A Macro/Micro Structural Study of the Seawater Effect on the Process of Stabilizing Clay Soils with Lime and Nano-SiO2

Document Type : Research Article

Authors

1 Department of Civil Engineering, Faculty of Engineering, University of Hormozgan, Bandar Abbas, Iran.

2 Assistant Prof., Faculty of Engineering., Hormozgan University

3 M.Sc. of Geotechnical Engineering, Faculty of Engineering., University of Hormozgan, Bandar Abbas, Iran

Abstract

There is a large number of restrictions in the application of soil consolidation processes in many coastal areas due to the lack of fresh water. Besides, further studies are required on the effects of using saline water on soil improvement due to the widespread of saline water at the land surface. Therefore, in this paper, several macro/microstructural experiments were carried out to study the effect of ions in the seawater on the chemical stabilization process of clay soils with lime and nano-silica to stabilize kaolinite clay from varying amounts of lime, nano-silica, distilled water, and Persian Gulf water. A kaolinite clayey sample was cured with different amounts of lime and nano-silica. Accordingly, grain tests, Atterberg limits, pH changes, and changes in the uniaxial compressive strength over time were taken into account to evaluate the microstructures of X-ray diffraction analysis and to scan the electron microscopy images. Uniaxial compressive strength results indicated improvement in the samples without additives made with the seawater compared to the samples made with the distilled water. Additionally, the resistance of the samples mixed with the seawater increased by 4% compared to the samples mixed with the distilled water with 28-day curing, while the samples were modified with 6% lime.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 2
May 2021
Pages 675-686

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