Improvement of swelling chlorite soil using sodium silicate alkali activator

Elmannaey, Ahmed S.; Fouad, Hala E.E.; Youssef, Youssef G.

doi:10.1016/j.asej.2020.10.019

Cited by 9 publications

(3 citation statements)

References 26 publications

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“…This also shows that the post-failure stress of stabilized soil drops much more rapidly with a longer curing period than with a shorter curing period [51]. As shown in Figure 5, there are significant increases in the UCS of all stabilized samples with an increasing curing period, and this has been reported by many researchers [52][53][54][55]. The results show that the strength increased from 257 kPa for untreated soil to 2270 kPa and 2881 kPa for soil with 15% OPC at seven and 28 days, respectively.…”

Section: Resultssupporting

confidence: 67%

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: Resultssupporting

confidence: 67%

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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“…The improvement in early strength was obvious. This enhancement of strength at all ages can be attributed to the destruction of the mineral phases (such as the clay-based minerals in CDWRS) and hydration product generation in the curing process because water glass was widely used in the modification of clay-based materials for destroying structure and reconstructing networks of hydration products [60][61][62]. However, the water in the water glass would increase the content of free water in the system when the content of the water glass further rose, thus weakening the mechanical performance of the foamed concrete [63].…”

Section: Modification Of Cdwrs Recycled Foamed Concretementioning

confidence: 99%

Pore Structure, Hardened Performance and Sandwich Wallboard Application of Construction and Demolition Waste Residue Soil Recycled Foamed Concrete

Yang,

Jin

et al. 2024

Sustainability

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Construction and demolition waste residue soil (CDWRS) recycled foamed concretes were prepared by introducing the original CDWRS into modified binders. Pore structure, hardened performance, and sandwich wallboard application were also investigated. The results indicated that 51 kg/m3 of water glass and 7.5 kg/m3 of gypsum could significantly increase the strength and generate a slight influence on the thermal insulation performance of CDWRS recycled foamed concrete. The largest enhancing rate of 28-day compressive strength at a density of 600 kg/m3 could reach 205.5%. Foamed concrete with 1126 kg/m3 of CDWRS, modified with water glass and gypsum, showed a low thermal conductivity of 0.11 W/(m·K) and a dry density of 626 kg/m3. In total, 988 kg/m3 of CDWRS in foamed concrete led to a compressive strength of 7.76 MPa, a thermal conductivity of 0.14 W/(m·K), and a dry density of 948 kg/m3. Utilization of the foamed concrete in the sandwich structure could fabricate energy-saving wallboards with a minimum heat transfer coefficient of 0.75 W/(m2·K) and a relatively high compressive strength of 16.5 MPa, providing great confidence of CDWRS consumption in the building energy-saving field.

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“…Swelling soil rentan terhadap keretakan (crack). Solusi perbaikan tanah kembang susut (swelling soil) yang dapat dilakukan diantaranya adalah penggantian tanah, mengisolasi tanah dari air, meningkatkan tegangan kontak di bawah pondasi dangkal, menggunakan tiang pancang dengan ujung yang diperbesar (Elmannaey et al, 2021). Solusi lain yaitu stabilisasi tanah, yaitu dengan menginjeksi bahan kimia ke dalam tanah.…”

Section: Pendahuluanunclassified

Pengaruh Biopolimer Pada Stabilitas Lereng Swelling soil

2021

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Many studies have begun to develop the concept of cracked soil. The results of research related to cracked soil are able to answer the irregularities that occur, such as the difference in the results of the stability analysis which is considered safe with the conventional bishop method, while the conditions in the field are landslides. Swelling soil is soil that is susceptible to changes in water content. This type of soil is very prone to cracking. To build infrastructure on the swelling soil type, an improvement must be made, one of which is by mixing the swelling soil with biopolymer. The results of this biopolymer mixing are then modeled in the New Slope Stability Analysis Program (NSSAP) 1.0 which refers to the concept of cracked soil. From the analysis, it was found that the slope safety factor before improvement with biopolymer was 0.305 and the safety factor after improvement with biopolymer was 2.006. From the results of this study, it can be seen that the role of biopolymers in stabilizing swelling soil is quite large, which is around 558%.

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Improvement of swelling chlorite soil using sodium silicate alkali activator

Cited by 9 publications

References 26 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

Pore Structure, Hardened Performance and Sandwich Wallboard Application of Construction and Demolition Waste Residue Soil Recycled Foamed Concrete

Pengaruh Biopolimer Pada Stabilitas Lereng Swelling soil

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