Alabama Contractors License Practice Exam

When using shotcrete, what is the maximum size of reinforcing bars?

1. No. 3

2. No. 4

3. No. 5

4. No. 6

The correct answer is: No. 4

In the context of shotcrete applications, the design considerations for reinforcing bars are crucial for ensuring structural integrity. The maximum size of reinforcing bars that can be effectively used with shotcrete is generally No. 4. This is primarily due to the nature of the shotcrete application method, which involves spraying a mixture at high velocity onto surfaces. Larger bars can be difficult to handle and place correctly in conjunction with the shotcrete, potentially leading to issues with adequate anchorage and bonding of the shotcrete to the reinforcing material. No. 4 bars, measuring 1/2 inch in diameter, provide a good balance between strength and manageability, allowing for a more effective application process while maintaining the required structural benefits. This size limit helps ensure that the shotcrete can adequately cover the bars and bond effectively to them, thus contributing to the overall strength and durability of the constructed element. Using larger bars, while theoretically possible, may lead to practical complications in application and insufficient embedding, which could compromise the structural performance.