Performance Evaluation of Hybrid EAF Slag and RAP in Pavement

This study evaluated the mixture of Hot Mix Asphalt (HMA) containing Electric Arc Furnace (EAF) slag and Reclaim Asphalt Pavement (RAP). The first design contains 30% EAF slag and the second hybrid design contains mixed EAF slag and RAP, each 20%. Compared to the control group, EAF slag and EAF slag + RAP have lower stability in Marshall Test, but perform better in rutting resistance and moisture sensitivity. In the second part of the study, there are three designs mixture on the test road. The test piece was drilled for the Hamburg wheel test (HWT) after paving, showing better creep performance on EAF; hybrid EAF slag + RAP showed the best stripping results. On the Stripping Inflection Point (SIP), EAF slag has better results of the corresponding ruts and times. Besides, EAF slag + RAP does not show asphalt stripping. EAF slag and EAF slag + RAP have similar results from the performance of the rut depth of 12.5 mm. From the above study, adding one or even mixing two kinds of recycled materials can still meet the design requirements, and it is worthwhile for further study of different recycled materials using in the pavement.