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.
Keywords
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
DOI: https://dx.doi.org/10.21741/9781945291838-72
The article was published as article 72 of the book Non-Conventional Materials and Technologies
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