Effect of Fiber Types and Elevated Temperatures on the Bond Characteristic of Fiber Reinforced Concretes

Authors: Erdoğan Özbay, Hakan T. Türker, Müzeyyen Balçıkanlı, Mohamed Lachemi

Abstract:

In this paper, the effects of fiber types and elevated temperatures on compressive strength, modulus of rapture and the bond characteristics of fiber reinforced concretes (FRC) are presented. By using the three different types of fibers (steel fiber-SF, polypropylene-PPF and polyvinyl alcohol-PVA), FRC specimens were produced and exposed to elevated temperatures up to 800 ºC for 1.5 hours. In addition, a plain concrete (without fiber) was produced and used as a control. Test results obtained showed that the steel fiber reinforced concrete (SFRC) had the highest compressive strength, modulus of rapture and bond stress values at room temperatures, the residual bond, flexural and compressive strengths of both FRC and plain concrete dropped sharply after exposure to high temperatures. The results also indicated that the reduction of bond, flexural and compressive strengths with increasing the exposed temperature was relatively less for SFRC than for plain, and FRC with PPF and PVA.

Keywords: Bond stress, Compressive strength, Elevated temperatures, Fiber reinforced concrete, Modulus of rapture.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1100665

References:

[1] L. Biolzi, S. Cattaneo, and G. Rosati, “Evaluating residual properties of thermally damaged concrete,” Cement & Concrete Composites, 30, 907– 916, 2008.
[2] H. L. Malhotra, “The effect of temperature on the compressive strength of concrete,” Magazine of Concrete Research, 8(22), 85–94, 1956.
[3] U. Schneider, “Concrete at high temperatures – a general review,” Fire Safety Journal, 13(1), 55–68, 1988.
[4] L. T. Phan, and N. J. Carino, “Review of mechanical properties of HSC at elevated temperature,” Journal of Materials in Civil Engineering, 10(1), 58–64, 1998.
[5] C. Castillo, and A. J. Durrani, “Effect of transient high temperature on high strength concrete,” ACI Materials Journal, 87(1), 47–53, 1990.
[6] I. Janotka, and S. C. Mojumdar, “Thermal analysis at the evaluation of concrete damage by high temperatures,” Journal of Thermal Analysis and Calorimetry, 81(1), 197–203, 2005.
[7] J. P. C. Rodrigues, L. Laim, and A. M. Correia, “Behaviour of fiber reinforced concrete columns in fire,” Composite Structures, 92, 1263– 1268, 2010.
[8] P. Kalifa, G. Chéné, and C. Gallé, “High-temperature behaviour of HPC with polypropylene fibers from spalling to microstructure,” Cement and Concrete Research, 31(10), 1487–99, 2001.
[9] A. Lau, and M. Anson, “Effect of high temperatures on high performance steel fiber reinforced concrete,” Cement and Concrete Research, 36, 1698–1707, 2006.
[10] M. Haskett, D. J. Oehlers, and M. S. M. Ali, “Local and global bond characteristics of steel reinforcing bars,” Engineering Structures, 30, 376–383, 2008.
[11] S. Cattaneo, and G. Rosati, “Bond between Steel and Self-Consolidating Concrete: Experiments and Modeling,” ACI Structural Journal, vol. 106, No. 4, 540-550, July-August 2009.
[12] R. H. Haddad, R. J. Al-Saleh, and N.M. Al-Akhras, “Effect of elevated temperature on bond between steel reinforcement and fiber reinforced concrete,” Fire Safety Journal, 43 334–343, 2008.
[13] E. Ozbay, F. Cassagnebere, and M. Lachemi, “Effects of fiber types on the fresh and rheological properties of self-compacting concretes,” SCC2010 conference, 26-30 September, Montreal, Canada, 2010.