Surface Preparation - PCC Pavement Overlay includes which actions?

• A. Only cleaning
• B. Milling the surface
• C. Full depth replacement of distressed slabs, spalled joints repaired partial depth, stabilize rocking slabs, replace joint sealer, clean and tack surface
• D. Painting the surface

Answer: (C)

Surface preparation for a PCC pavement overlay must address both structural issues and surface cleanliness so the new layer can bond properly and perform well over time. The most complete approach includes removing and replacing distressed areas, repairing joints, stabilizing slabs that rock, resealing joints, and preparing the surface with a clean, tack-coated finish.

Full depth replacement of distressed slabs eliminates weak portions that would crack or spall under the new layer. Repairing spalled joints stops water and debris from infiltrating joints, which can undermine the bond and base. Partial depth repairs target localized damage without unnecessarily removing good concrete. Stabilizing rocking slabs prevents differential movement that would transfer stresses into the overlay, causing cracks. Replacing the joint sealer helps seal joints again so water intrusion doesn’t undermine the pavement. Finally, cleaning and tack coating the surface provides a clean substrate and the proper adhesion conditions for the new overlay.

Other options that involve only cleaning, or just milling, or painting, do not address these structural and bonding concerns, and would risk premature failure of the overlay.