Excess concrete in the Joint area
This is the concrete that will flows around the stop-end during the construction process and then solidify on the other side of the stop end. This changes the properties between the primary and the secondary panels.
If excess concrete manages to get behind the stop-end, then the quality and the geometry of this concrete becomes an unknown. This is the reason that the joint construction was created for, with a set of criteria that need to be met in order to create a strong seal between panels. If enough excess concrete manages to run past the end-stop, it can prevent the grab from moving along its intended path which can have massive effects of the orientation and geometry of the panels. In addition, the excess concrete can also prevent the complete exchange of the slurry fluid with the fresh concrete, which happens because parts of the slurry fluid get trapped in the end-stop profile due to the excess concrete.
