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Test cores

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Prior to the placing of concrete to its final position , although there are always some site tests conducted to verify the consistency of the material , however the degree of final compaction is still uncertain . Visual inspection on the deployment of exterior or internal vibrators or the paving machine may help to justify the degree of compaction , nevertheless this watch-out may be quite subjective and requires some further proof . The Engineer or the specification may require subsequent cores for compression test to demonstrate that the finished product has achieved the specified strength . Or occasionally if the site performance is in doubt , for instance the formation of cold joint , the Engineer may require specific test cores at the affected area to prove whether the finished product is still in compliance with the specification .

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