What happens if the temperature is outside the specified curing range for a concrete specimen?

When the temperature is outside the specified curing range for a concrete specimen, it can lead to insufficient strength. Proper curing temperature is critical for the hydration process of cement. If the temperature is too low, it can slow down the hydration reactions, potentially leading to incomplete curing and a weaker final product. Conversely, if the temperature is too high, it can accelerate the hydration process to the point where it causes rapid drying and cracking, which also compromises the strength of the concrete.

In summary, maintaining the concrete within the specified curing temperature range is essential to ensure optimal hydration and achieve the desired strength and durability of the finished concrete.