Coastal and Floodplain Construction Inspector's Practice Exam

What is the minimum specified compressive strength of concrete used for basement walls not exposed to weather in Florida?

1. 2500 psi

2. 3000 psi

3. 3500 psi

4. 4000 psi

The correct answer is: 3000 psi

The minimum specified compressive strength of concrete used for basement walls not exposed to weather in Florida is 3000 psi. This strength is determined by various building codes and guidelines that ensure the structural integrity and durability of concrete structures in different environmental conditions. The choice of 3000 psi is based on the understanding that while basement walls are below the ground and not directly exposed to weather elements, they still need to withstand not only the weight of the soil but also any hydrostatic pressures that might occur due to groundwater. This compressive strength provides a balance between performance requirements and cost-effectiveness, making it a standard choice in the construction industry for such applications. Concrete with a strength lower than 3000 psi may not provide sufficient durability or may be more prone to cracking or other structural issues over time. Higher strength concrete mixes, while beneficial in certain applications, may be unnecessary and cost-prohibitive for basement walls that do not face exposure to severe environmental conditions. Hence, the specification of 3000 psi aligns with both safety and economic considerations in structural engineering practices.