Which statement about leveling courses is true?

• A. Creates a smooth, uniform substrate and corrects minor irregularities before pouring.
• B. Provides decorative texture on the surface.
• C. Cures the concrete.
• D. Acts as a final wearing surface.

Answer: (A)

Leveling courses are used to create a smooth, uniform substrate and fix minor irregularities before the main concrete is poured. By evening out high spots and filling in low spots on the subgrade or base, this thin layer helps ensure the slab will pour out evenly and bond properly, reducing the risk of an uneven finish or cracks in the concrete above. It’s not intended to add texture or decorative detail, and it isn’t a curing step—that happens after the concrete is placed and kept moist to develop strength. It also isn’t the final wearing surface; the leveling layer is covered by the structural slab, which bears the traffic and wear in service.