Comparison of Performance Properties and Prediction of Regular and Gamma-Irradiated Granular Waste Polyethylene Terephthalate Modified Asphalt Mixtures

Abstract

The utilization of waste polyethylene terephthalate (WPET) as aggregate substitutes in pavement has been extensively promoted because of its environmental advantages. However, previous studies have shown that a high percentage of WPET reduces the performance of the pavement. To increase the durability of pavement and mitigate the environmental issues caused by WPET, WPET is treated with gamma-irradiation as a component in asphalt mixtures. The study objectives were to investigate the feasibility of using WPET granules as a sustainable aggregate on asphalt mixture stiffness and rutting and predict the asphalt mixture performance containing irradiated WPET via an RSM-ANN-framework. To achieve the objectives, stiffness and rutting tests were conducted to evaluate the WPET modified mixtures’ performance. The result indicated that samples containing 40% irradiated WPET provided a better performance compared to mixtures containing 20% non-irradiated WPET, increasing the stiffness by 27% and 21% at 25 °C and 40 °C, respectively, and rutting resistance by 11% at 45 °C. Furthermore, both predictive models developed demonstrated excellent reliability. The ANN exhibited superior performance than the RSM. The utilization of WPET as aggregate in asphalt mixtures represents a way to addressing related recycling issues while also improving performance. With gamma-irradiation treatment, the utilization of WPET can be increased with improved asphalt mixture performance.

Taguchi method and Box-Behnken design approach for process parameter optimization of magnetite (Fe3O4) coating developed on stainless steel 410 grade by hot alkaline treatment

“…Moreover, the adequate precision value shows the S/N ratio, which is >4, is desirable. 48 The standard deviation, mean, and coefficient of variation (CV) are 0.2226, 10.57, and 2.11%. The CV value (2.11%) denotes the better precision, credibility, and minor errors of the experiments conducted.…”

Effects of Metal Waste Strips on Strength Characteristics of Road Base Material

“…The use of waste from various materials, such as iron, aluminum, and others to strengthen the road has several benefits from an economic viewpoint [12,13]. Utilization of various types of waste is an efficient way to address recycling issues while simultaneously improving the performance of the pavement system [14]. When the layers of the road are strengthened, they last for a longer period than usual without the need for continuous maintenance, meaning that the durability of the pavement significantly increases [15,16].…”

Evaluating the Effect of Asphalt Binder and Bio-Geopolymer Composite on the Permanent Deformation Resistance of Asphalt Concrete via Response Surface Method

“…As a result, optimizing the materials used in the modification process, as well as building prediction models for asphalt concrete PDR, is required. In this case, mathematical modeling, and optimization methods such as response surface methodology (RSM) can be effective for analysis and optimization [7,8]. The use of statistical modeling and optimization methods, such as the response surface method, is extremely advantageous in measuring the impact of asphalt binder and biochar geopolymer composites (BGC) on the permanent deformation resistance of asphalt concrete [7].…”