Microscopic Modeling of Colloidal Silica Stabilized Granular Contaminated Soils

Meegoda, Jay N.; Tantemsapya, Netnapid

doi:10.1061/(asce)0899-1561(2007)19:1(91)

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…It is attractive as a potential grouting material because of its strength and controllable gel time. Additionally, colloidal silica is a non-toxic and inert material (Gallagher, 2000;Gallagher and Mitchell, 2002;Meegoda and Tantemsapya, 2007;Noll et al, 1992;Yonekura and Miwa, 1993).…”

Section: Colloidal Silicamentioning

confidence: 97%

Pre- and post-cyclic loading strength of silica-grouted sand

Mollamahmutoğlu

Yılmaz

2010

Proceedings of the Institution of Civil Engineers - Geotechnica

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The aim of this study is to investigate whether there is a loss in the strength of fine-to medium-grained colloidalsilica-grouted sand after cyclic loading. First, the rheological properties of colloidal silica grouts, such as gel time and viscosity, are studied. Then, appropriate colloidal silica grouts (saline solution/colloidal silica suspension ratios of 10%, 15%, 20% and 25% by weight) are selected. The selected colloidal silica grouts are then injected into fine-to medium-grained sand specimens prepared at an overall relative density of 50%. The strength of the grouted sand specimens is determined by unconfined compression tests. The effect of curing period on the strength of the grouted samples is also investigated. After performing cyclic loading tests on grouted sand specimens at different cyclic stress ratios (0, 0 . 13, 0 . 26 0 . 39 and 0 . 52), it is observed that none of the samples failed or was damaged, and that the colloidal silica grout provides fine-to medium-grained sand with a significant resistance to cyclic deformation. The samples are then subjected to unconfined compression tests, and the results show that the loss in the strength of colloidal-silica-grouted sand is insignificant.

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Section: Colloidal Silicamentioning

confidence: 97%

Pre- and post-cyclic loading strength of silica-grouted sand

Mollamahmutoğlu

Yılmaz

2010

Proceedings of the Institution of Civil Engineers - Geotechnica

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“…Numerous researchers have developed new or modified existing codes to simulate various aspects of the flow and transport of variable‐viscosity, variable‐density gelling fluids in the saturated (e.g., Honma, 1984; Finsterle et al, 1994; Bolisetti and Reitsma, 2003) and unsaturated zones (Šimůnek et al, 2006, 2008; Kim and Corapcioglu, 2002a, 2002b). Meegoda and Tantemsapya (2008) modeled CS transport at the microscopic level to understand the mechanism of gelation.…”

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confidence: 99%

Numerical Model for Colloidal Silica Injected Column Tests

Hamderi¹,

Gallagher

Lin

2014

Vadose Zone Journal

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The UTCHEM lood simulator was used to develop a numerical model to simulate colloidal silica transport through sand columns. Most existing numerical models for colloidal silica modeling include the gelation process, in which the viscosity gradually becomes orders of magnitude greater than the initial grout viscosity. However, in ield grouting applications of shallow, loose, cohesionless deposits, injection at high viscosities may be limited due to allowable pressure limitations. In these cases, the injection is planned to be completed just before the gelling reaction begins. Thus, modeling the gelation process may not be necessary. The UTCHEM simulator accounts for luids with varying densities and viscosities, making it a useful tool for simulating colloidal silica injection in cases where gelation does not need to be modeled explicitly. The model was validated using laboratory data from ive column tests in which loose sand was treated with colloidal silica grout and one column test in which sand was treated with sodium silicate. The numerical model accurately represented the physical experiments. The numerical model provides a validated tool that can be used to design and optimize stabilizer delivery for laboratory and ield applications in which gelation does not need to be modeled explicitly.Abbreviations: CS, colloidal silica.We have developed a numerical model for simulating colloidal silica transport through sand columns using the existing reservoir simulator UTCHEM. Colloidal silica (CS) has recently been investigated for use as a grouting material to mitigate liquefaction risk at developed sites. It has been shown to reduce liquefaction risk in laboratory, centrifuge, and ield applications (e.g., Gallagher and Mitchell, 2002;Gallagher et al., 2007;Gallagher and Lin, 2009;Conlee et al., 2012). Although CS is more expensive than the more traditional sodium silicate grout, it has numerous advantages that may make it cost efective for use at developed sites. Colloidal silica nanoparticles are inert and nontoxic and can penetrate ine sands without iltration, dilute solutions (e.g., 10% w/w) have initial viscosities similar to water, and gel times can be controlled with NaCl. Barriers constructed from CS are expected to have lifetimes in excess of 25 yr (Whang, 1995); when kept saturated, they are expected to be permanent. he performance of CS in laboratory, centrifuge, and ield testing applications has been discussed extensively in the studies cited above; the purpose of this study was to design and validate a numerical model to design and optimize stabilizer delivery for laboratory and ield applications. In this research, a numerical model was developed using UTCHEM and validated using experimental results from Lin (2006), Lin (2009), andHonma (1984).Numerous researchers have developed new or modiied existing codes to simulate various aspects of the low and transport of variable-viscosity, variable-density gelling luids in the saturated (e.g.

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Experimental research on rheological and mechanical properties of nano silica sol grout

Wang

et al. 2019

J Sol-Gel Sci Technol

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Microscopic Modeling of Colloidal Silica Stabilized Granular Contaminated Soils

Cited by 5 publications

References 7 publications

Pre- and post-cyclic loading strength of silica-grouted sand

Pre- and post-cyclic loading strength of silica-grouted sand

Numerical Model for Colloidal Silica Injected Column Tests

Experimental research on rheological and mechanical properties of nano silica sol grout

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