de la Construcció Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental Universitat Politècnica de Catalunya. EC - Enginyeria de la Construcció Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó Auxetic cementitious composite Recycled steel fibers Energy dissipation materials This research investigated the development of auxetic cementitious composites (ACC) reinforced with recycled steel fibers (ranging from 0 % to 2 % volume in increments of 0,5 %). The mechanical and auxetic properties of these composites were compared to an ACC reinforced with virgin steel fibers. Additionally, a theoretical model was developed to understand stress-strain behavior, specific energy absorption, and their corresponding measured errors. This novel material has the potential to significantly impact global infrastructure resilience, offering solutions for seismic protection, impact absorption, and collision mitigation. Additive manufacturing techniques were employed to produce the ACCs. The study utilized an Ultra-High Performance Concrete (UHPC) formulation tailored for both high strength and workability. The ACCs underwent mechanical testing and physical characterization, including measurements of Poisson's ratio. The results revealed that ACCs reinforced with recycled steel fibers achieved the desired properties, comparable to those of the virgin fiber-reinforced ones. Notably, Poisson's ratio reached -1,12, signifying pronounced auxetic behavior. This implies that under longitudinal compression, the specimen would contract in the transverse direction by up to 112 % of its vertical strain, exceeding the typical strain recoveries (15–30 %) of conventional construction materials like concrete and steel. Furthermore, the specific deformation energy absorption of the auxetic specimen reached 0,92 J/cm^3. This research successfully developed and characterized auxetic cementitious composites using recycled steel fibers, contributing to the material's sustainability and offering a promising solution for global challenges in infrastructure resilience and energy efficiency. Peer Reviewed Postprint (author's final draft) 2025-05 Article Valverde, D. [et al.]. Experimental and theoretical analysis of auxetic cementitious composite: a comparative study with recycled and virgin steel fibers. "Journal of building engineering", Maig 2025, vol. 101, núm. article 111822. 2352-7102 https://hdl.handle.net/2117/426382 10.1016/j.jobe.2025.111822 eng https://www.sciencedirect.com/science/article/abs/pii/S2352710225000580 http://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access Attribution-NonCommercial-NoDerivatives 4.0 International application/pdf Elsevier