This study investigates the use of reclaimed asphalt pavement (RAP) stabilized with geopolymer derived from coal ash as a potential material for roadway base. The primary objective is to evaluate the unconfined compressive strength (UCS) of RAP-geopolymer specimens subjected to heating-cooling cycles curing. The findings indicate that RAP, when enhanced with an appropriate geopolymer derived from fly ash and bottom ash, can achieve sufficient UCS (not less than 40 kg/cm2) after 7 days of curing, making it suitable for roadway base applications. The study reveals that the ratio of fly ash to bottom ash significantly influences UCS, with higher fly ash content leading to greater UCS values. Conversely, an increase in bottom ash proportion results in decreased UCS. Furthermore, the UCS of specimens cured under heating-cooling cycles at 40 °C showed no significant difference from those cured at room temperature. However, curing at 70 °C enhanced UCS for all specimens compared to room temperature curing. Under room temperature conditions, specimens using only NaOH exhibited higher UCS than those using a combination of NaOH and Na2SiO3. Although this trend persisted at 70 °C, the differences in UCS were less pronounced, suggesting that the effect of solution ratios on UCS diminishes at higher curing temperatures.