A long CMU corridor wall has no control joints shown near a re-entrant corner, and shrinkage cracking is likely to concentrate there. What is the best preconstruction action?
Correct Answer
C) Coordinate the control-joint layout with the designer before laying the affected wall
Raise the concern with the designer before construction and resolve the intended crack-control detail. Joint placement must work with reinforcement, wall function and expected movement. Do not cut reinforcement or replace structural mortar with caulk indiscriminately. Concrete masonry can undergo shrinkage; simply waiting for a crack is not a design resolution. Source: https://www.cmha.org/resource/cmu-tec-009/
Why This Is the Correct Answer
Raise the concern with the designer before construction and resolve the intended crack-control detail. Joint placement must work with reinforcement, wall function and expected movement. Do not cut reinforcement or replace structural mortar with caulk indiscriminately. Concrete masonry can undergo shrinkage; simply waiting for a crack is not a design resolution. Source: https://www.cmha.org/resource/cmu-tec-009/
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