Dispersion characteristics of MgO-treated dispersive clay

Fattah, Mohammed Y.; Ismael, Roaa; Aswad, Mohammad

doi:10.1007/s12517-021-06957-z

Cited by 22 publications

(5 citation statements)

References 20 publications

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“…According to the chemical analysis, POFA has a high silica (SiO2) concentration, as indicated in Table 2. Nano MgO was used in this study as a chemical activator since it is an environmentally friendly and low-carbon soil stabilizer that leads to fewer CO2 emissions [43,44]. It might react with water rapidly because of its strong reactivity and low crystallinity.…”

Section: Soil Sample and Stabilizing Materialsmentioning

confidence: 99%

“…The parameter sensitivity is evaluated according to the cases given in Tables 7 and 8. The results of applying the cases (43)(44)(45)(46)(47) given in Table 7 are visualized in Figure 12, considering stress-strain behavior. The lines in the graph are divided in the order of the cases in which they are illustrated.…”

Section: Time-dependent Stiffness-strength Parametersmentioning

confidence: 99%

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Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Al-Dalain,

Ezreig,

Ismail

2024

Civ Eng J

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Over the years, investigating the behavior of soft soil, stabilized using different techniques, has been recognized as a critical priority for geotechnical engineers. Numerous soil constitutive models have been utilized to simulate stabilized soil behavior, improve strength and ductility, and analyze load-deformation responses. However, further investigation is required to study stabilized soil's time-dependent strength and stiffness, especially at an early curing age. Early strength and stiffness development is crucial in engineering construction for improving building quality and efficiency and minimizing crack risk. Furthermore, estimating UCS from an early age aid in safety evaluation and ground-improvement analysis. Researchers are increasingly recognizing palm oil fuel ash (POFA) as an eco-friendly alternative to traditional soil stabilizers due to its abundant availability. This study proposes an advanced concrete constitutive model to simulate the time-dependent strength and stiffness of POFA-stabilized and cement-stabilized soil due to pozzolanic interactions. The model accurately measures strength and stiffness improvement from an early curing age to 28 days using finite element analysis (FEA) before then comparing the experimental results. Based on the experimental results, the UCS values of palm oil fuel ash-stabilized soil grew to 3.18 MPa and 3.89 MPa after seven and 28 days with an optimum content of 30% (POFA): 10% Magnesium Oxide (MgO). It exhibited a significant increase in early strength with 64.02% compared with cement-stabilized soil. For stiffness results, a slight increment of 9.26% was observed. Employing FEM, the sensitivity of the parameters to stress-strain behavior was investigated. Finally, the validity of the concrete constitutive model to predict the time-dependent strength and stiffness of stabilized soil was proved. Doi: 10.28991/CEJ-SP2024-010-05 Full Text: PDF

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Section: Soil Sample and Stabilizing Materialsmentioning

confidence: 99%

Section: Time-dependent Stiffness-strength Parametersmentioning

confidence: 99%

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Al-Dalain,

Ezreig,

Ismail

2024

Civ Eng J

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“…Pinhole test [15] simulates water flow through soil cracks, in which process is intuitive, and its 5 Geofluids results are generally considered highly reliable [1]. Crumb test [16] is based on the colloidal chemistry point of view [18], which is second in credibility to the pinhole test [19]. Therefore, these two tests were chosen to identify the dispersibility of the improved soil sample and explore the optimal alum mixture quantity.…”

Section: Dispersibility Testmentioning

confidence: 99%

A Study on the Durability of Dispersive Soils Improved by Alum in Western Jilin Province of China

et al. 2021

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Dispersive soil, which has the characteristics of low erosion resistance and high dispersibility in water, is the main reason for the channel slope failure that happened in the planning area of the Western Alkaline Treatment project in Jilin Province. Therefore, the study focused on the improvement of dispersive soil. In this research, pinhole test and crumb test were conducted on the soil under varying percentages of alum (1%, 1.5%, 2%, 2.5%, and 3%). Results indicated that alum can reduce the dispersivity of soil distinctly, and the optimal content of alum was 2.5%. This research also investigated the durability of 2.5%-alum-improved dispersive soil for dispersibility under the condition of freeze-thaw cycle. The soil samples with 2.5% alum content were subjected to pinhole test, crumb test, double hydrometer test, and percentage of exchangeable sodium ion test under the different number of freeze-thaw cycles. The results showed that the 2.5%-alum-improved soil was unaffected by the number of freeze-thaw cycles, which illustrated that alum can be used to improve soil dispersivity in engineering practice.

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“…Introducing water into the system displaces sodium ions, increasing interparticle distance and forming micropores within the clay matrix. The attractive forces between clay particles weaken, making the material vulnerable to erosion [4]. Within the clay structure, micro-spaces become minute channels, which eventually enlarge into siphons due to continuous water erosion.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al employed the pinhole test to calculate the internal erosion of compacted loess against different hydraulic conditions [13]. Other studies focused on improving dispersive soils [4,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dispersivity in Marine Clays of Cartagena de Indias, Colombia

Acuña,

Betancur,

Baldovino

et al. 2023

Geosciences

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This study assessed the dispersivity of soils extracted from the northern region of Cartagena de Indias (Colombia) using the pinhole test, crumb test, and chemical–microstructural analyses. Dispersive soils are susceptible to erosive phenomena upon contact with water, yet they have not been adequately characterized in the city. To evaluate the dispersivity degree of different deformed and undisturbed soil samples, soil characterization tests included particle size analysis, chemical composition, Atterberg limits, specific gravity, and compaction. The results showed that the soils are highly plastic clays (i.e., CH) with a slight to moderate dispersivity level (i.e., ND3) according to the pinhole test and a moderate degree of dispersivity confirmed by the crumb test. The extracted soil sample sodium levels ranged from 0.72% to 1.94%, and the soil had an optimal moisture content of 26% and a maximum apparent dry unit weight of 13.87 kN/m3. According to standards and results, Cartagena de Indias’s studied marine clays are unsuitable for civil construction due to the degree of uncertainty in their behavior.

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Dispersion characteristics of MgO-treated dispersive clay

Cited by 22 publications

References 20 publications

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

Numerical Analysis of Time-Dependent Strength and Stiffness in Palm Oil Fuel Ash-Stabilized Soil: Early and Long-Term Effects

A Study on the Durability of Dispersive Soils Improved by Alum in Western Jilin Province of China

Analysis of Dispersivity in Marine Clays of Cartagena de Indias, Colombia

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