Mechanical properties of high strength concrete reinforced with metallic and non-metallic fibres |
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| Affiliation: | 1. Construction Material Institute (CMI), University of Tehran, Tehran, Iran;2. Zachry Department of Civil Engineering, Texas A&M University, TX, United States;3. Amirkabir University of Technology, Tehran, Iran;4. Construction Materials Institute (CMI), Department of Civil Engineering, University of Tehran, Tehran, Iran;1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore;2. Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano, Italy;3. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA;1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300350, China;2. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China;1. Jamilus Research Center (JRC), Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja 86400, Johor, Malaysia;2. Micropollutant Research Centre (MPRC), Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja 86400, Johor, Malaysia |
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| Abstract: | This paper focuses on the experimental investigation carried out on high strength concrete reinforced with hybrid fibres (combination of hooked steel and a non-metallic fibre) up to a volume fraction of 0.5%. The mechanical properties, namely, compressive strength, split tensile strength, flexural strength and flexural toughness were studied for concrete prepared using different hybrid fibre combinations – steel–polypropylene, steel–polyester and steel–glass. The flexural properties were studied using four point bending tests on beam specimens as per Japanese Concrete Institute (JCI) recommendations. Fibre addition was seen to enhance the pre-peak as well as post-peak region of the load–deflection curve, causing an increase in flexural strength and toughness, respectively. Addition of steel fibres generally contributed towards the energy absorbing mechanism (bridging action) whereas, the non-metallic fibres resulted in delaying the formation of micro-cracks. Compared to other hybrid fibre reinforced concretes, the flexural toughness of steel–polypropylene hybrid fibre concretes was comparable to steel fibre concrete. Increased fibre availability in the hybrid fibre systems (due to the lower densities of non-metallic fibres), in addition to the ability of non-metallic fibres to bridge smaller micro cracks, are suggested as the reasons for the enhancement in mechanical properties. |
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