Which of the following can be used to set steel posts?

• A. Sand
• B. Hydraulic cements
• C. Filling
• D. Gravel

Answer: (B)

When setting steel posts, you need a material that turns into a solid, stable anchor around the post. Hydraulic cement fits that need because it sets and gains strength quickly in the presence of moisture, even underground, forming a rigid mass that holds the post securely. It’s designed for quick, durable anchoring in fence work.

Loose fills like sand or gravel don’t harden into a fixed mass, so they can wash out or shift and fail to provide the necessary strength and stability. “Filling” backfill in this context also won’t give a solid anchor.

So hydraulic cement is the appropriate choice for setting steel posts.