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Stabilization of Sulfate-Rich Expansive Soils using Metakaolin-based Geopolymer – Jungyeon Jang

Introduction

PJungyeon Jangopulation growth in the southern United States is rapidly increasing the construction of civil infrastructure on expansive soils. However, these soils cause difficulties due to the moisture-fluctuation-induced swell-shrink behavior of expansive soils. Traditional calcium-based stabilizers, such as lime and cement, that are effective in mitigating the swell-shrink potential and improve the engineering properties of expansive soils, are generally used to stabilize expansive soils. Despite these advantages, stabilization of sulfate-rich soils using the calcium-based stabilizers results in sulfate-induced heave due to the formation of a highly expansive mineral, ettringite, which is mostly observed to be counter-productive. The manufacture of calcium-based stabilizers is also not eco-friendly as it releases large amounts of carbon dioxide. This study investigates the suitability of using a metakaolin-based geopolymer as an environmentally friendly soil stabilizer for treating sulfate-rich soils. A comparative study was conducted by performing one-dimensional free swell tests on geopolymer-treated, lime-treated, and untreated soil specimens to assess the benefits of using a geopolymer in effectively stabilizing the sulfate-rich expansive soil. The results of the swell test show that sulfate-rich soil treated with a geopolymer is more effective at reducing the swelling potential than soil treated with lime. Therefore, geopolymer shows promising potential as an alternative material to traditional soil stabilizers in sulfate-rich areas.

Poster

 

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