Abstract
Concrete is a widely used building material, which is good in compression, but weak in tension. The poor tension properties of concrete are covered by using steel bars as reinforcement, which enable concrete to withstand almost all types of loads and provide ductility to structural members. However, it has some drawbacks, such as controlling multi-level cracking. It is widely accepted that using the different forms of fibres together is the only way to achieve strength, ductility, and resilience to control multi-level cracking of reinforced concrete. The novelty of this study is the development of the hybrid self-compacting fibre-reinforced concrete (SCC-FRC) with polyvinyl alcohol (PVA) and polypropylene (PP) fibres to eliminate the problems associated with steel fibres. This hybrid FRC can provide better crack controlling at all stages and enhancement in mechanical properties. Out of 14 mixes, one SCC mix (without fibres) served as a control mix. The rest SCC-FRC mix contained only 2% volume fraction of PVA fibres, 2% volume fraction of monofilament PP fibres, and 2% volume fraction fibrillated PP fibres of lengths 13, 19, and 25 mm, respectively, served as the benchmark for the hybrid mixes. The remaining six SCC-FRC mixes were hybrid and consisted of 1.5 and 0.5% volume fractions of PVA and PP fibres, respectively. Out of the six mixes, three included monofilament fibres measuring 13, 19, and 25 mm in length, while the other three had fibrillated fibres measuring 13, 19, and 25 mm in length. The fresh and hardened state properties of all mixes were determined by following EFNARC and ASTM standards. The hardened properties were determined by testing the specimens in compression, split tension, flexure, and direct tension. The test results showed that PVA and PP fibres as a hybrid significantly improved strength, ductility, and crack arrest.
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Khan, S.U., Ayub, T. Mechanical Properties of Hybrid Self-Compacting Fibre-Reinforced Concrete (SCC-FRC) Containing PVA and PP Fibres. Iran J Sci Technol Trans Civ Eng 46, 2677–2695 (2022). https://doi.org/10.1007/s40996-021-00652-5
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DOI: https://doi.org/10.1007/s40996-021-00652-5