Comprehensive evaluation of impact strength and microstructural characteristics of geopolymer concrete reinforced with four types of natural fibers of varying lengths
Bazarkhankyzy A. Murali G. Aibuldinov Y. Iskakova Z. Kurpińska M. Abdelgader H.S. Avudaiappan S. Dixit S.
December 2025Nature Research
Scientific Reports
2025#15Issue 1
This study systematically studied the impact strength of Geopolymer concrete (GC) integrating fly ash, slag, and silica fume, reinforced with four natural fibers including sisal, jute, coir, and flax at varying aspect ratios. The primary objectives are to analyze the influence of fiber length on initial cracking number (J1), failure number (J2), crack-bridging mechanisms, and failure modes under impact loading. This study presents a unique contribution by thoroughly examining the impact of fiber aspect ratio in multi-binder GC, offering critical insights into optimizing fibrous GC for improved structural performance and resilience. The impact performance of GC was influenced by both fiber type and length. Coir fibers enhanced J1 by up to 66% and J2 by 171.43%, with optimal energy absorption at 60 mm. Flax and jute fibers showed peak performance at 40 mm, with J2 improvements of 75.82% and 100%, respectively, while longer lengths led to dispersion issues and diminished gains. Sisal fiber at 40 mm offered balanced enhancement (J1: 50%, J2: 117.58%), whereas the highest J2 (135.16%) was achieved with 60 mm, accompanied by a moderate drop in J1, indicating that excessive fiber lengths may hinder bonding efficiency.
Fibers , Flax , Geopolymer concrete , Impact strength , Jute , Microstructure , Sisal. coir
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Research Institute of New Chemical Technologies, L.N. Gumilyov Eurasian National University, Satpayev str., 2, Astana, 010000, Kazakhstan
Department of Chemistry, Faculty of Natural Sciences, L.N. Gumilyov Eurasian National University, Satpayev str., 2, Astana, 010000, Kazakhstan
Centre for Promotion of Research, Graphic Era (Deemed to be University), Clement town, Dehradun, India
K. Kulazhanov Kazakh University of Technology and Business, Kaiym Mukhamedkhanov str, 37 A, Astana, 010000, Kazakhstan
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdańsk, Poland
Faculty of Engineering, Civil Engineering Department, University of Tripoli, Tripoli, Libya
Departamento de Ciencias de la Construcción, Facultad de ciencias de la construccion y ordenamiento territorial, Universidad Tecnológica Metropolitana, Santiago, Chile
Centre for Research Impact and Outcome, Chitkara University Institute of Engineering and Technology, Chitkara University, Punjab, Rajpura, 140401, India
Research Institute of New Chemical Technologies
Department of Chemistry
Centre for Promotion of Research
K. Kulazhanov Kazakh University of Technology and Business
Faculty of Civil and Environmental Engineering
Faculty of Engineering
Departamento de Ciencias de la Construcción
Centre for Research Impact and Outcome
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