Stiffening of Clay by the Use of Paper Fly Ashes

Volume 2 - Issue 5

Herman Peiffer*

Received: May 27, 2019;   Published: June 06, 2019

DOI: 10.32474/OAJESS.2019.02.000150

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Abstract

To improve the stiffness and bearing capacity of natural soils, traditionally lime or cement is used. This research focuses on the performance of an industrial residual product paper fly ash (generally treated as waste) as an alternative binder for soil stabilization. The present report summarizes the research carried out at the Ghent University. The research focused on the stabilization of kaolinite and bentonite clay. The experimental research consisted on monitoring the evolution of stiffening by time of a number of soil samples mixed with paper fly ashes. To this end, a non-destructive test was implemented to evaluate the small-strain stiffness of each specimen at different stages of curing. Kaolinite clay was chosen as reference clay material for stabilization. A commercial processed kaolin Rotoclay HB (Goonvean, St. Austell, UK) was used in this investigation. Kaolinite shows relatively low plasticity levels comparable to commonly found fine-grained soils. The non-destructive free resonant column test was used to evaluate the small-strain Young’s modulus (E0 ) of the soil specimens after stabilization with paper fly ash. The limited scatter of data suggests good repeatability and reliability. The first conclusions with regard to the application for soil stabilization are discussed.

Keywords: Soil Improvement; Paper Fly Ashes; Lime; Kaolinite; Bentonite; Free Resonant Column Test

Abstract| Introduction| Materials and Methods| Results and Discussion| Conclusion| References|