Evaluation of porous pavements used in Oregon : volume II : appendices.
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1994-12-01
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Abstract:Porous pavements or open graded asphalt mixtures have been in use in Oregon since the late 1960s. The use of this pavement type has increased over the years because the pores in the mat provide a better way for water to drain from the surface. This greatly increases the safety in the areas of skid resistance and splash and spray. An added benefit from these pavements is that tire noise is partly absorbed into the voids of the pavement.
The purpose of this study was to evaluate porous pavements, especially the F-mix, as they are used in Oregon. The input from inside (i.e., contractors, ODOT personnel, asphalt experts) and outside (i.e., literature published over the years from agencies in the U.S. and abroad) Oregon was used to study open-graded mixes. This information was then used for improving porous pavements in Oregon.
Laboratory and field studies were performed on Oregon's open-graded mixtures. These tests were designed to understand how the mixture types performed with Oregon's conditions. These tests included texture depth, permeability, accident analysis, skid testing, rutting, splash and spray, noise, core gradation, asphalt properties, and tack coat shear testing.
A number of of findings from this study. Porous pavements provide a 1-2 dB A-weighted roadside noise improvement when compared to B-mix pavements. This difference would not be perceptible to an individual wit average hearing. However, noticeable improvements for the F-mix did occur in the 500-4000 Hz range. Splash and spray visibility is improved, and safety on the roadway is improved. Potential problems with porous pavements include post-construction skid resistance, construction difficulties, and clogging of the pavement mat. Suggestions have been made in this study in terms of solving these problems and increasing the benefits.
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