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Article

Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers

1
Faculty of Civil Engineering, Architecture and Geodesy, University of Split, Matice Hrvatske 15, 21000 Split, Croatia
2
Komjate d.o.o., Put Kruga 9, 21212 Kaštel Sućurac, Croatia
3
Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
*
Author to whom correspondence should be addressed.
Academic Editors: Baljinder Kandola and Francesco Tornabene
J. Compos. Sci. 2021, 5(10), 265; https://doi.org/10.3390/jcs5100265
Received: 31 August 2021 / Revised: 19 September 2021 / Accepted: 27 September 2021 / Published: 11 October 2021
(This article belongs to the Special Issue Fire Safety of Structural Composites)
In this study, we conducted an initial investigation of the post-fire mechanical properties of concrete reinforced with Spanish broom fibers. The mechanical properties were determined at room temperature, and the post-fire mechanical properties were determined at elevated temperature, so that the fire resistance of the concrete could be determined. Five mixtures were considered: three with differently treated Spanish broom fibers, a polypropylene fiber mixture, and a reference concrete mixture. The concrete and reinforced concrete samples were first dried to 100 °C, then heated to 400 °C, and left to cool to room temperature. The samples were tested immediately and 96 h after cooling. The compressive strength, weight loss, ultrasonic pulse velocity, and dynamic modulus of elasticity were determined and compared. The cross-sectional images of the concrete samples captured through an optical microscope were observed and analyzed. The changes in fiber structure were monitored by TG/DTG analysis. The results of the study indicate that even the reference concrete mixture did not have satisfactory residual properties. The reinforced concretes did not improve the residual properties of the reference concrete, but reduced the spalling and explosive failure performance under a compressive load. The concrete reinforced with Spanish broom fibers showed improved residual properties compared with concrete reinforced with polypropylene fibers. View Full-Text
Keywords: concrete; Spanish broom fibers; fire resistance; residual properties; cooling time; thermogravimetry–differential thermal analysis concrete; Spanish broom fibers; fire resistance; residual properties; cooling time; thermogravimetry–differential thermal analysis
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MDPI and ACS Style

Juradin, S.; Vranješ, L.K.; Jozić, D.; Boko, I. Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers. J. Compos. Sci. 2021, 5, 265. https://doi.org/10.3390/jcs5100265

AMA Style

Juradin S, Vranješ LK, Jozić D, Boko I. Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers. Journal of Composites Science. 2021; 5(10):265. https://doi.org/10.3390/jcs5100265

Chicago/Turabian Style

Juradin, Sandra, Lidia Karla Vranješ, Dražan Jozić, and Ivica Boko. 2021. "Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers" Journal of Composites Science 5, no. 10: 265. https://doi.org/10.3390/jcs5100265

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