Not to be confused with Wikipedia’s definition of a chemistry based triple bond. In the epoxy floor coating industry, when referring to a triple bond it is referring to the bonding of the actual control joint on all 3 sides. By bonding the concrete on all 3 side you are essentially creating one solid slab versus 2 separate movable slabs.
The images below give you a detailed side view a concrete slab with a control joint in the center. The numbers 1,2, and 3 represent each side of the control joint.
Triple Bonded Exists (bonded on all 3 side)
Triple Bond Non-existent