Use of Coal Fly Ash and Other Waste Products in Soil Stabilization and Road Construction Including Non-Destructive Testing of Roadway

摘要

Beneficial use of coal fly ash has an overall economic and environmental benefit. Fossil fuel power plans produce large quantity of coal fly ash each year. These fly ashes mostly disposed of in landfills and ponds. Nationwide, only approximately 40% of coal fly ashes are beneficially used. The use of fly ash in road subgrade applications can provide better properties and performance, and is superior to it being otherwise disposed and becoming a possible environmental liability. Meanwhile, the Missouri Department of Transportation (MoDOT) is also looking for non-destructive testing methods to evaluate the effectiveness of these materials in strengthening the road subgrade which can enhances inspection of other areas of roadwork. In the proposed research, we will firstly identify waste products, including coal fly ash and lime kiln dust, in soil stabilization to reduce the cost while enhancing road construction. Secondly, we will develop innovative non-destructive testing technologies to evaluate the physical and engineering properties of the stabilized subgrade, subbase and base materials and provide a guideline of use of fly ash and other waste products in Missouri.