Utilization of Recycled Concrete Dust and Lime as a Binary Blended Filler in Cold Bitumen Emulsion Mix

The cold bitumen emulsion mix (CBEM) offers environmental benefits and cost-effectiveness compared to previous approaches due to the nearly complete elimination of the heating process and convenience of use. However, its poor early strength must be addressed to increase its use. On the other hand, natural aggregate resource depletion and the generation of construction and demolition (C&D) waste are becoming serious global issues. In order to solve these issues, the present study used recycled concrete dust (RCD), which originated from C&D waste, as a filler in CBEM. In the study, conventional stone dust (SD) filler is replaced by RCD in a proportion of 1–5% of the weight of total aggregates and optimized based on the ITS test. Lime was then blended with an optimized RCD in CBEM. For analysis, Marshal stability, Marshal quotient, indirect tensile strength (ITS), and indirect tensile strength ratio (ITSR) tests were used. The results obtained from these tests were compared with the control CBEM sample, and it was found that the inclusion of RCD and lime by 3% and 2%, respectively, of total aggregate weight as a binary blended filler improved the properties of CBEM and met the requirement for medium traffic volume.