Abdullah Al Jaberi, Abdullah Nabil (2023) Performance of hybrid fiber reinforced concrete containing polypropylene and ring-shaped polyethylene terephthalate fibers. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Polypropylene (PP) and recycled polyethylene terephthalate (PET) fiber as structurally sound materials have been adopted by many researchers to improve the properties of concrete especially tensile strength and crack resistance. However, the irregular shape and straight fibers of PP and PET exhibited weak interfacial bond strength during fiber bridging. Therefore, ring-shaped polyethylene terephthalate (RPET) fibers were developed with straight PP fiber as a combination fiber to improve the fiber bridging mechanism of the fiber reinforced concrete. This study aims to determine the slump and passing flow of fresh concrete, the density, compressive and tensile strength, and water absorption of hardened concrete containing PP and RPET fiber. A total number of 144 cube and 48 cylinder specimens of hybrid fiber reinforced concrete (HFRC) with 0 %, 0.5 %, 1.0 %, and 1.5 % of each PP and RPET fiber content, respectively, were prepared and tested to evaluate the properties of the hardened fiber reinforced concrete. Then statistical optimization using Design-Expert software was performed to determine the optimum percentage of PP and RPET fiber content for the hybrid fiber reinforced concrete. For the hybrid fiber reinforced concrete, the maximum slump flow was achieved with 1.5% of RPET fiber and 0 % of PP fiber content, and the minimum slump flow was recorded with 1.50 % of each RPET and PP fiber content. Furthermore, the highest passing flow index was obtained with 0.5 % of each PP and RPET fiber content, and the minimum passing flow index was achieved with 1.50 % of each RPET and PP fiber content. On the other hand, the density of the hybrid fiber reinforced concrete was increased with increasing RPET fiber content and decreasing PP fiber content. Meanwhile, the maximum compressive and tensile strengths were recorded at 1.0 % of each PP and RPET fiber content, respectively compared to other specimens. Finally, it was noticed that increasing PP and RPET fiber content increases the water absorption percentages gradually. In conclusion, the properties of fresh concrete containing hybrid fibers were decreased, while the mechanical properties of hardened were improved compared to the control specimen

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