Another Case Cracked

摘要

Look down on Illinois from the air and you might think the state has lots of asphalt roads. What you can't see is that underlying the asphalt is a concrete base. The state has a historical belief in concrete pavement. Nearly all of the state's highways were originally built with concrete. Over the past three decades, as the concrete pavement has aged and cracked at the surface, the state has fixed the concrete with patches and asphalt overlays to extend the pavement's life. Finally, about a 20-mile segment of I-70 in eastern Illinois had too much deep, age-related damage to be repaired; it had to be reconstructed.