Analysis of Permeability of Kentucky Hot Mix Pavements

Currently, the biggest issue concerning asphalt pavements in Kentucky is permeability, which has also become an important issue in other states since the introduction of coarse graded Superpave mixtures. This is due to the fact that a high permeability can result in ingress of excessive amounts of water, which potentially can cause serious problems such as frost heave, stripping, asphalt emulsification, pumping, etc. Previous research has been conducted to develop a field permeability test for asphalt concrete and aggregate bases. According to the research results, some pavements in Kentucky experience an excessive level of permeability, especially at the construction joints. However, a solid strategy for addressing this issue is not available yet. The objective of this research is to find solutions to this problem. If permeability can be effectively reduced without affecting a pavement's other desired properties, or damage caused by high permeability can be controlled, a longer pavement service life can be expected.