Integration of SEM/WDX elemental mapping and micromorphology to determine mineralogical traits of peat soils (case study: Northern Iran)

Kurdi, Milad; Eslamkish, Taymor

doi:10.1007/s11631-017-0148-4

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…In order to further explore the anti-compression modification effect of fly ash on coastal cement soil, it was necessary to conduct a microscopic analysis, apply the obtained microscopic particle shape and skeleton structure to macroscopic mechanics, and combine macroscopic and microscopic analyses to obtain persuasive research results [32,36]. Many researchers have studied soil mass and its microstructure and tried to find the quantitative relationship between soil mass and microstructure.…”

Section: Micro Analysismentioning

confidence: 99%

“…Wang et al investigated the micromechanism of nano-magnesia for improving cemented seashore soft soil and silty clay by using of the SEM and EDS (Electronic Differential System) methods [5,11,12]. Kurdi et al integrated SEM/WDX (Wavelength dispersive X-ray spectroscopy) elemental mapping and micromorphology to determine mineralogical traits of peat soils [32].…”

Section: Introductionmentioning

confidence: 99%

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Compression Characteristics and Microscopic Mechanism of Coastal Soil Modified with Cement and Fly Ash

Zhu

Wang

et al. 2019

Materials

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It is of great significance to study the consolidation characteristics of modified coastal cement-soil. A one-dimensional consolidation test and microscopic test were carried out. In the tests, the cement content was 20%, fly ash content was 0%, 5%, 10%, 20%, and 30%, and the water content was 80%. The consolidation test results showed that: (1) Compared with coastal cement soil, the deformation of coastal cement soil modified with a 20% fly ash content was reduced from 4.31 to 2.70 mm, and the vertical compression deformation was reduced by 1.61 mm. (2) During consolidation and compression, the e–p curve (pore ratio-pressure curve) of fly ash-modified coastal cement soil was slower than that of coastal cement soil and the rate of change of pore ratio. (3) The compression coefficient of fly ash-modified coastal cement soil was reduced from 0.780 to 0.598 MPa-1 compared with that of coastal cement soil. The microscopic test results indicate that after adding the proper amount of fly ash, a skeleton was formed between the microscopic particles of the sample, which improved its resistance to compression and deformation. The results of this study indicate that it is feasible to modify coastal cement soil with an appropriate amount of fly ash to improve its compression resistance.

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Section: Micro Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compression Characteristics and Microscopic Mechanism of Coastal Soil Modified with Cement and Fly Ash

Zhu

Wang

et al. 2019

Materials

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Fe(II)-induced transformation of iron minerals in soil ferromanganese nodules

et al. 2021

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Stabilization of Cd²⁺/Cr³⁺ During Aqueous Fe(II)‐Induced Recrystallization of Al‐Substituted Goethite

Liu

Chen²,

Li³

et al. 2019

Soil Science Soc of Amer J

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Recrystallization of Al‐goethites affected mobility of heavy metals in soils. Co‐existing Cd2+/Cr3+ decreased the Fe atom exchange rates between Fe2+aq and Al‐goethites. Fe2+aq‐induced recrystallization of Al‐goethites stabilized Cd2+ and Cr3+. More Cr3+ are stabilized due to its similar ionic radius with Fe3+ and Al3+. Cd2+ ions more active than Cr3+ considering iron mineral activity in soils. The aqueous Fe2+ (Fe2+aq)–induced recrystallization of iron minerals is an important geochemical process with critical effects on the environmental behavior of metal pollutants in soils. However, the effects of different heavy metals with distinctive physicochemical properties on the Fe2+aq–induced recrystallization of iron minerals and the different stabilization behaviors of these heavy metals remain unclear. This study examined the effects of Cd2+ and Cr3+ on the Fe2+aq–induced recrystallization of Al‐substituted goethites and the simultaneous stabilization of Cd2+/Cr3+ ions by the recrystallized Al‐substituted goethites. Results from stable Fe isotopic tracer experiments and Mössbauer characterization show that Fe atoms were exchanged between Fe2+aq and structural Fe(III) in Al‐substituted goethites with coexisting Cd2+/Cr3+, although both Cd2+ and Cr3+ decreased the exchange rates. During the Fe atom exchange, Al‐substituted goethites were recrystallized and a portion of Cd2+/Cr3+ ions were stabilized by the resulting goethite products. Compared with Cd2+, more Cr3+ ions were immobilized by the recrystallized Al‐substituted goethites due to the lower hydrolysis constant of Cr3+ than Cd2+, as well as the closer ionic radius of Cr3+ with Fe3+ and Al3+. Al‐goethites with higher Al contents further decreased the Fe atom exchange rates while increasing the amounts of immobilized metal ions when in the presence of Cd2+ or Cr3+. The findings of the present study suggest that the physicochemical properties of metal ions play critical roles in affecting their environmental behavior and fates during Fe2+aq–induced recrystallization of iron minerals in soils.

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Integration of SEM/WDX elemental mapping and micromorphology to determine mineralogical traits of peat soils (case study: Northern Iran)

Cited by 3 publications

References 8 publications

Compression Characteristics and Microscopic Mechanism of Coastal Soil Modified with Cement and Fly Ash

Compression Characteristics and Microscopic Mechanism of Coastal Soil Modified with Cement and Fly Ash

Fe(II)-induced transformation of iron minerals in soil ferromanganese nodules

Stabilization of Cd²⁺/Cr³⁺ During Aqueous Fe(II)‐Induced Recrystallization of Al‐Substituted Goethite

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Integration of SEM/WDX elemental mapping and micromorphology to determine mineralogical traits of peat soils (case study: Northern Iran)

Cited by 3 publications

References 8 publications

Compression Characteristics and Microscopic Mechanism of Coastal Soil Modified with Cement and Fly Ash

Compression Characteristics and Microscopic Mechanism of Coastal Soil Modified with Cement and Fly Ash

Fe(II)-induced transformation of iron minerals in soil ferromanganese nodules

Stabilization of Cd2+/Cr3+ During Aqueous Fe(II)‐Induced Recrystallization of Al‐Substituted Goethite

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Product

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Stabilization of Cd²⁺/Cr³⁺ During Aqueous Fe(II)‐Induced Recrystallization of Al‐Substituted Goethite