In joint detailing, the interlocking feature across a concrete joint by engaging a recess is called the what?

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Multiple Choice

In joint detailing, the interlocking feature across a concrete joint by engaging a recess is called the what?

Explanation:
Interlock across a concrete joint is provided by a key. The key is a recessed groove in one member that accepts a projection on the adjoining member, creating a mechanical connection that resists horizontal movement and helps transfer shear across the joint. This is different from a dowel, which is just a reinforcing rod crossing the joint to transfer load without engaging a recess; a lip is typically just an edge detail, and a seal serves waterproofing rather than interlocking the slabs. So the feature described by engaging a recess and forming an interlock is a key.

Interlock across a concrete joint is provided by a key. The key is a recessed groove in one member that accepts a projection on the adjoining member, creating a mechanical connection that resists horizontal movement and helps transfer shear across the joint. This is different from a dowel, which is just a reinforcing rod crossing the joint to transfer load without engaging a recess; a lip is typically just an edge detail, and a seal serves waterproofing rather than interlocking the slabs. So the feature described by engaging a recess and forming an interlock is a key.

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