Cold in-place recycling (CIPR) is a technique whereby the deteriorated pavement surface is recycled back to produce a new pavement base course by using a CIPR machine with the addition of a stabilizer. A chemical stabilizer is one of the stabilizers that can be used. In Malaysia, ordinary Portland cement (OPC) is the most widely used chemical stabilizer for CIPR. However, higher production of cement leads to higher pollution in the atmosphere. Researchers are constantly looking for cement-alternative materials, especially sustainable green materials. Therefore, this study was conducted using a waste coal bottom ash, ground to a very fine particle and mixed with OPC as a stabilizer with the presence of calcium chloride (CaCl2). The primary goals of this research are to analyze how incorporating ground coal bottom ash (GCBA) as a partial substitute for OPC affects the characteristic and compaction properties of the proposed design mix. Sieve analysis, particle shape, specific gravity, and pH index were among the tests conducted. A modified proctor test was also done to determine the optimum moisture content (OMC), maximum dry density (MDD), and bulk density of the mix. The results show that the OMC was 5.60% with MDD at 1.93 Mg/m3 while the mix with 4% of OPC and 1% of CaCl2 recorded the highest bulk density at 2.05 Mg/m3. This indicates that the presence of GCBA and CaCl2 exerts a discernible influence on the properties of the base course.