Tensile Property Changes in Polyvinyl Alcohol Fiber-Reinforced Engineered Cementitious Composites at Sub-Elevated Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 2
Abstract
As a high-performance composite material, polyvinyl alcohol (PVA) fiber-reinforced engineered cementitious composites (PVA-ECCs) are often used in sub-elevated temperature environments (<) for long-term service. However, the effect of exposure time in sub-elevated temperature on the performance of PVA-ECCs is not still clear. In this study, the properties of PVA-ECCs in sub-elevated temperature environments were examined, with emphasis on the effect of exposure time (1, 3, 6, and 9 h). Furthermore, the microstructure and tensile behavior of single PVA fibers exposed to a sub-elevated temperature environment was investigated. Results showed that PVA-ECCs have enhanced tensile ductility at different sub-elevated temperature exposure times below 100°C. However, the tensile properties of PVA-ECCs at 150°C showed a strain retraction phenomenon at 6 and 9 h. The strain-hardening characteristics of PVA-ECCs gradually disappeared with the increase of the sub-elevated temperature exposure time at 200°C. The results of thermogravimetric-differential scanning calorimetry (TG-DSC), Fourier transformation infrared spectroscopy (FTIR), and scanning electron microscope (SEM) revealed that the degradation of PVA fibers was accelerated by exposure time in sub-elevated temperature, which caused the reduction of mechanical properties of PVA-ECCs.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51968056), the Science and Technology Project of Inner Mongolia (Grant Nos. 2022YFHH0153 and 2019CG072), the Basic Research Funds for Universities in Inner Mongolia (Grant Nos. JY20220207 and JY20220047), and Scientific Research Project of Inner Mongolia University of Technology (Grant Nos. ZZ202003 and BS2021048).
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 2 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 7, 2022
Accepted: Aug 4, 2023
Published online: Nov 27, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 27, 2024
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