IRAQI JOURNAL OF CIVIL ENGINEERING (2021) 015–002 Iraqi Journal of Civil Engineering Available online at https://www.iasj.net/ Journal homepage: https://www.iasj.net/iasj?func=issues&jId=141&uiLanguage=en * Corresponding author. Tel.: +964 783 081 6982. E-mail address: ame19e1010@uoanbar.edu.iq. Flow ability and Mechanical Properties of Shotcrete concrete incorporated with Waste Plastic Fibers Amer M. Enad *1 , Abdulkader I. Al-Hadithi 1 , Yousif A. Mansoor 1 1 Civil Engineering Department, College of Engineering, University of Anbar, Ramadi, Iraq A R T I C L E I N F O Article history: Received 21 /06 / 2021 Received in revised form 20 /07 / 2021 Accepted 30 /07 / 2021 Available online 27 /12 / 2021 Keywords: Shotcrete Flowability Properties Mechanical Properties WPF Fiber reinforced shotcrete A B S T R A C T Polyethylene terephthalate (PET) fiber is a green-friendly fiber that is capable of enhancing the mechanical properties of wet-mixing shotcrete. The main purpose of this study is to see how varied volumes of waste plastic fibers (WPF) affect the flowability and mechanical properties of wet-mix shotcrete. For this aim, a variety of experimental tests based on WPF content were chosen. Fresh and mechanical tests included slump, T500, density, compressive strength, and splitting strength were applied. The results shown a improved in shotcrete performance as the WPF content increased. Among all fitting correlations, density and compressive strength revealed the strongest linear ship association. Due to greater interlocking between WPF and concrete matrix, WPF was a major use in enhancing splitting tensile strength. WPF had the most influence on splitting strength, with 23–31 percent, 7–23 percent, and 6–38 percent for 7, 14, and 28-day, respectively. 1. Introduction Shotcrete is commonly used for the repair and rehabilitation of structures. It is widely employed for the protection of soil and rock slopes. Conventionally, to control shrinkage cracking of the shotcrete layer, steel meshes are placed before shotcreting is carried out. A more effective technique, however, is to incorporate short fibers into the shotcrete mix. With large surface area per volume, fibers are very effective for crack control. Also, by removing the procedure of steel mesh laying, construction efficiency is improved (Qiao & Zhou, 2017). Since the early 1970s, fibers have been utilized to strengthen shotcrete. Due to the fact that normal concrete is nearly identical to shotcrete except for the application, fiber reinforced shotcrete gained popularity pretty rapidly. Fiber reinforced shotcrete (FRS) is defined as "mortar or concrete containing discontinuous discrete fibers that is pneumatically projected onto a surface at a high velocity." Shotcrete is made of steel, glass, and synthetic fibers, with steel being the most common. The addition of WPF to concrete mixtures may improve their mechanical properties (Gagnon & Jolin, 2017). Cheng et al. demonstrated the construction of a sustainable lightweight wet-mix shotcrete by substituting a type of byproduct for natural coarse gravel (walnut). To improve the performance of the lightweight wet-mix shotcrete, fibers derived from dumped polyethylene terephthalate