Stabilization of Sand with Colloidal Nano-Silica Hydrosols
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...
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MDPI AG
2020-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/15/5192 |
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| author | Soheil Ghadr Arya Assadi-Langroudi Ching Hung Brendan C. O’Kelly Hadi Bahadori Taher Ghodsi |
| author_facet | Soheil Ghadr Arya Assadi-Langroudi Ching Hung Brendan C. O’Kelly Hadi Bahadori Taher Ghodsi |
| author_sort | Soheil Ghadr |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T18:09:32Z |
| format | Article |
| id | doaj.art-d1c59611f6fb4ff9a4e0e3b0a4e6ac42 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T18:09:32Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-d1c59611f6fb4ff9a4e0e3b0a4e6ac422023-11-20T08:14:46ZengMDPI AGApplied Sciences2076-34172020-07-011015519210.3390/app10155192Stabilization of Sand with Colloidal Nano-Silica HydrosolsSoheil Ghadr0Arya Assadi-Langroudi1Ching Hung2Brendan C. O’Kelly3Hadi Bahadori4Taher Ghodsi5Department of Civil Engineering, Urmia University, Oroumieh 5756151818, IranDepartment of Computing and Engineering, University of East London, London E16 2RD, UKDepartment of Civil Engineering, National Cheng Kung University, Tainan 701, TaiwanDepartment of Civil, Structural and Environmental Engineering, Trinity College Dublin, Dublin 2, Eircode D02 Dublin, IrelandDepartment of Civil Engineering, Urmia University, Oroumieh 5756151818, IranDepartment of Civil Engineering, Urmia University, Oroumieh 5756151818, IranColloidal 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.https://www.mdpi.com/2076-3417/10/15/5192compensation groutingflownano-silicasandsteady-stateundrained compression |
| spellingShingle | Soheil Ghadr Arya Assadi-Langroudi Ching Hung Brendan C. O’Kelly Hadi Bahadori Taher Ghodsi Stabilization of Sand with Colloidal Nano-Silica Hydrosols Applied Sciences compensation grouting flow nano-silica sand steady-state undrained compression |
| title | Stabilization of Sand with Colloidal Nano-Silica Hydrosols |
| title_full | Stabilization of Sand with Colloidal Nano-Silica Hydrosols |
| title_fullStr | Stabilization of Sand with Colloidal Nano-Silica Hydrosols |
| title_full_unstemmed | Stabilization of Sand with Colloidal Nano-Silica Hydrosols |
| title_short | Stabilization of Sand with Colloidal Nano-Silica Hydrosols |
| title_sort | stabilization of sand with colloidal nano silica hydrosols |
| topic | compensation grouting flow nano-silica sand steady-state undrained compression |
| url | https://www.mdpi.com/2076-3417/10/15/5192 |
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