What temperature must be monitored during accelerated curing of concrete?

Monitoring the maximum curing temperature during accelerated curing of concrete is crucial for several reasons. The accelerated curing process often involves applying heat to enhance the hydration of cement and achieve strength gains more quickly. However, if the temperature exceeds certain limits, it can negatively affect the concrete's properties, including strength, durability, and overall integrity.

By carefully monitoring the maximum curing temperature, you ensure that the concrete remains within acceptable limits that promote optimal curing without risking damage. Temperatures that are too high can lead to issues like thermal cracking or inadequate bonding between the concrete and any reinforcements due to uneven curing rates.

In the context of the other options, while ambient temperature and specified curing intervals may also be monitored as part of the overall curing process, they do not directly address the critical parameter of preventing excessive heat during accelerated curing. Monitoring at 200°F is not typically used in standard practices as it could be above the maximum curing temperature for many types of concrete. Thus, focusing on the maximum curing temperature is essential for successful accelerated curing.