Comparative Study of Soil Grouting with Cement Slurry and Cement‐Sodium Silicate Slurry

Zhu, Mingting; Zhang, Qingsong; Zhang, Xiao; Hui, Bing

doi:10.1155/2018/1893195

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…It has been applied across all ranges of weak soils such as clay soil, black cotton soils, and organic soils among others. Cement has been utilized mostly as a binder and it has been proven to improve the engineering properties of soils (Prusinski & Bhattacharja, 1998) (Binh & Quynh, 2021;Zhu, Zhang, Zhang, & Hui, 2018). With the cost of cement being quite high and other stabilizing materials being discovered, cement has been used in presence of other materials to lower the amount of cement required and help improve on other geotechnical properties that cement alone cannot effectively improve.…”

Section: Introductionmentioning

confidence: 99%

Effect of sodium silicate and cement on the improvement of engineering properties of organic soil

Kiuna,

Kaya

2023

RDLC

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The study is aimed at evaluating the effect of adding sodium silicate and cement to organic soil. Geotechnical properties of organic soil are determined before and after the addition of the stabilizing materials, which in this case are cement and sodium silicate. The results obtained after treatment were analyzed and evaluated to determine whether the strength values reached are adequate for strong subgrades for pavement, and airports construction. Organic soil samples used in this study were obtained from Kayseri Free Area in Turkey. Index properties and geotechnical properties of organic soil, which was identified as sample P, were determined and this formed the reference upon which strength improvements of each mix design sample were obtained. Optimum moisture content and maximum dry density of the soil and the various mixes were obtained using standard proctor test. Unconfined compressive tests (UCS), California bearing ratio (CBR), and Falling head permeability tests were used to determine geotechnical properties. UCS tests were conducted on air cured samples for 1, 7, and 28 days. Soaked and unsoaked CBR samples were tested after 1, 7 and 28 days. Hydraulic conductivity was determined using the falling head permeability test. From the experiments, sodium silicate and cement were seen to improve the strength of organic soil and provide acceptable subgrade strength and CBR values. CBR and UCS tests indicated that longer curing periods improved strength even more. Higher values were obtained for 7 days cured samples than for 1-day samples with the highest values being obtained for 28 days cured samples. Design mixes with higher cement and sodium silicate compositions gave the highest values of strength. In conclusion, sodium silicate and cement give positive results when it comes to stabilizing organic soil.

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Section: Introductionmentioning

confidence: 99%

Effect of sodium silicate and cement on the improvement of engineering properties of organic soil

Kiuna,

Kaya

2023

RDLC

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“…The interior of the rock was developed generally with a large number of different sizes and forms of fractures, and it was of great importance to select an appropriate grout material to control the performance of different fractured rocks [4]. For the rock with deep fractures and micropores, chemical grout with low viscosity and adjustable gel time such as paste grout, silica solutions, hot asphalt grout, and polyurethane grout [5][6][7] was needed to increase the fluidity and ensure the compactness after grouting [8,9]. The fluidity of fluids was not only related to the type of material but also varied with the pressure and temperature of the fluids [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Seepage of Chemical Grout Flow in Rock Fracture under Temperature Field

Zhang

Lin

et al. 2022

Geofluids

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Grouting technology is widely used to improve the mechanical properties and reduce the permeability of the rock in underground engineering. Fluidity is important to promote the grout to be injected into longer fractures, so chemical grouts with low viscosity and adjustable gel time are usually chosen to increase this property. However, the high temperature in some deep engineering leads to a faster hydration rate of the chemical grout than that in the room temperature environment, resulting in the decrease of fluidity. The heat exchange between the grout and the environment is usually ignored in the existing researches, so the aim of the numerical study is therefore to analyse the seepage process of chemical grout in the temperature field, where heat exchange between the grout and environment is considered. A sandstone model with a fracture is established in COMSOL, which is validated using laboratory experiments to confirm the accuracy of the results. The grouting time rises exponentially with the increasing of the flow distance in a single fracture, and a higher environmental temperature leads to a larger grouting time because the gap in the viscosity of the grout at different temperatures enlarges with the increasing hydration time. The effect of the temperature field on the grouting time becomes more significant when the temperature is higher and the hydration time is longer because the viscosity of the grout rises more slowly. The grouting time reduces dramatically when injection pressure is raised because an increasing pressure results in a larger aperture and less hydration time, which is one of the best ways to improve the efficiency of the grouting. The findings of this study can help for better understanding of the seepage process of chemical grout in fractures under high temperature and provide guidance for the selection of chemical grout in grouting engineering.

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“…According to the viscosity characteristics of slurry, Zhu et al [ 20 ] found that the viscosity of cement slurry changed little in the process of grouting, while the viscosity of cement-sodium silicate slurry increased rapidly with the increase of time. Yang et al [ 21 ] and Du et al [ 22 ] have done a lot of research on the variation law of the viscosity of all kinds of slurry, and proved that the viscosity of the slurry has time-varying characteristics, but the specific law of the time-varying viscosity of the slurry has not been deeply studied.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Viscosity Characteristics of Grouting Slurry in a High Ground Temperature Environment

2020

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The grouting method is a technical means to prevent and control the thermal damage of the tunnel with high ground temperature in the underground hot water area, and the viscosity characteristic of the slurry is the key factor of grouting treatment. When grouting in high ground temperature geological conditions, the slurry inevitably has both time-varying and temperature-varying characteristics of viscosity in the process of filling high-temperature fissures and plugging geothermal water. At present, the research on the viscosity characteristics of slurry at high temperature is rarely reported in the literature. In this paper, laboratory tests were carried out to measure the time-varying viscosity of ordinary cement slurry; cement-sodium silicate slurry, widely used in engineering; and high ground temperature grouting slurry (HGTGS), independently developed by our research group, at different preheating temperatures (20, 40, 60, 80 °C). The viscosity function curves of the three kinds of slurry were obtained by function fitting method, and the viscosity variation law of slurry was analyzed. The study found that the time-varying process of viscosity of the cement-sodium silicate slurry and the HGTGS in specific temperature conditions can be divided into two stages: The slow rising period of viscosity and the rapid rising period of viscosity. Whereas, the time-varying process of viscosity of ordinary cement slurry in specific temperature conditions includes only one stage of the slow rising period of viscosity. The viscosity of ordinary cement slurry and cement-sodium silicate slurry increases with the increase of temperature, while the viscosity of the HGTGS decreases with the increase of temperature. There are corresponding viscosity time-varying equations for the three kinds of slurry in different temperature conditions. The viscosity time-varying equation of the ordinary cement slurry accords with the linear function form, and the viscosity time-varying equation of the cement-sodium silicate slurry accords with the power-law function form. The viscosity time-varying equation of the HGTGS conforms to the exponential function form. On this basis, the unified description equation of the viscosity characteristics of grouting slurry in high ground temperature and the applicability of different types of grouting materials are obtained. This study has a certain reference value and guidance for theoretical analysis, numerical simulation and engineering application of grouting in high ground temperature environment.

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Comparative Study of Soil Grouting with Cement Slurry and Cement‐Sodium Silicate Slurry

Cited by 11 publications

References 11 publications

Effect of sodium silicate and cement on the improvement of engineering properties of organic soil

Effect of sodium silicate and cement on the improvement of engineering properties of organic soil

Numerical Study on Seepage of Chemical Grout Flow in Rock Fracture under Temperature Field

Experimental Research on Viscosity Characteristics of Grouting Slurry in a High Ground Temperature Environment

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