Brick pavers are frequently used for crosswalks and pavement accents. Over time and traffic, we have seen pavers shift. The pavers in the photograph have been pushed in the direction of traffic (to the right). The center, herringbone pattern shifted causing the running bond border to become loose. There is about an inch total movement between the PCC border and the pavers.
This situation can be avoided by using a polymer-modified sand to fill the void space between pave bricks. The modified sand is spread over the pavers and a plate compactor vibrates the sand into the void space. The excess sand is swept away, and the surface is wetted. The water activates the polymer causing a gluing action. This hold the sand in place and binds the pavers.
Zimmer Consultants photograph