A Study of Engineering Properties of a Clay Modified by Ash and Slag

by Shi-Chih Chu, Tamkang Univ, Tamsui, Taiwan,
Hsiang-Sheng Kao, Tamkang Univ, Tamsui, Taiwan,

Document Type: Proceeding Paper

Part of: Fly Ash for Soil Improvement


Fly ash from power plants and slag from steel mills are two industrial solid wastes. These wastes can be utilized as soil stabilizers. In this study, a clay with low plasticity is mixed with 12 different proportions of fly ash and slay. The fly ash and slag contents range from 0 to 20 percent and 0 to 10 percent, respectively, on the dry weight basis. Laboratory investigations include compaction, unconfined compression triaxial consolidated undrained, and one dimensional consolidation test. Adding fly ash and slag to the clay results a decrease of maximum dry density and an increase of optimum water content of that clay, obtained in a standard Proctor compaction test. Results from the consolidation test indicate that additives have about the same compressibility effects on the clay. The compression indices and swell indices of clay-additive mixtures are about 18% to 36% and 40% to 60%, respectively, of the clay.

Subject Headings: Soil properties | Soil compression | Compacted soils | Clays | Ashes | Slag | Power plants | Soil mixing

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