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of /home/abouaayt/public_html/aboutcivil/answers/qa-plugin/user-management/layer.php why 7 & 28 days only for crushing & comprehensive strength in cement concrete mix design ? - Civil Engineering Technical Questions Answers - Ask a Civil Engineer
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why 7 & 28 days only for crushing & comprehensive  strength in cement concrete mix design ?
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Please try to use the search option before asking questions...... You can find the answer to your question at the following link:

Why to test for 7 and 28 days compressive strength?

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