AG Mechanics CDE Practice Exam 2025 – Comprehensive Test Prep Resource

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A groove cut into concrete to allow for expansion due to temperature changes is called an:

control joint

A control joint is a groove cut into concrete to allow for expansion due to temperature changes. This is different from an expansion joint (B), which is typically a separate piece used to create a gap between concrete slabs. An isolation joint (C) is used to separate different parts of a concrete structure to prevent cracking due to movement, not just expansion. Finally, a construction joint (D) is where two separate concrete placements meet, and is not specifically created to account for temperature changes.

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expansion joint

isolation joint

construction joint

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