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Which bridge parapet is better, steel parapet or aluminum parapet?

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Steel parapets normal requires painting or pre-treatment with hot-dip galvanizing as they are prone to corrosion and they are normally the cheapest choice for normal containment level of vehicles.

The initial material and setup cost of aluminum parapet is high. They are free of the problem of corrosion and the design of aluminum parapets does not require surface protection. However, owing to their high material price, care should be taken on the design to prevent stolen of parts of parapet. Moreover, aluminum parapet is lighter than steel and has weight savings over steel parapets.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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