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

Wang, Pengcheng; Li, Shu-Chen; Li, Yang; Feng, Xianjin; Xie, Can; Wan, Zeen; Wang, Manling; Zhou, Huiying; Ma, Pengfei

doi:10.1007/s10971-019-04994-5

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…Many researchers have explored the influence of pH and temperature on sol coagulation and gelation. [14][15][16] By changing the pH and temperature of the sol, the system can alleviate the adverse effects of these two factors on sol stability. In addition, in products with NSS as the primary raw material, electrolytes are added to the sol to improve the application performance.…”

Section: Introductionmentioning

confidence: 99%

Effects and mechanisms of anion and cation on the gelation of nanosilica sol by all-atom molecular dynamics simulation: promotion or inhibition?

Zhang¹,

Wen²,

Zhang³

et al. 2023

Soft Matter

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Section: Introductionmentioning

confidence: 99%

Effects and mechanisms of anion and cation on the gelation of nanosilica sol by all-atom molecular dynamics simulation: promotion or inhibition?

Zhang¹,

Wen²,

Zhang³

et al. 2023

Soft Matter

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“…Grouting is an effective technical way for the construction of deep tunnels in unfavorable geological conditions [5][6][7]. Due to nanoparticle size, low viscosity, high injectability, and friendly to ecological environment, silica sol grouting has been widely used in petroleum engineering, groundwater protection engineering, tunnel construction, nuclear waste storage, liquefiable soil improvement, and other geotechnical fields [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [10,12] investigated the rheological properties of nanosilica sol grout and derived an equation of realtime viscosity and permeability length. Fujita and Kobayashi [13] studied the transport mechanism of colloidal silica in unsaturated sand and the effect of charging properties of sand and silica particles by sand column experiment.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Nanosilica Sol Grouting for Deep Tunnels Based on the Multifield Coupling Mechanism

Pan

Hong²,

et al. 2021

Geofluids

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Grouting is an effective technical way for the construction of deep tunnels in unfavorable geological conditions. The fluid-solid-chemical coupling mechanism of grouting process is analyzed from the following three aspects: influence of physical properties of silica sol on permeability coefficient, dynamic changes of porosity and permeability of geotechnical media with seepage pressure, and governing equations for flow and mass transfer characteristics. A dynamically changing model for nanosilica sol grouting in deep tunnels is established, considering the changing physical properties of grout and surrounding rock. Based on the Xianglushan Tunnel of Yunnan Water Diversion Project, the temporal and spatial evolution of silica sol grout is studied. The effect characteristics of grouting pressure and initial permeability are clarified. The rationality of this model is verified by classical Newtonian fluid grouting theory. The main conclusions: with the molar concentration as the index, the grout range can be divided into the raw grout region and the transition region; with the decrease of the grouting pressure, the growth rate of the normal grouting radius and the axial grouting radius will gradually decrease; due to the mechanical dispersion and molecular diffusion, the range of the transition region will gradually increase with time. The ratio of the transition region to grouting radius fluctuates slightly with time under the initial permeability of 5 D. The fluctuation increases with the decrease of initial permeability, and the average ratio increases with the decrease of grouting pressure. This study can provide theoretical guidance for grouting design of deep tunnel engineering.

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“…Sui et al studied the process of dynamic water grouting for horizontal fissures and analyzed the influencing factors of chemical grout in dynamic water plugging . Wang et al investigated the effects of temperature and accelerant concentration on the gel time of silica sol slurry, and the relation between the real-time consistency of silica sol and the real-time penetration length was described. , Shen et al found that the logarithm of the sol–gel time of silicon depends on the concentration of the accelerant . Funehag et al established a prediction model of the one-dimensional flow of silica sol slurry in microcracks (40–50 μm wide) .…”

Section: Introductionmentioning

confidence: 99%

“…24 Wang et al investigated the effects of temperature and accelerant concentration on the gel time of silica sol slurry, and the relation between the real-time consistency of silica sol and the real-time penetration length was described. 25,26 Shen et al found that the logarithm of the sol−gel time of silicon depends on the concentration of the accelerant. 27 28 To explore the slurry diffusion process in fissures, Kim et al proposed a method to predict the diffusion form of cement-based slurry with time-varying viscosity in porous media.…”

Section: Introductionmentioning

confidence: 99%

Fissure Grouting Mechanism Accounting for the Time-Dependent Viscosity of Silica Sol

et al. 2021

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Subject to the complex hydrogeological environment where underground engineering is located, the grouting prevention and control of microfissure water ingress are increasingly strict. Silica sol grout has been increasingly used in field tests because of its fine particles and good injectability. Therefore, it is necessary to examine the time-dependent viscosity of silica sol grout and clarify its diffusion law in a rock fissure. In this study, the time dependence of the viscosity of silica sol grout was studied, and then the grout viscosity was subdivided into a slow growth period, accelerated growth period, and rapid curing period according to the growth rate. The effects of the concentration of colloidal silica suspension, the concentration of accelerant, and the mixing volume ratio of the two on the growth of the slurry viscosity were studied. A parameter λ was introduced to comprehensively characterize the influence of the three factors on the rheological properties of the slurry. The relationship between the gel induction time and λ and the accelerating growth stage of the slurry gel was obtained by data fitting. The time-dependent equation of the silica sol solution was established. The difference in the grouting diffusion law between silica sol grout and cement− sodium silicate grout (C-S grout) is compared and analyzed by a stepwise calculation method under two grouting modes (constantpressure grouting and constant-rate grouting). The results show that under the condition of constant-pressure grouting, the silica sol grout migrates and diffuses continuously for a long time, while the C-S grout is close to the final diffusion form at 15−20 s, and the maximum diffusion distance is much smaller than that of silica sol grout. Under the condition of constant-rate grouting, the grouting pressure driving C-S grout increases sharply with time. Compared with C-S grout, silica sol grout has the obvious advantages of a longer effective diffusion time and lower energy consumption. The research results have certain theoretical significance and reference value for the engineering design of silica sol grouting.

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

Cited by 11 publications

References 21 publications

Effects and mechanisms of anion and cation on the gelation of nanosilica sol by all-atom molecular dynamics simulation: promotion or inhibition?

Effects and mechanisms of anion and cation on the gelation of nanosilica sol by all-atom molecular dynamics simulation: promotion or inhibition?

Numerical Simulation of Nanosilica Sol Grouting for Deep Tunnels Based on the Multifield Coupling Mechanism

Fissure Grouting Mechanism Accounting for the Time-Dependent Viscosity of Silica Sol

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