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Additional recommended knowledge
Purpose of Provision of Concrete Cover
The amount of cover depth that needs to be provided is usually based on the exposure conditions that the structure is likely to be subjected. The Indian Concrete Code mandates the following:
Other national codes also specify minimum cover requirements based on their respective local exposure conditions.
Large cover depths (50-75 mm) are required to protect reinforcement against corrosion in aggressive environments, but thick cover leads to increased crack widths in flexural reinforced concrete members. Large crack-widths (greater than 0.3 mm) permit ingress of moisture and chemical attack to the concrete, resulting in possible corrosion of reinforcement and deterioration of concrete. Therefore, thick covers defeat the very purpose for which it is provided. There is a need for judicious balance of cover depth and crack width requirements.
Methods of maintaining cover
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Concrete_cover". A list of authors is available in Wikipedia.|