Looking inside surface layers helps predict longevity

摘要

Research to help predict maintenance needs for open-graded porous asphalt (OGPA) pavements has found that New Zealand's unique multiple-overlay approach is not ideal from a structural point of view. Much of New Zealand's road network is now well developed, and the focus has shifted to improving and maintaining existing roads. Effective maintenance requires a sound understanding of the behaviour and performance, under loading, of the various materials that make up the pavement structure and surface.