What is a construction joint?

What is a construction joint?

• A. A type of joint in concrete structures created between two successive placements of concrete, designed to allow for natural expansion and contraction of the material while providing a defined point for structural separation or connection.
• B. A joint that connects steel rebar to concrete.
• C. A joint used to join different floors vertically.
• D. A joint that seals water intrusion.

Answer: (A)

A construction joint is a planned joint where one concrete placement ends and the next begins. It defines a specific plane for transferring loads between pours and for allowing movement that occurs as the concrete cures and due to temperature or moisture changes. In practice, these joints are designed to bond the new concrete to the old (often with dowels or keyways to keep alignment and transfer shear) while sometimes incorporating seals or waterstops to control leakage. This distinguishes it from joints that connect reinforcement to concrete, joints that join different floors vertically, or joints whose main purpose is water sealing.

A construction joint is a planned joint where one concrete placement ends and the next begins. It defines a specific plane for transferring loads between pours and for allowing movement that occurs as the concrete cures and due to temperature or moisture changes. In practice, these joints are designed to bond the new concrete to the old (often with dowels or keyways to keep alignment and transfer shear) while sometimes incorporating seals or waterstops to control leakage. This distinguishes it from joints that connect reinforcement to concrete, joints that join different floors vertically, or joints whose main purpose is water sealing.