Constructing a porous asphalt pavement is no more challenging than constructing a dense graded pavement, but is different in that more attention must be paid to keeping the air voids open. Some tips for the field:
- First, excavating must be done with tracked or lightly loaded equipment in order to prevent subgrade compaction.
- Geotextiles must go down immediately after fine grading of the subgrade.
- Single-sized base aggregate must be clean and washed, and only lightly compacted – don’t use vibration!
- A choker course is recommended, as it will provide a more stable base for paving.
- After these crucial steps, paving can be done much as usual, but consider a tracked paver and make sure to keep equipment off the aggregate base as much as possible.
Open graded, washed aggregate base with keys for scale
To learn more about construction or techniques for designing your mix, check out:
