Effect of Cationic Exchange Capacity of Soil on Strength of Stabilized Soil

Wei, Daoxin; Zhu, Bo; Wang, Tong; Tian, Miaomiao; Huang, Xin

doi:10.1016/j.sbspro.2014.05.070

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…During the cation exchange process, monoatomic elements such as K + and Na+ ions in clay particles are replaced by divalent elements in the additives. The process occurs when alkaline oxides like CaO and MaO react with water and separate into Ca +2 and Mg +2 ions, which subsequently replace the monovalent ion in the clay particle via ion exchange [17,19,20]. The flocculation-agglomeration is depicted by the rearranging of clay particles from a parallel flat structure to a more random shape [17,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil

Moges,

Assefa,

M. Assefa

2024

Advances in Civil Engineering

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This study explores the impact of wetting and drying cycles on teff straw ash-stabilized expansive soil, with a focus on enhancing its mechanical properties for road subgrade applications. Expansive soil, characterized by continuous swell and shrink behavior, undergoes cyclic testing to establish equilibrium and critical density. The mitigating effects of teff straw ash on soil damage and its influence on expansive soil’s mechanical attributes are investigated. Laboratory results classify natural expansive soil as A-7-5 and CH according to AASHTO and USCS standards, respectively. Using a one-dimensional odometer apparatus, six wetting–drying cycles are conducted on teff straw ash-stabilized expansive soil to observe its behavior at equilibrium. Scanning electron microscopy reveals a disordered bond between soil particles and teff straw ash, intensifying with increased wetting–drying cycles. X-ray diffraction analysis is performed on samples subjected to different curing times, indicating heightened cation exchange and pozzolanic reactions as curing duration increases, thereby reducing soil expansiveness. A 96-hr socked California Bearing Ratio (CBR) test assesses subgrade strength. The CBR values for natural soil fall below the Ethiopian Road Authority (ERA) standards for low-volume roads. In contrast, expansive soil stabilized with teff straw ash at 10%, 15%, and 20% exhibits substantial increases in CBR values (3.7, 6.7, and 8.9, respectively), meeting the ERA standards. This suggests that teff straw ash stabilization renders expansive soil suitable for low-volume road subgrades, aligning with ERA standards. This comprehensive study provides valuable insights into the potential use of teff straw ash as an effective stabilizer for expansive soils, offering sustainable solutions for road construction in regions characterized by expansive soil challenges.

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Section: Introductionmentioning

confidence: 99%

Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil

Moges,

Assefa,

M. Assefa

2024

Advances in Civil Engineering

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“…Portland cement was also used with other stabilizing materials to improve the soil engineering properties. Lime is used with cement to improve the soil strength and reduce the swelling and settlement (Amu et al, 2008;Joel & Agbede, 2010;Lemaire et al, 2013;Mousavi & Leong Sing, 2015;Riaz et al, 2014;Saeed et al, 2015;Sharma et al, 2018;Umesha et al, 2009;Wei et al, 2014). Nayak & Sarvade (2012) used cement and quarry dust to improve the shear strength and hydraulic features of lithomarge clay.…”

Section: Introduction and Past Studiesmentioning

confidence: 99%

Geotechnical and other characteristics of cement-treated low plasticity clay

Alkiki¹,

Abdulnafaa²,

Aldaood³

2021

S&R

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This research work examines the utilization of cement in order to improve low plasticity clay soil. The soil samples treated with 2, 4 and 6% cement percents and cured for different curing times extended to 90 days. Laboratory investigations include unconfined compression, indirect tensile, gas permeability and microstructural tests, which were conducted on the tested samples. The soil-water retention behavior has been also investigated. The test results showed that the cement addition improved both the compressive and tensile strength properties of soil specimens. These strength properties were also increased with curing times. pH and electrical conductivity values were good indicators for the enhancement in the strengths properties. The results of micro structural tests illustrated that the natural soil specimens contain voids and the open structure. Further, these tests showed the cementation of soil grains and filling the voids among soil grains with cementing compounds. Gas permeability and soil-water retention behavior of soil specimens are strongly related to the variations in the soil structures. Further examination illustrated that in the case of low cement content, the pore size distribution (PSD) and the efficiency of gas permeability are more sensitive to curing times.

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Effect of Cationic Exchange Capacity of Soil on Strength of Stabilized Soil

Cited by 2 publications

References 6 publications

Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil

Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil

Geotechnical and other characteristics of cement-treated low plasticity clay

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