The best material for securing a steel post in a concrete hole is which of the following?

The best material for securing a steel post in a concrete hole is which of the following?

• A. Sulfur
• B. Gypsum
• C. Grout
• D. Sand

Answer: (C)

When anchoring a steel post in a concrete-filled hole, you need a material that bonds to both metal and concrete and hardens to resist loads. Grout is designed for this purpose: it fills gaps, adheres well to the steel and surrounding concrete, and cures into a solid mass that transfers wind and loading safely into the foundation. This creates a stable, non-porous connection that resists movement. Sulfur isn’t used for anchoring and can be corrosive to steel over time. Gypsum lacks the strength and moisture resistance needed for outdoor structural anchoring. Sand is only a filler and provides no bonding or load transfer, so it won’t hold the post securely under stress.

When anchoring a steel post in a concrete-filled hole, you need a material that bonds to both metal and concrete and hardens to resist loads. Grout is designed for this purpose: it fills gaps, adheres well to the steel and surrounding concrete, and cures into a solid mass that transfers wind and loading safely into the foundation. This creates a stable, non-porous connection that resists movement.

Sulfur isn’t used for anchoring and can be corrosive to steel over time. Gypsum lacks the strength and moisture resistance needed for outdoor structural anchoring. Sand is only a filler and provides no bonding or load transfer, so it won’t hold the post securely under stress.