What is the purpose of rebar ties?

• A. To color-code bars for identification.
• B. To attach bar markers for inspection.
• C. To align bars with formwork.
• D. To secure bars together to prevent movement during concrete placement.

Answer: (D)

Rebar ties are used to secure reinforcing bars in their intended positions so they don’t shift when concrete is placed and vibrated. By tying intersections and keeping bars at the correct spacing and alignment, the grid stays in place until the concrete gains strength. This prevents movement that could create voids, misalignment, or insufficient cover, which would undermine the structural performance. Color-coding or markers aren’t the function of ties, and tying’s main purpose is to keep the bars from moving during the pour.