Effects of Protein-Based Biopolymer on Geotechnical Properties of Salt-Affected Sandy Soil

Nouri, Houman; Ghadir, Pooria; Fatehi, Hadi; Shariatmadari, Nader; Saberian, Mohammad

doi:10.1007/s10706-022-02245-z

Cited by 16 publications

(5 citation statements)

References 50 publications

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“…On the other hand, in a steam-curing environment, the steam kept the shrinkage process from drying up, preserving the samples' strength. The results of this study contributed to the potential of using seawater as well as sea sand in the manufacture of geopolymer concretes [2,[17][18][19].…”

Section: Introductionmentioning

confidence: 72%

“…Recently, seawater is being used more and more in soil stabilization techniques including deep mixing and jet grouting to reduce fresh water consumption. However, some researchers have looked into how soil-cement behavior is impacted by water salinity [2]. In this line, the microstructural and mechanical characteristics of Portland cement (OPC) stabilized saline soils were investigated in previous research [3].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Samadi¹,

Ghodrati²,

Ghadir³

2023

Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)

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Freshwater supply for stabilizing sandy soils is one of the significant challenges in coastal regions. On the other hand, Ordindary Portland cement (OPC) has several limitations in the exposure to saline environments. Geopolymers, as environmentally friendly soil stabilizers, have been widely used in soil stabilization research. In this paper, the effects of natural seawater (SW) on the mechanical and microstructural properties of Portland cement/geopolymer stabilized sandy soils were studied. The soil samples were prepared with freshwater as reference samples. The impacts of binder type, slag replacement, curing duration, and curing conditions on the mechanical strength of stabilized soil samples were investigated. SEM images were used for microstructural analysis of the geopolymer stabilized soil samples. The results indicated that the use of seawater in stabilizing soil resulted in higher strength development in short-term (28 days) compared to the distilled water-based samples. However, seawater adversely affected the soil's long-term (90 days) strength. In addition, the strength of slag-based samples was generally higher than the strength of OPC and VA-based samples. Therefore, alkali-activated slag can be a potential replacement for OPC paste in stabilizing sandy soils. The SEM images revealed that using seawater led to the alteration of cementitious gels in comparison to distilled water.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Samadi¹,

Ghodrati²,

Ghadir³

2023

Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)

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“…Wind erosion and dust control of biopolymer-treated soil samples were evaluated after being subjected to wet–dry conditions. Biopolymers are able to increase the resistance of soil against wind erosion [ 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Particle Size Distribution and Moisture Variation on Mechanical Strength of Biopolymer-Treated Soil

Fatehi

Ong

et al. 2023

Polymers

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Biopolymers have recently shown great potential to replace traditional binding materials in geotechnical engineering; however, more research is required to reach a deeper understanding of biopolymer-treated soil behavior. The objective of this study was to investigate the most important parameters that affect the behavior of biopolymer-treated soil, including biopolymer content, dehydration time, soil type effect, and durability. Sodium alginate and agar biopolymers were used due to their stability under severe conditions and the reasonable costs to study these parameters. A broad range of soil particle sizes was used to optimize the kaolinite-sand combination. As one of the main concerns in the behavior of biotreated soils, durability was investigated under five cycles of wetting and drying. In addition, a comprehensive microstructural study was performed by FTIR analysis and SEM images, as well as chemical interaction analysis. The results indicated that the optimized biopolymer content was in the range of 0.5–1% (to soil weight) and the dehydration time was 14 days. A soil combination of 25% kaolinite and 75% sand provided the highest compressive strength. Under wetting and drying conditions, biopolymers significantly increased soil resistance against strength reduction and soil mass loss. The results showed that the biopolymers, agar and sodium alginate provided significant soil improvement. The optimum values of different parameters to reach the highest performance were also obtained. In addition, the biopolymers were highly effective in enhancing the durability of the treated soil under wetting and drying conditions. Based on the results, optimal values of the agar and sodium alginate-treated soil for sand and kaolinite are confirmed.

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“…Geopolymer is a kind of inorganic polymer and a product of aluminosilicates reaction with alkali activators [9]. It has the potential to be utilized in a multitude of applications such as structural elements, soil stabilization, and immobilization of heavy metals [10][11][12][13][14]. The geopolymerization process includes three steps: (1) the alkali activator triggers the deconstruction of aluminosilicate source, (2) the alumina/silica-hydroxy polymerization generates geopolymeric gel, and (3) the fresh structure is stabilized [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Blast Furnace Slag on Pore Structure and Transport Characteristics in Low-Calcium Fly-Ash-Based Geopolymer Concrete

Azimi,

Toufigh

2023

Sustainability

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Alkali-activated fly ash slag (AAFS) has emerged as a novel and environmentally sustainable construction material, garnering substantial attention due to its commendable mechanical attributes and minimal ecological footprint. This investigation delves into the influence of slag incorporation on the strength, pore structure, and transport characteristics of AAFS, encompassing various levels of fly ash replacement with slag. To assess the mechanical properties of AAFS concrete, unconfined compression and ultrasonic pulse velocity tests were conducted. Meanwhile, microstructural and mineralogical alterations were scrutinized through porosity, N2-adsorption/desorption, and SEM/EDX assessments. In addition, transport properties were gauged using electrical surface resistivity, water permeability, and water vapor permeability tests. According to the results, a remarkable refinement in the pore volume was found by increasing the slag content. The volume of the gel pores and surface area increased significantly associated with the increase in tortuosity. Accordingly, Ca inclusion in the cross-linked sodium aluminosilicate hydrate gel remarkably reduced the transport properties.

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Effects of Protein-Based Biopolymer on Geotechnical Properties of Salt-Affected Sandy Soil

Cited by 16 publications

References 50 publications

Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

The Effects of Particle Size Distribution and Moisture Variation on Mechanical Strength of Biopolymer-Treated Soil

Influence of Blast Furnace Slag on Pore Structure and Transport Characteristics in Low-Calcium Fly-Ash-Based Geopolymer Concrete

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