AL Concrete Practice Questions - Alabama Concrete Contractor Examination Exam

Isolation joints around columns or walls in a slab-on-grade are intended to:

Bond the slab rigidly to the column for composite action always Separate the slab from fixed elements so independent movement does not cause cracking Increase the coefficient of friction to the subgrade Replace the vapor retarder

Correct Answer:

Separate the slab from fixed elements so independent movement does not cause cracking

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