How do deicing salts affect steel bridges?

How do deicing salts affect steel bridges?

• A. They accelerate corrosion of steel and deterioration of protective coatings, increasing rust risk and potential structural issues
• B. They strengthen steel
• C. They have no effect
• D. They only affect asphalt

Answer: (A)

Deicing salts introduce chloride ions that accelerate corrosion of exposed steel when moisture is present. They can damage protective coatings and coatings on steel components, allowing rust to form more quickly. As rust grows, it expands and forces against surrounding material, leading to cracking, spalling, and loss of cross‑section, which raises the risk of structural issues over time. The salts do not strengthen steel and they do have a meaningful effect on steel components, not just asphalt.

Deicing salts introduce chloride ions that accelerate corrosion of exposed steel when moisture is present. They can damage protective coatings and coatings on steel components, allowing rust to form more quickly. As rust grows, it expands and forces against surrounding material, leading to cracking, spalling, and loss of cross‑section, which raises the risk of structural issues over time. The salts do not strengthen steel and they do have a meaningful effect on steel components, not just asphalt.