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of /home/abouaayt/public_html/aboutcivil/answers/qa-plugin/user-management/layer.php What is plastic shrinkage cracking? - Civil Engineering Technical Questions Answers - Ask a Civil Engineer
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What is plastic shrinkage cracking?

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Plastic shrinkage cracks appear in the surface of fresh concrete soon after it is placed and while it is still plastic. These cracks appear mostly on horizontal surfaces. They are usually parallel to each other on the order of 1 to 3 feet apart, relatively shallow, and generally do not intersect the perimeter of the slab. Plastic shrinkage cracking is highly likely to occur when high evaporation rates cause the concrete surface to dry out before it has set. Plastic shrinkage cracks are unsightly but rarely impair the strength or durability of concrete floors and pavements. The development of these cracks can be minimized if appropriate measures are taken prior to and
  during placing and finishing concrete

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