Improvement of Collapsible Soil Characteristics Using Environmentally Friendly Materials

Sawwaf, Mostafa A. El; Shahien, M.; Nasr, Aml S.; Habib, Mahmoud S.

doi:10.1007/s40098-023-00738-z

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…These results are consistent with those reported in [56,61], which indicated that sodium nanoalginate as a biodegradable material holds the ability to increase the CBR. Moreover, Sawwaf et al [61] indicated that increment in the CBR of soil samples treated with sodium nanoalginate is directly related to the dose used; also, they pointed out that sodium nanoalginate can be used as a sustainable stabilizer to replace the traditional agents.…”

Section: Discussionsupporting

confidence: 92%

Forest Road Subgrade Improvement by Lime and Sodium Nanoalginate Used as Stabilizers for Clay Soils

Mousavi

Abdi

Borz

2023

Forests

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Fine-grained soils cause problems for forest road construction and often require improvements of their mechanical properties. One of the methods of improving mechanical properties of clay soils is soil stabilization. In this study, the effect of a conventional (lime) and a non-conventional (sodium nanoalginate) stabilizer on improving the characteristics of a high plasticity forest soil was compared. Atterberg limits including liquid limit, plastic limit and plasticity index, standard Proctor, UCS (Unconfined Compression Strength) and CBR (California Bearing Ratio) tests were performed on control (untreated) and soil samples treated with different doses (3%, 5% and 7%) of lime and sodium nanoalginate, according to the standard procedures. Moreover, to evaluate the effect of curing time, additional tests were performed on the soil samples treated with 3% lime and 3% sodium nanoalginate at 7, 14 and 28 days after the treatment. The results indicated that adding sodium nanoalginate and lime to the forest soil improves the Atterberg limits. Additionally, adding sodium nanoalginate to the forest soil increases the maximum dry density (γdmax) and decreases the optimum moisture content (OMC), whereas adding lime to the forest soil reduces the maximum dry density and increases the optimum moisture content. Adding sodium nanoalginate and lime in different doses (3%, 5% and 7%) increased UCS and CBR as the main indices of soil strength. The increment range of UCS for the soil stabilized with sodium nanoalginate and lime was 42.59%–160.14% and 31.34%–56.65%, respectively, and the range of CBR improvement for soil stabilized with sodium nanoalginate and lime was 28.72%–122.97% and 13.83%–45.59%, respectively. Increasing the curing time improved the mechanical properties of the forest soil in the samples treated with both stabilizers, but sodium nanoalginate performed better in soil stabilization.

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Section: Discussionsupporting

confidence: 92%

Forest Road Subgrade Improvement by Lime and Sodium Nanoalginate Used as Stabilizers for Clay Soils

Mousavi

Abdi

Borz

2023

Forests

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“…Jacob et al [18] studied improving the quality of clayey using sodium alginate (SA) added in various amounts, such as 0.25%, 0.50%, 0.75%, 1.00%, and 1.25%. The results showed the same with El Sawwaf et al [42]. Gelatin and sodium alginate altered the soil's microstructure, corresponding to XRD and SEM tests.…”

Section: Introductionsupporting

confidence: 85%

Utilizing Sodium Alginate Biopolymer for Enhancing Montmorillonite- Enriched Clayey Subgrade

Abdi,

Deb

2024

Preprint

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Soil stabilization is the optimal approach that can improve various soil properties, including permeability, compressibility, strength, and durability. It is widely known that chemical stabilization can improve the mechanical characteristics of problematic soils. This work examined sodium alginate (SA) as a sustainable bentonite clay stabiliser to improve a high-plasticity clay. We soaked sodium alginate at different concentrations (0%, 0.5%, 1%, 1.5%, 2%, and 3%) to stabilise the bentonite clay of the compacted soil samples, utilising techniques such as standard proctor and unconfined compressive strength (UCS), scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Adding sodium alginate in different amounts (0.5%, 1%, 1.5%, and 2%) lowered the optimum moisture content (OMC) and raised the maximum dry density (MDD). Following 0, 14, and 28 days of curing, the UCS of stabilized samples were evaluated. It was found that adding 2% sodium alginate to bentonite clay raised both the maximum dry density and the optimum moisture content. The soil stabilized using the soaking technique displayed a higher 14-day UCS at the ideal sodium alginate content of 2% compared to the untreated soil. The microstructural investigation showed that the increase in strength was due to sodium aluminosilicate hydrate, a new cementitious material that filled in the pores and made the bonds between particles stronger. This research's conclusions will support bentonite clay's stability through the use of environmentally acceptable sodium alginate in subgrade applications.

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Using Biopolymers to Stabilize Collapsible Soil by Using Wet Mix Method

Habib,

El Sawwaf,

Shahien

et al. 2024

Indian Geotech J

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Improvement of Collapsible Soil Characteristics Using Environmentally Friendly Materials

Cited by 6 publications

References 27 publications

Forest Road Subgrade Improvement by Lime and Sodium Nanoalginate Used as Stabilizers for Clay Soils

Forest Road Subgrade Improvement by Lime and Sodium Nanoalginate Used as Stabilizers for Clay Soils

Utilizing Sodium Alginate Biopolymer for Enhancing Montmorillonite- Enriched Clayey Subgrade

Using Biopolymers to Stabilize Collapsible Soil by Using Wet Mix Method

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