Abstract
Numerous environmental issues arise as a result of a linear economy strategy: reserves become scarce and end up in landfills and as greenhouse gases. Utilizing waste as a resource or shifting towards a circular economy are among the effective strategies for addressing these issues. To track this shift, appropriate measures that concentrate on sustainable development while taking practical contexts into consideration are required. In this paper, we utilize plastic wastes as a replacement for bitumen for reuse aiming at a circular economy. The use of plastic waste materials, i.e., plastic bottles (PET) and gas pipes (PE) in asphalt materials as a bitumen modifier was studied through series of experimental lab test methods. Marshall samples were prepared using a conventional Marshall method containing five different percentages (0%, 5%, 10%, 15%, and 20%) of plastic content by total weight of bitumen. Samples were tested after 1 and 30 days and the result shows that the stability of plastic-modified asphalt concrete was increased after 30 days, while still meeting standard criteria with plastic contents up to 20%. Moreover, the addition of waste plastic in road construction is a very effective strategy for reusing plastic waste, which also provides economic and social benefits for a sustainable approach to road pavements.
Highlights
Plastics are one of the present world’s largest innovations and widely used materials worldwide
One of most popular ways to improve the performance of an asphalt mixture is to modify it with polymer [12,13]
The physical performance of plastic-modified bitumen was analyzed by a penetration test, softening point, fire point and ductility tests as per standard specification
Summary
Plastics are one of the present world’s largest innovations and widely used materials worldwide. Asphalt mixtures have increasingly become an important material for roadway and airport pavement structures [7,8,9]. Modified asphalt has played a vital role in reducing pavement-related issues by enhancing thermo–physical characteristics, which have an impact on the mixture’s final performance [11]. One of most popular ways to improve the performance of an asphalt mixture is to modify it with polymer [12,13]. Can be used to increase rutting resistance in asphalt mix design [14]. PET size of 1.18 mm showed a negative impact on rutting resistance and durability of the asphalt mixes when used as a modifier, as well as lower binder properties [23].
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