Analysis of the influence of multi-source waste-based additives on the manufacturing of warm temperature bituminous mixtures
DOI:
https://doi.org/10.3989/mc.2025.374724Keywords:
Asphalt mixtures, additives, Indirect foaming, Waste by-products, Warm mix asphaltAbstract
Growing environmental awareness of the depletion of finite natural resources (gas, fuel, etc.) and the continuous rise in greenhouse gas emissions (NOx, CO, CO2, etc.) has driven the road engineering industry to develop technologies for producing asphalt mixes at lower temperatures than traditional hot mix asphalt (HMA). Warm mix asphalts (WMAs) offer a viable alternative to conventional mixes, maintaining both mechanical performance and durability while providing a positive ecological impact. This paper presents an investigative study aimed at analyzing the reuse of waste by-products in the production of WMAs at 140°C. To achieve this, three different waste materials (a zeolite by-product from the petrochemical industry, charred acacia splinters, and charred plastic) were characterized and analyzed as additives for the indirect foaming of WMA. Their mechanical performance was then compared to a reference HMA. The results showed that the zeolite by-product exhibited similar workability and compaction to traditional HMA produced at 160°C, while also demonstrating comparable stiffness modulus, resistance to plastic deformation, and water resistance.
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