Stabilization of Sand with Colloidal Nano-Silica Hydrosols

Article


Ghadr, S., Assadi Langroudi, A., Hung, C., O’Kelly, B. C., Bahadori, H. and Ghodsi, T. 2020. Stabilization of Sand with Colloidal Nano-Silica Hydrosols. Applied Sciences. 10 (Art. 5192). https://doi.org/10.3390/app10155192
AuthorsGhadr, S., Assadi Langroudi, A., Hung, C., O’Kelly, B. C., Bahadori, H. and Ghodsi, T.
Abstract

Colloidal nano-silica (NS) hydrosols are electrochemically stabilized, polymerized amorphous silica in low viscosity solutions, and in the form of hydrated gels, silica globules or pellicles. Compared to applications in concrete technology, the use of silica-based binders for groundwork applications has received little attention. Silica-based hydrosols impose no known direct risks to humans and are generally courteous to the soil health and ecosystem service functions. Their localized impact on microorganisms however needs to be further investigated. To this end, NS hydrosols have a scope for use as an alternative low-viscose material in groundworks. The current understanding of interactions between NS hydrosols and soil (sand) is, however, confused by the limited availability of experimental evidence concerning undrained static flow and large strain behavior. The contributions, presented in this paper, advance the knowledge through experimental testing, molecular modelling, and micro-analytical measurements. Four grades of colloidal NS (1–15 wt.%) were synthesized for grouting medium-dense sub-angular fine siliceous sand specimens. Consolidated-undrained triaxial compression testing was performed on the base and treated sand for isotropic consolidation over the effective stress range 100–400 kPa. Overall, silica impregnation produced improvements in yield and residual undrained shear strengths, restricted unwelcomed impacts of excess pore water pressure, and led to the formation of generally more dilative, strain-hardening behavior. Steady states and static flow potential indices are also studied as functions of confinement level and viscosity of the NS grout.

JournalApplied Sciences
Journal citation10 (Art. 5192)
ISSN2076-3417
Year2020
PublisherMDPI
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Anyone
Digital Object Identifier (DOI)https://doi.org/10.3390/app10155192
Web address (URL)https://doi.org/10.3390/app10155192
Publication dates
Online28 Jul 2020
Publication process dates
Accepted20 Jul 2020
Deposited28 Jul 2020
FunderMinistry of Sciences and Technology, Taiwan
Copyright holder© 2020 The Authors
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