Abstract
Current soil stabilization methods are often limited by durability and leaching issues and do not always offer sustainable treatments. This research explores the use of geopolymers to stabilize clays in the North Texas area. In recent years, geopolymer has received much attention as an eco-friendly and sustainable alternative to conventional chemical additives, since it can be processed at room temperature from aqueous solutions by utilizing waste materials and/or abounded natural sources. Two subgrade soils from North Texas were treated with GP mix at a ratio of 8 wt% dry GP to dry soil. GP is shown to reduce swelling and shrinkage potential of soil considerably while an increase in unconfined compressive strength is observed as well. Therefore, further studies are recommended to understand the mechanism of GP and soil bonding resulting in said changes.
Highlights
Transportation infrastructure in Texas and its neighboring states has been frequently built on highly compressible soils, which lack the strength to support structures during their construction or service life
The Linear shrinkage tests were conducted on treated CL treated and cured specimen were observed to disintegrate as well as CH samples, both of which indicated that GP and slake when soaked in water
This pilot study explores the use of metakaolin-based geopolymer for the stabilization of native North Texas subgrade soils
Summary
Transportation infrastructure in Texas and its neighboring states has been frequently built on highly compressible soils, which lack the strength to support structures during their construction or service life. Chemical stabilization techniques using cementitious materials and polymers have been used to increase strength and stiffness properties of these soils. These chemical stabilization techniques are widely used, they are limited by durability and leaching issues, resulting in infrastructure failure. Currently used soil stabilizers do not offer sustainable and eco-friendly treatments. There is a need for new and improved ground improvement solutions that are sustainable, durable, and enhances the engineering properties of soils for transportation infrastructure.
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