What finishing practice is most associated with reducing surface scaling on exterior slabs?

What finishing practice is most associated with reducing surface scaling on exterior slabs?

• A. Minimal finishing
• B. Intense polishing while wet
• C. Heavy brooming on all slabs
• D. Early heavy grinding

Answer: (A)

Surface scaling on exterior slabs is driven by how moisture and salts move at the surface during freeze–thaw cycles. Finishing decisions that make the surface more open and permeable help water drain and dry more quickly, reducing the conditions that cause scaling. Minimal finishing leaves a natural, lightly textured surface without densifying or sealing it, so capillary pathways remain and moisture is less likely to be trapped near the surface. This openness also means the surface can shed de-icing salts more readily, lowering the chance of scaling as temperatures fluctuate. Polishing while wet creates a very smooth, dense surface with low permeability, which can trap moisture and salts and actually promote scaling. Heavy brooming, while it increases texture, can retain moisture in the ridges and pockets, contributing to scaling under freeze–thaw. Early heavy grinding removes a lot of the surface layer and can expose weaker material or create micro-cracks, which can also worsen scaling resistance.

Surface scaling on exterior slabs is driven by how moisture and salts move at the surface during freeze–thaw cycles. Finishing decisions that make the surface more open and permeable help water drain and dry more quickly, reducing the conditions that cause scaling. Minimal finishing leaves a natural, lightly textured surface without densifying or sealing it, so capillary pathways remain and moisture is less likely to be trapped near the surface. This openness also means the surface can shed de-icing salts more readily, lowering the chance of scaling as temperatures fluctuate.

Polishing while wet creates a very smooth, dense surface with low permeability, which can trap moisture and salts and actually promote scaling. Heavy brooming, while it increases texture, can retain moisture in the ridges and pockets, contributing to scaling under freeze–thaw. Early heavy grinding removes a lot of the surface layer and can expose weaker material or create micro-cracks, which can also worsen scaling resistance.