OPEN-GRADED AGGREGATE DRAINAGE UNDER PAVEMENTS
It is the author's contention that pavement design criteria have been misdirected in recent years. The emphasis has been on dense graded bases intended to resist water damage rather than on adequate drainage. Since the life-span of pavements subjected to traffic loads is drastically reduced in the presence of free water (no matter how "stout" or strong its design), the result has been poorly drained pavements deteriorating at an alarming rate througout the world at consideable cost. As an alternative, the author proposes a subsurface drainage system with 5 essential components: an open-graded base drainage layer with 5 essential components; an open-graded base drainage layer with sufficient transmissibility (permeability X thickness) to remove all of the water reaching it without build-up of saturation, and sufficient permeability to allow free water to escape before it can freeze (cold climates); a suitable subbase or filter course under the open-graded layer to prevent soil intrusion and blockage of the drainage layer; suitable collector pipes; adequate outlet pipes at close enough intervals to remove all of the water to safe discharge points; and marker posts to "flag" the locations of outlets and to protect them from damage from mowers and other maintenance equipment and operations. Several pavements constructed from 1947 on cited as examples of successful drainage systems.
- Presented at the 64th Annual Convention National Sand and Gravel Association, Houston, Texas, January 29, 1980.
National Sand und Gravel Association900 Spring Street
Silver Spring, MD United States 20910
- Cedergren, H R
- Publication Date: 1980-1
- Features: Figures; References;
- Pagination: 19 p.
- TRT Terms: Defects; Deterioration; Drainage structures; Open graded aggregates; Pavement distress; Pavement layers; Pavements; Pipe; Subdrains; Surface drainage
- Uncontrolled Terms: Outlets
- Old TRIS Terms: Drainage systems; Highway drainage; Subsurface drainage systems
- Subject Areas: Geotechnology; Highways; Pavements;
- Accession Number: 00314662
- Record Type: Publication
- Report/Paper Numbers: NSGA No. 125
- Files: TRIS
- Created Date: Feb 18 1981 12:00AM