Tran-SET 2020
Stabilizing Sandy Silt Soil with Fly-Ash Based RCA Geopolymer in Pavement Base Layers
Publication: Tran-SET 2020
ABSTRACT
Silty soils originally found onsite or borrowed can be problematic in nature particularly in its liquefied state and this may affect the service life of any pavement layer. Cement stabilized soil, using ordinary Portland cement (OPC), is traditionally utilized to stabilize such soils to enhance its strength. Clearly, several environmental issues have stemmed from the use of OPC wherein a more sustainable material with a low carbon footprint has generated lots of interest in present climes. In recent decades, fly ash has become more abundant in nature solely because of its constant disposal as a byproduct from industrial plants. However, when mixed with soil under alkali activation, it tends to form geopolymers and this has been studied to be at par or greater in strength than cement stabilized soil (CSS) and other chemical stabilizers. Therefore, this research proposes the use of fly-ash-based geopolymer with recycled concrete aggregates (RCA) as a stabilizer for sandy silt road base material. A low calcium fly ash was applied on sandy silt soil to obtain an effective mix that would enable soil to be stabilized for road base use. The fly ash-based soil geopolymer specimens were tested for unconfined compressive strength (UCS), resilient modulus (Mr), durability, and indirect tensile strengths. Results have shown geopolymer-stabilized sandy silt soil to have greater improvements in strength and durability as compared to CSS.
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Published In
Tran-SET 2020
Pages: 76 - 86
Editors: Craig Newtson, Ph.D., New Mexico State University, Susan Bogus Halter, Ph.D., University of New Mexico, and Marwa Hassan, Ph.D., Louisiana State University
ISBN (Online): 978-0-7844-8330-5
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© 2021 American Society of Civil Engineers.
History
Published online: Jan 12, 2021
Published in print: Jan 12, 2021
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