Rejuvenation of reclaimed asphalt pavement

A method of rejuvenating reclaimed asphalt pavement (RAP), the method comprising:

• mixing RAP, oil sludge, at least one asphalt binder, and at least one aggregate at a temperature in a range of from 100 to 200° C. to form a mixture;
• and
• compacting the mixture to form a rejuvenated paving material,
• wherein the oil sludge comprises water in a range of from 60 to 80 wt. %, sediments in a range of from 10 to 30 wt. %, and hydrocarbon oils in a range of from 5 to 30 wt. %, based on a total weight of the oil sludge,
• wherein the mixture comprises the oil sludge in a range of from 1.5 to 2 wt. %, based on a total weight of the RAP,
• wherein the at least one asphalt binder is at least one selected from the group consisting of PG58-22, PG64-10, PG64-16, PG64-28, and PG70-10, the at least one asphalt binder being present in a range of from 20 to 25 wt. %, based on the total weight of the RAP,
• wherein the at least one aggregate is at least one selected from the group consisting of limestone, granite, syenite, diorite, basalt, diabase, and gabbro, sandstone, chert, shale, gneiss, schist, slate, quartzite, marble, and serpentine, a balance of the mixture being the at least one aggregate and new asphalt pavement,
• wherein the mixture comprises the RAP in a range of from 20 to 40 wt. %, based on a total weight of the mixture, and
• wherein the rejuvenated paving material has a retained Marshall stability of in a range of from 75 to 85%, the retained Marshall stability being measured according to AASHTO:
• T245 (2019) on a first set of 3 samples being saturated and conditioned at 60° C. in water bath for 35 minutes prior to measuring Marshall stability, a second set of 3 samples of the same AC-mix being subjected to saturation and conditioning at 60° C. in water bath for 24 hours, the Marshall stability of the second set of samples being measured and corrected according to heights of the 3 samples according to equation (1):
• RS
• =
• MS
• f
• MS
• o
• ×
• 100
• ,
• (
• 1
• )
• wherein an average corrected stability of the first set of samples is MS an average corrected stability of the second set of samples is MSf, and the retained Marshall stability is RS.