Type C Fly Ash and Clay Stabilization

by John H. Lamb, Kansas City Testing Lab, KS, USA,

Document Type: Proceeding Paper

Part of: Developments in New and Existing Materials


Because the soils onsite have a high swell potential, a 37 foot high retaining wall was designed with counterforts and was supported by pier foundations to limestone. In order to reduce the lateral earth pressures on the wall a sufficient amount to eliminate both the counterforts and the piers, a laboratory study was carried out using two Type C fly ashes to stabilize the backfill soils. The two Type C fly ashes came from different Kansas City Power & Light plants that have similar designs and operate similarly. However, the influence of the two ashes on the mechanical properties of local weathered shales and silty clays is significantly different.

Subject Headings: Soil stabilization | Soil strength | Soil properties | Fly ash | Clays | Retaining structures | Soil pressure | Kansas | United States

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