SUMMARY OF WORKSHOP SESSION ON DRAINAGE MATERIALS--DES MOINES, IOWA
This paper summarizes the work session on drainage materials held at the 1973 Federal Highway Administration workshop on Water in Pavements in Des Moines, Iowa. Iowa uses a base of dense-graded bituminous-stabilized aggregate that is able to endure the presence of water and is more economical than a drained pavement structure. They selectively grade for frost heave problems. Nebraska uses a cement-treated 3-in. (7.6-cm) base when average daily traffic exceeds 2,700. For lighter traffic, an untreated 4-in. (10-cm) granular base is specified. Indiana specifies a dense-graded bituminous-stabilized 4-in. (10-cm) base. Illinois specifies a dense-graded asphalt-stabilized base for all flexible pavements, and a similar material is constructed as a subbase material for both rigid and flexible pavements. North Dakota constructs a dense-graded asphalt-stabilized base beneath their pavements. Ohio uses 6 in. (15 cm) of granular material under their rigid pavements, in conjunction with an edge drain system. Michigan specifies a 10-in. (25.4-cm) sand subbase in addition to a 4-in. (10-cm) gravel base beneath rigid pavements. The subbase is daylighted to the slope. North Dakota uses both 6-in. (15-cm) and 8-in. (20-cm) perforated, corrugated, metal pipe (PCMP), with sand or gravel filter material surrounding the pipe. Missouri specifies either steel or aluminum pipe, screening the outfall end. PCMP is the primary specification in Iowa, with the filter material placed around the pipe being well-graded. Concrete is the most popular type of pipe used in Ohio. The typical installation in Nebraska is a concrete sand filter surrounding PCMP. Michigan uses an 18 in. (46 cm) wide trench, 5 ft (1.5 m) deep.
- This paper was presented at a 1973 workshop on Water in Pavements sponsored by the Federal Highway Administration, held in Des Moines, Iowa.
Washington, DC United States 20590
- Coleman, T A
- Publication Date: 1973
- Pagination: p. 267-270
- TRT Terms: Aggregates; Average daily traffic; Base course (Pavements); Bituminous aggregates; Cement treated soils; Corrugated pipe; Drainage; Drainage practices; Drainage structures; Edge drains; Filter fabric; Filters; Flexible pavements; Frost heaving; Granular bases; Metal pipe; Pavements; Perforated pipe; Pipe; Rigid pavements; Stabilized materials; Subbase (Pavements); Subbase materials; Water; Workshops
- Uncontrolled Terms: Daylighting
- Geographic Terms: Illinois; Indiana; Iowa; Michigan; Missouri; Nebraska; North Dakota; Ohio
- Subject Areas: Design; Geotechnology; Highways; Hydraulics and Hydrology; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I26: Water Run-off - Freeze-thaw;
- Accession Number: 00792269
- Record Type: Publication
- Files: TRIS, USDOT
- Created Date: May 6 2000 12:00AM