Concrete Joints Defined: Contraction Joints — Used to divide large pours of concrete into smaller structural units, contraction joints create a man-made plane of weakness to regulate and control (another name for a contraction joint is a control joint) the location of a crack formed by moisture loss of concrete. Without this formed contraction joint, the concrete would freely crack in unexpected and unattractive locations. Construction Joints — an interruption of the concrete pour 30 minutes or greater creates a construction joint. Expansion Joints — Designed to negate the compressive forces from abutting concrete structures that may occur as a result of expansion, loads, or differential movement from settlement. Expansion joints require an actual gap between the concrete pours, which is frequently filled with a compressible joint filler material such as foam, rubber, cork, or cane fiber board.
Posted on: Thu, 13 Jun 2013 01:26:37 +0000
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