What is a keyway in concrete?

What is a keyway in concrete? KEYWAY is a lightweight, flexible, tongue and groove joint made from PVC. KEYWAY is resistant to impact and warping. Simply nail or staple KEYWAY to the form or header prior to pouring the concrete. After the concrete sets, KEYWAY can be stripped easily to be reused, or it can be safely left in place.

What is the purpose of keyway in concrete? The keyway will act as the slab edge for the pour. When forces push one slab vertically from the other, the keyway construction joint will hold the two slabs together. Keyways are typically applied in commercial settings.