Core TradesQuestion 172 of 700
Tooled or sawn control (contraction) joints are placed in a concrete slab-on-grade PRIMARILY to:
a.Increase the load-carrying capacity of the slab
b.Provide a decorative surface pattern
c.Allow the slab to expand upward during hot weather
d.Control where shrinkage cracking occurs by creating planned weak planes
Explanation
Control joints create planned weakened planes so drying-shrinkage cracks form neatly along the joint rather than randomly across the slab. They do not add structural capacity, are not primarily decorative, and are for shrinkage control rather than upward expansion.
Law Reference: 2025 CA Building Code, Chapter 19 (Concrete)Practice all 700 questions free — no signup required.
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