A slab control-joint layout is omitted for a large flatwork pour. What problem is the superintendent trying to reduce by adding a layout?
Correct Answer
C) Random shrinkage cracking.
Planned contraction joints create locations for shrinkage cracks, reducing uncontrolled random cracking. They do not eliminate all cracking or replace proper concrete placement and curing. NRMCA CIP 6 explains the distinction between contraction, isolation and construction joints. Source: https://www.nrmca.org/wp-content/uploads/2021/01/06pr.pdf
Why This Is the Correct Answer
Planned contraction joints create locations for shrinkage cracks, reducing uncontrolled random cracking. They do not eliminate all cracking or replace proper concrete placement and curing. NRMCA CIP 6 explains the distinction between contraction, isolation and construction joints. Source: https://www.nrmca.org/wp-content/uploads/2021/01/06pr.pdf
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