Reinforcing concrete sidewalks with wire mesh helps to bridge over
small imperfections in the subgrade. This lessens the likelihood that
sinkholes will develop. Concrete sidewalks can be replaced in sections
that mesh together nicely, although the color does not always match (few
materials do). The design life of concrete is approximately 30 years.
This means that over a 30-year period, the entire sidewalk system in a
given property will need to be removed and replaced. Usually it will be
done in sections over time.