Effect of Waste Transformer Oil (WTO) and Waste Engine Oil (WEO) on the Performance of 100% RAP Mixes at Reduced Mixing Temperatures

Using sustainable materials in pavement construction has become essential nowadays to conserve material resources. This paper discusses the effect of Waste Transformer Oil (WTO) and Waste Engine Oil (WEO) on the performance of 100% RAP mixes produced at reduced mixing temperatures and compaction efforts. The mixing temperatures selected in the study are 125, 135, 145, 155, and 165 °C. Compaction efforts selected are 75 and 50 blows. The rejuvenator dosages used are 0.5 and 1% by weight of RAP content. Marshall samples were cast and tested for Marshall stability and flow. Volumetric properties (air voids, VMA, and VFA) are also determined for all the samples. 0% oil dosage could satisfy all the Marshall properties at 125 °C at 75 blows. 0% oil dosage at 155 and 165 °C and 0.5% WEO dosage at 135 °C could satisfy all the Marshall properties at 50 blows. It is concluded from the results that adding WEO at 0.5% dosage improves the workability of the mix, leading to better compaction, and helps in producing mixes at reduced temperatures and compaction effort. 100% RAP mixes can be produced at reduced mixing temperatures and compaction efforts with WEO as the rejuvenator. Testing of RAP mixes by adding fresh aggregates with or without a fresh binder may be tried to check the effectiveness of WTO as a rejuvenator for the future scope of the work. Performance-based testing of 100% RAP mixes may also be tried as the future scope of work.