Michigan Residential Builders License Practice Test

What is the requirement for concrete temperature maintenance to ensure proper curing?

1. Must exceed 45 degrees

2. Must be at least 50 degrees

3. Must be consistent at room temperature

4. Must not fall below freezing

The correct answer is: Must be at least 50 degrees

To ensure proper curing of concrete, it is essential that the temperature is maintained at a minimum of 50 degrees Fahrenheit. Proper curing facilitates hydration, which is critical for achieving the desired strength and durability of the concrete. At temperatures below 50 degrees, the curing process can slow down significantly, impacting the overall quality of the concrete. Hydration is a chemical reaction that occurs between water and the cement in concrete. If the temperature is too low, this reaction can be inhibited, leading to incomplete curing and potential weaknesses in the structure. Maintaining a temperature of at least 50 degrees helps to optimize the conditions for effective curing. While temperatures exceeding 45 degrees or avoiding freezing conditions are beneficial, the 50-degree mark provides a specific threshold that is commonly recognized for achieving satisfactory results in concrete curing. Any fluctuations or significant drops in temperature during the curing process can adversely affect the concrete's final properties, hence the emphasis on maintaining that 50 degrees.