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

Abstract: 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: Clays | Fly ash | Slag | Soil compression | Compression tests | Compacted soils | Power plants | Industrial wastes

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