Yes, rock salt can damage unsealed asphalt. Sodium chloride (Rock Salt) can accelerate the normal deterioration caused by freeze-thaw cycles in winter, shortening the lifespan of asphalt. The key to preventing damage to your asphalt starts in the summer with proper asphalt maintenance. Proper maintenance including seal coating, crack repair and paving keep your driveway or parking lot protected and minimize water penetration. Water penetration is especially problematic in the winter when water melted by salt can seep into your asphalt and re-freeze.
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