Michigan Residential Builders License Practice Test

Which type of concrete is an example of prestressed concrete?

1. Double T used in parking garages

2. Concrete pavers

3. Precast slabs

4. Standard mix concrete

The correct answer is: Double T used in parking garages

Prestressed concrete is a type of concrete in which internal stresses are intentionally introduced to counteract the tensile stresses that will occur in service. This process enhances the performance of the concrete, allowing it to withstand greater loads and span longer distances without cracking or deflecting excessively. The example of double T used in parking garages represents a common application of prestressed concrete. These double T beams are designed with high-strength steel tendons that are tensioned before the concrete is applied. This pre-tensioning process compresses the concrete, allowing it to handle the tensile forces experienced during use. They are ideal for garage structures because they provide the necessary strength and support while allowing for efficient space utilization. The other options do not embody prestressed concrete. For instance, while concrete pavers and precast slabs are valuable construction elements, they do not typically undergo the prestressing process. Standard mix concrete, which is the most basic form of concrete without any adjustments made for pre-stressing, also lacks the internal tensioning that defines prestressed variants. Thus, double T beams are a clear representation of prestressed concrete owing to their construction and intended load-bearing capabilities.