What step is typically taken to ensure rebar surfaces remain clean before pour?

• A. Welding bars to each other.
• B. Covering bars with oil.
• C. Leaving the bars untreated.
• D. Cleaning or degreasing the bars and inspecting for contaminants.

Answer: (D)

Clean, oil-free surfaces on rebar are essential for a strong bond between steel and poured concrete. Any oil, grease, dirt, form-release agent, paint, or loose rust can create a barrier that prevents the concrete from properly adhering to the steel, reducing bond and long-term durability. Cleaning or degreasing the bars and inspecting for contaminants directly addresses removing these substances and confirms the surface is ready to bond with the concrete. That’s why this option is best. Welding bars together, covering them with oil, or leaving them untreated would either add contaminants or fail to prepare the surface for bonding.