ABSTRACT

This study quantifies the potential environmental benefits associated with the incorporation of industrial by-products and recycled materials combined with warm mix asphalt (WMA) additives in wearing course mixtures for asphalt pavement construction. An electric arc furnace (EAF) steel slag-based mix and three recycled mixtures incorporating steel slag and fractionated reclaimed asphalt (RA) of varying contents (i.e. 25, 40, and 50%) were analyzed comparatively to reference hot mix asphalt (HMA) using the ‘cradle-to-gate’ approach. The results of this study indicated that the warm asphalt mixture incorporating steel slag and 50% RA is the most environmentally friendly alternative. The greatest environmental benefits result from the combined use of steel slag and reclaimed asphalt, which is attributed to lesser demands for raw material extraction, bitumen production, and resource supply. On the contrary, the contribution of lowering mixtures’ production temperature by 30°C is minimal.

摘要

这项研究量化了与工业副产品和再生材料以及热混合沥青（WMA）添加剂结合用于沥青路面施工的磨损层混合物中相关的潜在环境效益。与参考热混合沥青（HMA）进行了比较分析，分析了电弧炉（EAF）基于钢渣的混合物和掺入了钢渣和分馏再生沥青（RA）的三种回收混合物，这些组分的含量各不相同（即25、40和50％）使用“从摇篮到大门”的方法。这项研究的结果表明，掺有钢渣和50％RA的温热沥青混合物是最环保的选择。钢渣和再生沥青的结合使用可带来最大的环境效益，这归因于对原料提取的需求减少，沥青生产和资源供应。相反，将混合物的生产温度降低30°C的贡献最小。