Gravel Roads - Sargent County Township Meeting
The Gravel Roads presentation helps local leaders understand aspects of gravel roads. A review of roadway shape, aggregate gradation, clay binder, roadway problems/solutions provides a solid foundation of knowledge for anyone wanting to understand how to improve gravel roadways. Clay binder is a focal point for the technology transfer. To insure that a quality gravel is purchased, a gravel needs to be specified and tested for gradation and PI. PI, plasticity index, is the engineering property that defines the amount of clay in the fine portion of the gravel material. Clay is the binder that holds gravel rock and fines together, much like cement in concrete. Gravel produced without clay will result in roadway sections that yield excessive dust, wash-boarding and float; items that result in increased life cycle costs and reduced safety levels. Contact NDLTAP if your group can benefit from quality gravel roads. NDLTAP is offering the presentation to local leaders across the state.
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Gravel Roads - Sargent County Township Meeting
- 1. Gravel Roads Sargent County Township Meeting December 2, 2015 Dale Heglund, PE/PLS, NDLTAP Director North Dakota Local Technical Assistance Program
- 2. Checklist
- 4. 2% is ¼’’ per foot 4% is ½’’ per foot 2% for future pave 4% for unpaved
- 9. High shoulders – Do not allow “berms” “curbs ” The engineering term is “secondary ditch” pg. 9
- 15. Brooking Section – Loose Aggregate 0 20 40 60 80 100 120 140 160 180 200 Tons per mile (October 2013) 186 tons 16 tons
- 17. Pretend Blading
- 18. 1 vehicle 1 year 1 ton dust per mile Each mile with 100 cars per day = 100 tons of fines per year!
- 22. Subject Expert Jon Mill, PE/PLS Presentation Author: Dale C. Heglund, PE/PLS, NDLTAP Director – November 2015
- 24. North Dakota Truck Weight Calculator
- 27. Gravel Roads Sargent County Township Meeting December 2, 2015 Dale Heglund, PE/PLS, NDLTAP Director North Dakota Local Technical Assistance Program