What relationship exists between concrete aging and its strength?

The relationship between concrete aging and its strength is characterized by the fact that concrete generally gains strength over time through a process known as continued hydration. Hydration is the chemical reaction that occurs when water is added to cement, and it initiates the setting and hardening of concrete. Although most strength gain occurs within the first 28 days of curing, the crystalline structure of the cement continues to develop and react with moisture in the concrete mix, allowing for further strength increase over the months and even years post-installation.

This ability to gain strength over time reflects the continuous chemical processes taking place within the concrete, making it stronger and more durable as it ages—provided that it is kept adequately hydrated and protected from adverse environmental conditions. Thus, the correct choice highlights the dynamic nature of concrete's strength development throughout its life cycle.