Mechanical Properties of Fly Ash-Slag-Dredged Silt System Stimulated by Alkali

Abstract:

The objective of this work is to investigate the stimulation effect of the addition of alkali on the fly ash and slag for stabilizing dredged silt. Based on the test results, a viable alternative for the final disposal of dredged silt as subgrade construction materials were proposed. For this purpose, several mixtures of dredged silt-fly ash-slag and alkali were prepared and stabilized/solidified. In this system, fly ash and slag were used as hardening agents (solidified materials) of dredged silt and alkali was used as activator of fly ash and slag. The shear strength of the mixture was tested by several direct shear tests. Furthermore, X-Ray Diffraction (XRD) analysis was used to determine the hydration products of the system. The specimens were tested in order to determine the shear strength changes versus hydration time and the alkali content. It is indicated that mechanical properties of solidified silt are improved significantly by addition of fly ash and slag stimulated by alkali.

• Periodical: Advanced Materials Research (Volumes 807-809)
• Pages: 1140-1146
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.807-809.1140
• Online since: September 2013
• Authors: Yi Xuan Chen, Xiu Li Sun, Zhi Hua Li
• Keywords: Alkali Activation, Dredged Silt, Fly Ash (FA), Slag, Stabilization/Solidification

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