What does the ACI 318 Building Code require for concrete maintenance after placement?

The ACI 318 Building Code emphasizes the importance of curing concrete to ensure proper strength development and durability. Maintaining concrete in a moist condition for the initial seven days is essential, as hydration is critical for the chemical reactions that lead to concrete hardening. This moist curing period helps to prevent surface cracking, reduces drying shrinkage, and allows the concrete to reach its designed strength effectively.

During the first week after placement, concrete continues to gain strength, and adequate moisture helps to sustain the hydration process. It is widely recognized in concrete technology that proper curing significantly impacts the final properties of concrete, including compressive strength and resistance to thermal cracking. Therefore, option B aligns with best practices outlined in the ACI 318 guidelines and industry standards for concrete maintenance.