Abstract
In this work, the mechanical properties of hybrid fiber-reinforced cementitious composites (CP-ECCs) composed of polypropylene fibers (PPs) with varying volume fractions and 1% volume fraction chopped carbon fibers (CFs), as well as the influence of different fly ash (FA) contents on material performance under both room temperature (20 °C) and high-temperature conditions, are systematically studied. Through experiments conducted at five target temperatures (20, 200, 400, 600, and 800 °C), the residual mechanical properties, fundamental mechanical properties, and microstructural evolution patterns of the CP-ECC were analyzed. The results indicated that the mechanical properties of the material generally tended to increase with increasing temperature, reaching peak strength at 600 °C, followed by a significant decrease at 800 °C. Scanning electron microscopy (SEM) analysis revealed that the incorporation of PP fibers effectively suppressed cracking and spalling in concrete at 600 °C. Moreover, the carbon fiber-like reinforcement structure formed by the CF fibers and molten PP fibers further enhanced the mechanical properties of the ECCs at elevated temperatures. This study innovatively designed a novel high-temperature resistant hybrid fiber ECC material. This material provides a new theoretical foundation for the application of ECCs in high-temperature environments, with significant theoretical value and practical significance.
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Acknowledgements
ThanksThis study was funded by the Research Grant from the Jilin Provincial Department of Science and Technology, China (Project No. 20240304120SF). The authors sincerely thank Professor Hao Jiang and Professor Yunlong Zhang for their technical assistance during the experiments, which significantly improved the manuscript.We also extend our gratitude to the anonymous reviewers for their constructive feedback and to the editorial team of Scientific Reports for their guidance throughout the submission process. Furthermore, we acknowledge Ao Zhang for their valuable academic advice. Finally, we express our heartfelt appreciation to our families for their unwavering support and encouragement during this research.
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This research was financially supported by the Department of Science and Technology of Jilin Province for study design, data collection, and manuscript preparation (No. 20240304120SF).
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Cui, J., Jiang, H., Zhang, Y. et al. Research on the residual mechanical properties of hybrid fiber ECCs after high-temperature exposure. Sci Rep (2026). https://doi.org/10.1038/s41598-026-49804-5
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DOI: https://doi.org/10.1038/s41598-026-49804-5
