What is the primary function of a keyway in concrete construction?

What is the primary function of a keyway in concrete construction?

• A. Check the line and grade
• B. Make an entry into an old brick sewer
• C. Divert water from a sewer that is being repaired
• D. Bond freshly poured concrete to concrete that has already set up

Answer: (D)

The primary function of a keyway in concrete construction is to bond freshly poured concrete to concrete that has already set. A keyway is a groove or notch that is formed in a concrete surface to help ensure a mechanical interlock between the new and existing concrete. This interlock is crucial for maintaining the structural integrity of the joint and preventing separation between the two concrete sections as they undergo stresses and movements. When fresh concrete is poured into a keyway, the fresh concrete fills the groove, creating a more robust connection than a smooth surface would provide. This enhances the overall strength of the construct and helps to minimize potential cracking or failure along the joint where the two sections meet. Such techniques are vital in various construction applications, including foundations, slabs, and retaining walls, ensuring durability and long-lasting performance.

The primary function of a keyway in concrete construction is to bond freshly poured concrete to concrete that has already set. A keyway is a groove or notch that is formed in a concrete surface to help ensure a mechanical interlock between the new and existing concrete. This interlock is crucial for maintaining the structural integrity of the joint and preventing separation between the two concrete sections as they undergo stresses and movements.

When fresh concrete is poured into a keyway, the fresh concrete fills the groove, creating a more robust connection than a smooth surface would provide. This enhances the overall strength of the construct and helps to minimize potential cracking or failure along the joint where the two sections meet. Such techniques are vital in various construction applications, including foundations, slabs, and retaining walls, ensuring durability and long-lasting performance.