2026-05-30T06:21:21Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/111582025-12-18T01:05:38Zcom_10259_3969com_10259_5086com_10259_2604col_10259_3970

Mena Alonso, Álvaro Aragón Torre, Ángel Vicente Cabrera, Miguel Ángel González Cabrera, Dorys Carmen Mínguez Algarra, Jesús 2025-12-17T10:26:29Z 2025-12-17T10:26:29Z 2025-12 2214-5095 https://hdl.handle.net/10259/11158 10.1016/j.cscm.2025.e05654 This study investigates the scatter in fatigue life (N) of fiber-reinforced concrete (FRC) as a function of variability in local fiber orientation and content. To this end, three FRC series were produced with fiber contents of 0.3 %, 0.6 %, and 1.0 %. All specimens were scanned using micro-computed tomography (microCT) and subsequently tested under flexural fatigue. The results show a clear correlation between fiber orientation and fatigue strength: within each series, specimens with a higher orientation factor ηX (which quantifies the degree of fiber alignment along the longitudinal axis) withstood a greater number of cycles to failure. A strong relationship was also identified between the number of fibers crossing the central section (Nfib,c) and fatigue life. Moreover, ηX and Nfib,c were found not to be independent variables, as a higher number of fibers is associated with better orientation. Finally, a model is proposed to estimate fatigue life as a function of ηX and fiber dosage, which shows adequate accuracy in predicting the scatter in N for sets of identical specimens. The authors gratefully acknowledge the financial support provided by the Spanish Ministerio de Ciencia, Innovaci´ on y Universidades through project PID2023–147971OB-C33, and by the Junta de Castilla y Le´on (Regional Government) through project BU004G24. Open access funding provided by UNIVERSIDAD DE BURGOS. application/pdf eng Elsevier Case Studies in Construction Materials. 2025, V. 23, e05654 https://doi.org/10.1016/j.cscm.2025.e05654 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Steel-fiber-reinforced concrete Fatigue life Fiber orientation Microcomputed tomography Statistical variability Materiales de construcción Ingeniería civil Hormigón Building materials Civil engineering Concrete Role of local fiber content and orientation on the scatter of flexural fatigue behavior in steel fiber-reinforced concrete info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Case Studies in Construction Materials 23 e05654