Red Seal Ironworker (Reinforcing) Practice Exam

During placement, how is vertical rebar typically secured?

1. By driving it into the concrete

2. With ties or chairs to maintain proper positioning

3. With adhesives to ensure stability

4. By welding to horizontal rebar

The correct answer is: With ties or chairs to maintain proper positioning

Vertical rebar is typically secured during placement using ties or chairs to maintain proper positioning. Ties are made from wire and are wrapped around the rebar to hold it in place, ensuring that the vertical bars remain spaced correctly and aligned as per design specifications. Chairs are small supports that lift the rebar off the ground or forms and maintain the designated height, preventing it from sinking or moving during concrete placement. This method is essential for ensuring that the rebar is embedded at the correct location within the concrete, allowing for optimal structural integrity and load-bearing capacity. Using ties and chairs is a standard practice in reinforcing steel placement because it allows for adjustments to be made as needed and ensures that the reinforcement is in the correct position to effectively carry the loads intended in the design. Other methods, like driving rebar into concrete or using adhesives, are not standard practices and could compromise the stability and effectiveness of the reinforcement. Additionally, welding typically applies to different types of configurations, not standard vertical placements.