Calcium carbonate concrete (CCC) is produced by incorporating recycled concrete fines as aggregate and a binder derived from calcium carbonate precipitated from a solution extracted from recycled concrete waste. This innovative approach exploits the interconnected pores formed by the recycled concrete particles, allowing the binder to deposit and enhance structural integrity. The initial one-day preparation of CCC provides an opportunity to examine its strength, relying on the formation of different polymorphs in its structure during the precipitation process of calcium bicarbonate solutions. This study focuses on the strength development of CCC manufactured over five days at 70 ℃. Remarkably, the compressive strength of CCC increases approximately two-fold after an additional four days of production compared to that of CCC at one day of making. The extended production time contributes to the heightened accumulation and deposition of calcium carbonate crystals in the interstitial spaces between the aggregate particles. Furthermore, the evolution of the phase assemblage of cement paste within the aggregate particles significantly contributes to the overall strength development of CCC. This comprehensive analysis illuminates the intricate mechanisms influencing the strength properties of CCC and emphasizes its potential as a sustainable construction material.