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Ice Melt and Your Iowa City Driveway: How to Avoid Concrete Scaling

By Iowa City Concrete Pros · October 29, 2026

Before you scatter ice melt on your Iowa City driveway this winter, know what it can do to the concrete. The National Ready Mixed Concrete Association (NRMCA) lists excessive amounts of deicing chemicals among the causes of scaling, where the finished surface flakes or peels off after freezing and thawing. [NRMCA]

What scaling looks like

NRMCA says light scaling does not expose the coarse aggregate (the stone). Moderate scaling exposes the aggregate and may take off up to 1/8 to 3/8 inch of the surface. In severe scaling, more surface is lost and the aggregate clearly stands out. [NRMCA]

New concrete: no deicers the first winter

NRMCA says to avoid deicing chemicals on newly placed concrete if possible, and to avoid them in the first winter. Use clean sand for traction instead. [NRMCA]

Older concrete: use the right salt, in moderation

• Calcium chloride and sodium chloride (rock salt) are considered acceptable for concrete. Use them in moderate amounts, since heavy applications raise the risk of scaling. [NRMCA]
• Never use ammonium sulfate or ammonium nitrate, or magnesium-based salts. NRMCA says these are chemically aggressive and destroy concrete surfaces. [NRMCA]
• Hose off salt that cars leave on driveways and garage slabs when conditions permit. [NRMCA]
• Watch for standing water. Poor drainage that lets salty water collect can make scaling worse. [NRMCA]

Seal it

A breathable sealer, such as a silane or siloxane, helps protect concrete. NRMCA says to apply it when the concrete is reasonably dry, and late summer is ideal. [NRMCA]

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Already scaled?

NRMCA says minor scaling is mostly cosmetic. Light to moderate scaling can be repaired with a thin bonded resurfacing, though the repair won't match the color of the original concrete. [NRMCA] A local concrete pro can tell you whether to resurface or replace.

Sources

• National Ready Mixed Concrete Association: CIP 2, Scaling Concrete Surfaces (PDF)

Iowa City Concrete Pros is an editorial local guide with a daily blog for Iowa City, with links to local pros and associates.

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