Effect of RHA Addition on Bond Strength in Steel Fiber Reinforced Cement-Based Composites
R.C. de Souza, J.F.S. Bastos
Abstract. Steel fibers are being widely used in concretes and other cement-based composites in order to improve their toughness properties. It’s known that concrete has high compressive strength and durability, but its tensile and flexural strength is low, especially when compared to steel. Studies indicate that in cement-based composites the Interfacial Transition Zone (ITZ) is where first cracks appear and their propagation lead to material failure. Mineral additions have been incorporated into cement matrixes with two main objectives: to give a sustainable destination to agroindustrial wastes such as rice husk ash (RHA) and to improve cement-based composites properties. RHA is being produced by burning for thermal energy generation, has high amorphous silica content, which is of high potential for pozzolanic activity. Therefore, RHA is considered as a new hydration product, containing mainly the C-S-H, producing higher density to cement matrix, reducing pores and voids, besides being sustainable material, since part of cement which is highly polluting material is replaced by RHA. The main objective of this paper is to present the results of a research considering the improvement of bond between the cementitious matrix and steel fiber by partial replacing cement with RHA. For that, mortar samples were produced with RHA addition, in which steel fiber was introduced. Afterwards, pull-out tests were performed to assess adherence. As conclusion, it can be stated that RHA incorporation promoted ITZ densification, which caused an improvement in bond strength between the matrix and the steel fiber, indicating the use of that material can contribute to product more resistant steel fiber reinforced cement-based composites.
RHA, Bond Strength, Steel Fiber, ITZ
Published online , 10 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: R.C. de Souza, J.F.S. Bastos, ‘Effect of RHA Addition on Bond Strength in Steel Fiber Reinforced Cement-Based Composites’, Materials Research Proceedings, Vol. 7, pp 740-749, 2018
The article was published as article 72 of the book Non-Conventional Materials and Technologies
 JOHNSTON, C. D. Fiber-reinforced cements and concretes. New York: Taylor & Francis Group, 2001. ISBN 90-5699-694-0.
 BENTUR, A.; MINDESS, S. Fiber reinforced cementitious composites. 2. New York: Taylor & Francis Group, 2007. ISBN 978-0-415-25048-1.
 MEHTA, P. K.; MONTEIRO, P. J. M. Concrete – Microstructure, Properties and Materials. 3. United States of America: The McGraw-Hill Company, 2006. ISBN 978-0-07-146289-1.
 SOKOLOVICZ, B.; ISAIA, G.; GASTALDINI, A. Concrete with ash from natural rice husk: study of the penetration of chlorides in concrete prototypes. X Latin American Congress of Pathology and XII Congress of Quality in Construction. CONPAT 2009, 2009, Valparaiso-Chile.
 KULKARNI, M. S. et al. Effect of rice husk ash on properties of concrete. Journal of Civil Engineering and Environmental Technology, v. 1, n. 1, p. 26-29, 2014. ISSN 2349-8404.
 BATISTA, A.D. B. Effects of agroindustrial residues on mechanical strength, porosity and permeability of mortars and concretes. 2016. (Master degree). Department of Civil Engineering, CEFET-MG, Belo Horizonte / Brazil.
 GIVI, A. N. et al. Contribution of rice husk ash to the properties of mortar and concrete: a review. Journal of American Science, v. 6 (3), p. 157-165, 2010.
 LIAO, K. Y. et al. A study on the characteristics of interfacial transition zone in concrete. Cement and Concrete Research, v. 34, p. 977-989, 2004. ISSN 0008-8846.
 OLLIVIER, J. P.; MASO, J. C.; BOURDETTE, B. Interfacial transition zone in concrete. Advanced Cement Based Materials, v. 2, n. 1, p. 30-38, 1995. https://doi.org/10.1016/1065-7355(95)90037-3
 GONZÁLEZ, R. I. M. Influence of the use of rice hull ash as a mineral addition on portland cement composites reinforced by steel fibers. 2016. (Master degree). Department of Civil Engineering, CEFET-MG, Belo Horizonte / Brazil.
 RILEM-RC-6. Bond test for reinforcement steel / pull-out test: International Union of laboratories and experts in construction materials, systems and structures: 4 p. 1983.
 PINHEIRO, L. M.; MUZARDO, C. D. Adherence and anchorage. In: (Ed.). University of Sao Paulo. São Paulo: USP, 2003. cap. 10.
 NM-101. Concrete – Compression test of cylindrical specimens. Mercosur: Brazilian Association of Technical Norms: 5 p. 1996.
 ABBAS, M. Y.; KHAN, M. I. Fiber-Matrix Interfacial Behavior of Hooked-End Steel Fiber Reinforced Concrete. Journal of Materials in Civil Engineering, v. 28, n. 11, 2016. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001626