Effect of cation exchange capacity of soil on stabilized soil strength

Yu, Hao; Huang, Xin; Ning, Jianguo; Zhu, Bo; Yin, Chao

doi:10.1016/j.sandf.2014.11.016

Cited by 44 publications

(12 citation statements)

References 7 publications

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“…Similarly, Towhata et al [19] and Villar and Lloret [20] investigated temperature effects on clayey soils and showed that the changes in viscosity of water with temperature have the most important mechanism in the change of soils properties. The strength of clay soil can be affected by its cation exchange capacity, CEC [21]. Goodman et al [22] reported that beyond temperature of 100 °C, the CEC of buckshot clay soil decreased considerably.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effects of elevated temperature on geotechnical behaviour of tropical residual soils

Attah

Etim

2020

SN Appl. Sci.

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The engineering performance of soil after exposure to temperature is increasingly important in geotechnical and geoenvironmental engineering. Most thermal remediation of soil concentrates more on the remediation outcome and eliminates the effects temperature will have on the engineering properties of the soil itself. This paper presents the results of laboratory study conducted on two lateritic soils to investigate effect of elevated temperature difference on their geotechnical properties. The soils were classified as A-7-6 (8) and A-7-5 (4) based on the AASHTO soil classification system. After subjecting the soil samples to elevated temperatures (25, 50, 100, 150 and 200 °C), tests such as Atterberg limit, compaction, California bearing ratio (CBR), unconfined compressive strength (UCS) and scanning electron microscopy were carried on the samples. The results showed a decrease in Atterberg limit and increase in maximum dry density. The peak CBR for both the soils was obtained at 150 °C. The UCS increased with curing time but decreased with increased preheat temperature for both soils. The microanalysis result portrayed changes in morphological structure of fabrics which indicates a breakdown in the microstructural properties of the soil due to temperature variation. Generally, the statistical analysis of variance showed that temperature has significant effect on the geotechnical properties of residual soils.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effects of elevated temperature on geotechnical behaviour of tropical residual soils

Attah

Etim

2020

SN Appl. Sci.

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“…It is worth mentioning that the highest Ca(OH)2 SI was −0.8, while under the sam cement addition conditions, Yu et al [25] detected supersaturated Ca(OH)2 in cemen stabilized soils with low cation exchange capacities (≤ 32 meq/100 g), which had a highe strength than those with undersaturated Ca(OH)2 and high cation exchange capacitie Hence, the authors suggest that the cation exchange process of the soil minerals was pr marily ascribed to the undersaturation of Ca(OH)2 and the slow strength increase in th cement-stabilized soils. In addition, the saturation level of CaOH + was investigated wit respect to the thermodynamic equation CaOH + →Ca 2+ +OH − , with SI values that fluctuate between 0.306 and 0.439 and a development pattern that was identical to that of Ca(OH) This result suggested that the aqueous species of Ca, which should have crystallized t Ca(OH)2, participated in the subsequent reactions in the form of CaOH + .…”

Section: The Correlation Analysis Of the Saturation Levels Between Ca...mentioning

confidence: 91%

“…Though the thermodynamic method has been successfully applied to cementitious materials, it has not been systematically extrapolated to cement-stabilized soils. Some pioneer works have calculated the SI values the minerals ettringite (AFt) [6] and Ca(OH) 2 [25] with respect to different chemically stabilized soils, which has revealed the impacts of these two minerals on the engineering performances of the respective systems. However, the influence of the coexistence of complex aqueous species on SI calculations has not been considered in previous works and the evaluation of the general chemical processes of cement-stabilized soils using a single phase may not be accurate enough since some hydrated phases (such as Ca(OH) 2 ) are the reactants of the simultaneous pozzolanic reactions of soil minerals [26,27].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Mineral Dissolution and Precipitation in Cement-Stabilized Soils: Thermodynamic Modeling and Experimental Analysis

Hua

et al. 2022

Applied Sciences

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Thermodynamic modeling helps to reveal insights into the basic chemical kinetics of dissolution and precipitation in cementitious materials, but relevant applications to cement-stabilized soils have seldom been reported. Based on the thermodynamic database of Cemdata18 and the pore solution composition of cement-stabilized soils, this study formulated a specialized thermodynamic model, using essential thermodynamic constants for soil minerals that were calculated to ensure the model’s accuracy. Two commercial admixtures of alkaline activator and polynaphthalene sulfonate were selected for the different modification mechanisms and plain and modified cement-stabilized soils were prepared. Compressive strength was tested to determine the specimens for pore solution analysis and the influences of the admixture type and dose on dissolution and precipitation were investigated by modeling the ionic activity products and saturation indexes. An X-ray diffraction (XRD) analysis was performed to verify and complement the thermodynamic results. The major research findings were that (1) thermodynamic modeling can be reliably applied to cement-stabilized soils by providing the essential thermodynamic data and an appropriate product model, (2) the pozzolanic reaction is accelerated by increasing the OH− concentration in the pore solution, while the cement hydration is highly dependent on the dissolution of Ca(OH)2 and the relevant complexes and (3) the dissolution equilibrium of Ca(OH)2 is directly affected by the alkaline activator dissolution and is indirectly affected by the polynaphthalene sulfonate adsorption of the reactants.

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“…Those provide an alternative to bases constructed following the deep-cold recycling technology Iwański and Chomicz-Kowalska [1], and also Iwański et al [2]. In the first place, road binders are applied to the subgrade to improve its bearing capacity and alter the bearing capacity class Iwański and Buczyński [3] oraz Yu et al [4] and Ahmed et al [5] or Chai and Miura [6]. The application range of road binders can be extended to include sub-bases, road bases, in the latter those have the form of hydraulically bound aggregate mixes WT-5 [7], and also bases treated with foamed bitumen and bitumen emulsion Iwański et al [2], also Iwański and Chomicz-Kowalska [8].…”

Section: Introductionmentioning

confidence: 99%

The Impact of One-, Two- and Three-component Hydraulic Road Binder on the Properties of the Hydraulically Bound Mixture

Buczyński

Lech

2015

Procedia Engineering

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The paper presents the results of tests on road base used in the construction and maintenance of roads stabilised with hydraulic binders. Seven hydraulic binder mixes were prepared under laboratory conditions by mixing three basic components: Portland cement CEM I 32.5 R, fluidized bed combustion ash (PF) and cement kiln dust (CKD). The proportions of the binder components were established in accordance with the experimental design. The percentage share of the hydraulic road binder in the bound mix was 6%. Two types of natural aggregates were used for the base. The percentage shares of the individual components in the mix were designed using the Proctor method. For pastes, made from binders, basic mechanical properties were determined. To assess the effect of binders on the properties of the base stabilised with hydraulically bound mixtures tests were conducted to measure the following: compressive strength after 7, 14, 28 and 42 days of curing, freeze-thaw resistance. Experimental results demonstrate that it is possible to determine the optimal composition of hydraulic binders for the required strength class of the base course.

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Effect of cation exchange capacity of soil on stabilized soil strength

Cited by 44 publications

References 7 publications

Experimental investigation on the effects of elevated temperature on geotechnical behaviour of tropical residual soils

Experimental investigation on the effects of elevated temperature on geotechnical behaviour of tropical residual soils

An Investigation on Mineral Dissolution and Precipitation in Cement-Stabilized Soils: Thermodynamic Modeling and Experimental Analysis

The Impact of One-, Two- and Three-component Hydraulic Road Binder on the Properties of the Hydraulically Bound Mixture

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