Abstract
The paper summarizes selected results of an extensive experimental investigation, in which high-strength strain-hardening cement-based composites (HS-SHCC) made with different high-performance polymer fibers were investigated in terms of mechanical behavior under and after exposure to elevated temperatures of 105 °C, 150 °C and 200 °C. Besides the ultra-high molecular-weight polyethylene (UHMWPE) fibers, which are commonly used in HS-SHCC, high-modulus poly(p-phenylene-2,6-benzobisoxazole) (PBO-HM) fibers have been analyzed, since they exhibit a considerably higher temperature resistance in comparison to UHMWPE fibers. In contrast to the expectations, the in-situ and residual tension experiments at temperatures of up to 150 °C showed that the high-strength SHCC reinforced with UHMWPE fibers yielded considerably superior performance and less pronounced decrease of the mechanical properties compared to the composites made with PBO-HM fibers. Furthermore, the SHCC made with UHMWPE fibers showed a significant recovery after being cooled down, while the SHCC made with PBO-HM fibers exhibited a limited recovery; the degradation was proportional to the temperature increase. The 200 °C treatment led to brittle failure of both composites with dramatically reduced tensile strength and with low recovery after specimen cooling in the residual experiments.
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Acknowledgements
The authors express their gratitude to the German Research Foundation (Deutsche Forschungsgemeinschaft - DFG) for the financial support within the Research Training Group GRK 2250 “Mineral-bonded composites for enhanced structural impact safety”. Furthermore, the authors express their acknowledgement to Mr. Syed Fasih Mohiuddin, Mr. Kai Uwe Mehlisch, and Mr. Tilo Günzel for their valuable support in preparing and performing the experimental investigations. Credit is given to the Institute of Timber Structures of the Technische Universität Dresden for providing the stereo DIC system.
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Curosu, I., Burk, S., Liebscher, M., Mechtcherine, V. (2021). Influence of Fiber Type on the Tensile Behavior of High-Strength Strain-Hardening Cement-Based Composites (HS-SHCC) During and After Exposure to Elevated Temperatures. In: Serna, P., Llano-Torre, A., Martí-Vargas, J.R., Navarro-Gregori, J. (eds) Fibre Reinforced Concrete: Improvements and Innovations. BEFIB 2020. RILEM Bookseries, vol 30. Springer, Cham. https://doi.org/10.1007/978-3-030-58482-5_90
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DOI: https://doi.org/10.1007/978-3-030-58482-5_90
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