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Stabilization of Sand with Colloidal Nano-Silica Hydrosols
| Content Provider | MDPI |
|---|---|
| Author | O’Kelly, Brendan Ghadr, Soheil Assadi-Langroudi, Arya Hung, Ching Bahadori, Hadi Ghodsi, Taher |
| Copyright Year | 2020 |
| Description | 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. |
| Starting Page | 5192 |
| e-ISSN | 20763417 |
| DOI | 10.3390/app10155192 |
| Journal | Applied Sciences |
| Issue Number | 15 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-07-28 |
| Access Restriction | Open |
| Subject Keyword | Applied Sciences Geological Engineering Compensation Grouting Flow Nano-silica Sand Steady-state Undrained Compression |
| Content Type | Text |
| Resource Type | Article |
