Sustainability Assessments of Hot and Warm Mix Asphalt Paving Technologies

This research provides a comprehensive environmental and economic analysis of both Hot Mix Asphalt (HMA) and Warm Mix Asphalt (WMA) technologies for the purpose of consolidating sustainable pavement solutions. The potential necessity of preventing global warming and minimizing the production cost of standard asphalt production has sparked an urgent need to seek alternatives, leading to WMA as a viable and eco-friendly solution. The temperature in the production process has a great difference between HMA and WMA. The operating temperature of HMA is 150 to 180 °C, whereas WMA works at lower temperatures, like 110 to 140 °C. This drop in temperature has significant environmental advantages, such as reduced levels of greenhouse gas emissions, reduced consumption of fuel, and increased worker safety because of less fume exposure. According to economic evaluations, there are energy savings of between 20% and 75% and reported production cost reductions of at most $1.61 per ton.WMA permits higher recycling materials like Reclaimed Asphalt Pavement (RAP), steel slag, glass fiber, and jute fiber, consistent with the goals of the 4Rs (Reduce, Reuse, Recycle, and Reclaim) of the sustainable philosophy. These composite mixtures have shown improvements in fatigue resistance, moisture susceptibility, and rutting performance. However, WMA technologies present an inferior performance at high traffic levels, particularly concerning early-life durability and moisture sensitivity, because of lower compaction temperature. The application of bio-based WMA additives from waste sources would provide opportunities to overcome these shortcomings. Environmental governance of WMA over HMA is facilitated through Life Cycle Assessment analyses (LCA) that have used commercial (Athena) software, particularly concerning energy utilization and carbon dioxide and greenhouse gas (GHG) emissions. According to this research, WMA is a cost-effective, viable, and performance-responsive alternative to traditional asphalt paving methods.