Early-age behavior of concrete refers to the properties and characteristics of concrete that manifest within the first hours to days after mixing and placing. This phase is crucial as it significantly influences the long-term durability and strength of the structure. The early-age behavior includes the processes of setting, heat evolution from hydration, development of mechanical strength, and volume changes due to temperature and moisture variations. Understanding these behaviors is essential for ensuring that concrete structures can withstand environmental stresses during their initial and most vulnerable phases, such as in extreme temperatures or humid conditions, which can lead to issues like cracking or premature degradation.