Which of the following is not a common use of concrete?

• A. Foundations and Footings
• B. Driveways and Sidewalks
• C. Glass Windows
• D. Piers

Answer: (C)

Concrete is chosen for parts of a structure that must carry loads and endure weather, thanks to its high compressive strength and durability. Foundations and footings transfer the building’s weight into the ground, and piers do similar load-bearing work, so concrete is a natural fit there. For paving, driveways and sidewalks, concrete stands up well to foot and vehicle traffic and resists wear and moisture over many years, making it a standard choice.

Glass windows, by contrast, are not made from concrete because they require transparency, light transmission, and a much lighter, flexible material. Concrete is dense and opaque, and while it can frame openings or form sills, the actual window pane is glass. So glass windows are not a common use of concrete.