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Advances in Materials Science and Engineering
Volume 2016, Article ID 1638419, 7 pages
http://dx.doi.org/10.1155/2016/1638419
Research Article

Mechanical Properties of High Volume Fly Ash Concrete Reinforced with Hybrid Fibers

School of Engineering, RMIT University, Melbourne, VIC, Australia

Received 19 June 2016; Revised 10 October 2016; Accepted 9 November 2016

Academic Editor: Kazunori Fujikake

Copyright © 2016 Rooban Chakravarthy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fly ash substitution to cement is a well-recognized approach to reduce CO2 emissions. Although fly ash concrete is prone to brittle behavior, researchers have shown that addition of fibers could reduce brittle behavior. Previous research efforts seem to have utlised a single type of fiber or two types of fibers. In this research, three types of fibers, steel, polypropylene, and basalt as 0%, 0.50%, 0.75%, and 1% by volume of concrete, were mixed in varying proportions with concrete specimens substituted with 50% fly ash (class F). All specimens were tested for compressive strength, indirect tensile strength, and flexural strength over a period of 3 to 56 days of curing. Test results showed that significant improvement in mechanical properties could be obtained by a particular hybrid fiber reinforcement combination (1% steel fiber, 0.75% polypropylene fiber, and 0.75% basalt fiber). The strength values were observed to exceed previous research results. Workability of concrete was affected when the fiber combination exceeded 3%. Thus a limiting value for adding fibers and the combination to achieve maximum strengths have been identified in this research.