North Carolina Building Contractor License Practice Exam

What is the minimum compressive strength required for a carport slab in a severe exposure zone?

1. 2000 PSI

2. 3000 PSI

3. 3500 PSI

4. 4000 PSI

The correct answer is: 3500 PSI

In North Carolina, when constructing a carport slab in a severe exposure zone, the minimum compressive strength of the concrete must be specified to ensure durability and resistance to environmental conditions such as freeze-thaw cycles and moisture exposure. The requirement of 3500 PSI for compressive strength in this context is based on standards that prioritize the structural integrity and longevity of concrete in areas that experience harsh weather. Concrete with a compressive strength of 3500 PSI provides the necessary strength to support loads while also offering enhanced protection against potential degradation from exposure to severe weather conditions. This level of strength helps prevent cracks and damage over time, ensuring that the carport remains functional and safe for use. In severe exposure zones, it is crucial to exceed minimum standards because the risks posed by the environment can significantly impact the performance of lower-strength mixtures. The other options do not meet the requirements for severe exposure zones, as lower compressive strengths are generally suitable for less demanding applications or less extreme environmental conditions. Hence, the selection of 3500 PSI aligns with industry standards and best practices for concrete durability in challenging settings.