Q: Why does asphalt and concrete pavers (interlock) develop potholes or cracks?
A; Asphalt develops potholes because the material has an elastic and soft structure. when vehicles are parked in one area the weight of the vehicle pushes into the soft elastic structure, creating a pothole. Asphalt develops cracks because no control joints have been made so any movement in the earth with crack the asphalt.
Concrete pavers (interlock) develop potholes because the interlock do not connect as one solid slab. When there is small concrete pavers (interlock) and they aren't poured together, hundred of voids are created between the concrete pavers ( interlock). The voids between each paver allows water to enter and start to erode the gravel under the pavers. Once one small hole has developed water will continue to compromise the base under the concrete pavers. Water going into the base under the pavers creates potholes and an area for weeds to flourish.