Adeleke University Journal of Engineering and Technology [AUJET] Vol. 6, No 1, 151 - 159 (2023) www.aujet.adelekeuniversity.edu.ng 151 ISSN: 2714 - 2450 Performance Investigation of Combined Waste Polymer Modified Hot Bitumen Mix Salami, L. O. 1* , Kareem M. A. 2 , Tijani M. A. 2 , Ameen I. O. 2 and Bello, A. A. 2 1 Department of Civil Engineering, Adeleke University, Ede, Nigeria 2 Department of Civil Engineering, Osun State University, Osogbo, Nigeria *Corresponding Author E-mail: salami.lukman@adelekeuniversity.edu.ng *Phone Number: +2348032266705 A R T I C L E I N F O A B S T R A C T Received: March / 2023 Revised: May / 2023 Accepted: June / 2023 Published: June / 2023 Inadequate performance of hot bitumen mix necessitates the adoption of waste polymer for bitumen modification. Increment in waste polymer generation can be attributed to an increment in global urbanization and industrialization. This study investigated the performance of hot bitumen mix modified with Combined Waste Polymer (CWP) of melted WPB and WWS. A 60/70 penetration grade of bitumen was weighed into ten separate containers prior to heating to produce Hot Bitumen Mix (HBM) which were unmodified samples. The HBM samples were modified with CWP at a proportion of 0 - 18% @ 2% intervals. Penetration (P), Softening Point (SP), Ductility (D), Specific Gravity (SG), Loss on Heating (LOH), Flash and Fire Point (FFP) were evaluated on the unmodified and modified HBM samples. The obtained values of P, SP, D, SG, LOH and FFP were 33 – 70 mm, 55 – 78°C, 101 – 112 cm, 1.01 – 1.11, 0.14 – 0.23% and 263 – 353°C for HBM samples. Modification of hot bitumen mix with the combination of waste plastic bottle and waste water sachet are suitable for enhancement of hot bitumen mix performances. Efforts should be integrated by Government toward preparing and implementing a sustainable solid waste management plan. Keywords: Hot bitumen mix, Combined waste polymer, Waste plastic bottle, Waste water sachet, Waste Management. 1. INTRODUCTION Global urbanization and industrialization have increased the rate at which waste is generated. The incessant production of refuse from industrial byproducts poses environmental difficulties in terms of their management and discarding. In Nigeria, waste polymers are widely used for portable water and beverages packaging. Waste polymers are ubiquitous in modern culture, and they make up 7 to 14% by weight of the municipal waste produced in Nigeria (Babatunde et al., 2013 and Benjamin et al., 2014). In a similar vein, studies conducted by Appiah et al. (2017), It was discovered that waste polymers account for 12.7% of all produced debris. Polymer is a not biodegradable, and scientists have shown that it can remain on the planet for 4,500 years without degrading (Babatunde et al., 2013; Dahunsi et al., 2013; Awaeed et al., 2015; Ajagbe et al., 2018; Akinleye et al., 2020a; 2020b). The main problem of polymer is that without special treatment, it is not readily biodegradable and thus accumulates. The polymer concern can be addressed through reduction, reuse, and recycling. Burning or burying waste polymers is not sustainable or environmentally beneficial because the process releases smoke, carbon dioxide, carbon monoxide, and nitrous oxide, which are significant contributors to global warming and methane (Appiah et al., 2017). Ajagbe et al. (2018); Akinleye et al., 2020a; 2020b studied the effect of waste polymer enhanced hot bitumen mix and concluded that as the Waste Plastic Bottles (WPB) increased; there was a corresponding increase in the softening point value, which shows an enhancement in resistance due to deformation and penetration value also decreases which indicate an improvement in shear resistance.