Some would suggest aesthetics as the answer of the question. Others may consider safety on the contrary because chamfered edge is less liable to damage to the concrete structure and any objects hitting on it. However, the main reason of the provision of chamfer is to make formworks easier to pull out after concreting operation.
It is not uncommon that concrete is getting adhered to formwork and tore away during removal of formwork. In fact, the formation of a sharp nice corner is practically difficult and the concrete at corners is easily chipped and broken into pieces during the removal of formwork. Hence, the provision of chamber could protect the corner from chipping when striking formwork.
This question is taken from book named – A Closer Look at Prevailing Civil Engineering Practice – What, Why and How by Vincent T. H. CHU.
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Dear Sir,
What do you mean by chamfer concrete
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Is a chamfer critical in the design of exposed concrete edges and what is the criticality that chamfers should be a requirement to prevent the rapid deformation of exposed edges with the risk of the rebar being exposed by chipping away of the edges which will lead to corrosion of the rebar and early deterioration of the concrete.
Is it acceptable practice not to require chamfered edges on exposed concrete edges.