Bond-slip response of steel fibers after exposure to elevated temperatures: Experimental program and design-oriented constitutive equation. (1st January 2021)

• Record Type: Journal Article
• Authors: Serafini, Ramoel; Agra, Ronney Rodrigues; Bitencourt, Luís A.G.; de la Fuente, Albert; de Figueiredo, Antonio D.
• Is Part Of: Composite structures. Volume 255(2021)
• Publication Date: 2021-01-01
• Subjects: Pullout -- Bond-slip response -- Hooked-end steel fibers -- Elevated temperatures -- Numerical simulation; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2020.112916
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: This study aimed to evaluate the effect of elevated temperatures on the bond-slip behavior of hooked-end steel fibers. A total of 180 pullout specimens were tested in post-cooling conditions using a double-sided pullout test with multiple embedded fibers for target temperatures between 25 and 750 °C. Results proved that the bond strength significantly increases for temperatures up to 450 °C, and drastically decreases for temperatures of 600 and 750 °C. The contribution of hooks reduced with temperature and is negligible for temperatures higher than 600 °C, while the fiber-matrix frictional interaction seems to improve for all temperatures evaluated. A temperature-sensitive constitutive equation that allows simulating the bond-slip behavior of hooked-end steel fibers is proposed and its suitability confirmed through a numerical model.