Discussion
Durability of concrete in the marine splash zone is threatened chiefly by
Answer: A
Correct answer: chloride induced corrosion of any reinforcement present
The splash zone is the worst environment for reinforced concrete: wetting and drying concentrate chloride at the surface, and the abundant oxygen supports the corrosion reaction once the chloride has broken down the passive film on the steel. The rust occupies more volume than the steel it replaced, and spalls the cover off. The remedies are thick cover, low permeability concrete and, where warranted, stainless or coated reinforcement.
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