Utilization and Sustainability Evaluation of Steel Slag and RAP in Hot Recycled Asphalt Mixtures—Case Study
Liang Song, Zijie Xie, Jie Gao, Chong Gao, Le Wang, Mingwen Tao
TL;DR
This study evaluates a sustainable asphalt mixture using steel slag and reclaimed asphalt pavement, showing improved performance and reduced environmental impact.
Contribution
The study introduces an integrated environmental–economic evaluation framework for sustainable asphalt mixtures using real project data.
Findings
SSRM with 50% RAP and 23% steel slag showed 14–16% higher dynamic stability and 20–25% higher fracture energy at −10°C compared to conventional mixtures.
SSRM reduces carbon emissions by 10–11% compared to RM and about 40% compared to conventional virgin mixtures.
Transportation sensitivity analysis identifies emission and cost thresholds for sustainable material selection in highway construction.
Abstract
To address natural aggregate scarcity and improve the high-value utilization of Reclaimed Asphalt Pavement (RAP), this study proposes a steel slag–RAP hot recycled asphalt mixture (SSRM) as a sustainable alternative to conventional limestone–RAP mixtures (RM). Unlike previous studies mainly focusing on performance verification, an integrated environmental–economic evaluation framework was developed based on real highway expansion project data under a “cradle-to-gate” boundary and incorporating transportation distance thresholds. SSRM containing 50% RAP and 23% steel slag as coarse aggregate replacement was evaluated through rutting, semi-circular bending (SCB), freeze–thaw splitting (TSR), and skid resistance tests. Compared with RM, SSRM exhibited 14–16% higher dynamic stability and 20–25% higher fracture energy at −10 °C, along with improved moisture stability and skid resistance,…
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Taxonomy
TopicsAsphalt Pavement Performance Evaluation · Recycled Aggregate Concrete Performance · Infrastructure Maintenance and Monitoring