North Carolina Building Contractor License Practice Exam

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What is the minimum temperature maintenance requirement for concrete?

40 degrees for 4 days
50 degrees for 7 days
60 degrees for 5 days
70 degrees for 3 days

The correct answer is: 50 degrees for 7 days

The correct answer is based on the guidelines for curing concrete, which is critical for the durability and strength of the finished product. In North Carolina, the minimum temperature maintenance requirement for curing concrete is 50 degrees Fahrenheit for at least 7 days. This duration allows for proper hydration of the cement, enabling it to gain strength and achieve the desired structural integrity. Maintaining the temperature above this threshold helps prevent issues such as freezing, which can have detrimental effects on the concrete's curing process. Additionally, a consistent temperature allows for effective moisture retention, further enhancing the curing conditions necessary for optimal concrete development. This requirement is especially crucial in regions where temperatures can fluctuate significantly, ensuring that the concrete will perform well over its lifespan.