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of /home/abouaayt/public_html/aboutcivil/answers/qa-plugin/user-management/layer.php How much gap is required between pouring casting of ground floor and pouring concrete for column - Civil Engineering Technical Questions Answers - Ask a Civil Engineer
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How much gap is required between pouring casting of ground floor and pouring concrete for column
 

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Usually it takes about 28 days for concrete to achieve its design strength but you can start column construction just after two weeks of finishing of ground floor because while construction of columns you would not be utilizing all the design strength at once.
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