Effects of sulphuric acid pollutant on the shear behaviour and strength of sandy soil and sand mixed with bentonite clay

Hassanlourad, Mahmoud; Khatami, M. H.; Ahmadi, Mohammad Mehdi

doi:10.1080/19386362.2016.1193662

Cited by 7 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the soil is eroded by acidic or alkaline pollutants (e.g., acid rain, industrial wastewaters, etc. ), its physicochemical and mechanical properties change accordingly, in terms of Atterberg limits [26][27][28], compressibility [29,30], and mechanical strength [26,27,[31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Usage of Combined Biopolymer and Plants in Reinforcing the Clayey Soil Exposed to Acidic and Alkaline Contaminations

Chen

Liu

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

In the last decade, biopolymers have been extensively studied, showing a great potential in soil reinforcement and the promotion of vegetation growth with limited environmental impact. In this paper, a soil reinforcing method with combined biopolymer (xanthan gum, XG) and plants (oat) was proposed to strengthen the clayey soil with different pore fluid pH values. A series of laboratory tests were conducted, mainly including the plant cultivation tests and the direct shear tests. It was found that oats grew better in the neutral, weakly acidic, and weakly alkaline soil environments. Both 0.25% XG and 0.50% XG that mostly promoted plant growth, also led to higher soil shear strength. An excessive XG content (e.g., 0.75% and 1.00%) may lead to the formation of a hard XG–soil matrix, preventing oat growth and therefore resulting in a lower shear strength. The XG–oat combination was found to be more effective in treating the soils with acidic pH values. Furthermore, the XG–oat combination is able to reduce the types and contents of heavy metal elements in the soil. Therefore, we suggest using biopolymers in combination with plants to improve the stability and geotechnical performances of the shallow soil slopes that are exposed to acidic and alkaline contamination.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Usage of Combined Biopolymer and Plants in Reinforcing the Clayey Soil Exposed to Acidic and Alkaline Contaminations

Chen

Liu

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Rahman and Nahar 58 also found that the direct shear strength increased with an increase in pH using the ammonia solution for granular soils. Hassanlourad et al 59 studied the effect of sulfuric acid with a different concentration on the shear strength of the sand–bentonite mixture. They found that although the shear strength of sandy soil decreased in acidic pH, the addition of sulfuric acid led to the higher strength of the sand–bentonite mixture at a pH of 3.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength of Acrylic Polymer-Stabilized Kaolinite Clay Modified with Different Additives

Ghasemzadeh

Mehrpajouh

2022

ACS Omega

View full text Add to dashboard Cite

Although numerous studies have shown the successful use of acrylic-based polymers as one of the chemical substances to improve soil mechanical behavior, their basic ingredients in commercial products are not revealed due to the manufacturers’ confidential policy. Among them, additives including pH control agents, thickeners, antifoams, and wetting agents are widely well-known owing to their enhancement effects on different properties of polymers. However, the effect of additives on the soil–polymer mixture is not completely investigated. Therefore, in this study, some of the frequently used additives in acrylic polymers were selected to investigate the effects of each one on the compressive strength of clayey soil. These additives include xanthan gum, Tylose, and carboxymethyl cellulose (CMC) as thickeners, sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB), and Kenon 10 as wetting agents, an ether-based antifoaming agent, and ammonia solution as a pH control agent. A combination of each additive (between 0 and 5% by weight) and polymethyl methacrylate- co -butyl acrylate (with 5% by weight) was added to kaolinite soil to measure the variation of unconfined compressive strength (UCS) and the stress–strain behavior of the soil–polymer–additive mixture. The results indicated that thickeners significantly affected the unconfined compressive strength up to 248% and increased the ductility of the stabilized samples. Acidic pH of the emulsion led to higher unconfined compressive strength of the stabilized soil up to 2.33 times that with alkaline. It is also demonstrated that the use of a higher amount of anionic wetting agent resulted in higher failure strain and lower unconfined compressive strength.

show abstract

“…The study of acid concentration on the mechanical properties of soil is also carried out. Acid has a great influence on the mechanical properties of soil (Hassanlourad et al, 2017;Chavali and Ponnapureddy, 2018;Koupai et al, 2020). used the laboratory permeability test of undisturbed loess to study the permeability characteristics under the action of three kinds of acid erosion, found the influence of acid concentration on the permeability coefficient, and analyzes its mechanism from the perspective of microstructure changes.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Constitutive Model for Loess Samples under Simulated Acid Rain Conditions

Liu

et al. 2021

Preprint

View full text Add to dashboard Cite

In this paper, the sulfuric acid solution is diluted to pH 5.0, 4.0 and 3.0 to simulate the acid rain condition, and the triaxial compressional tests and scanning electron microscope are carried out to study the mechanical properties and evolution of the microstructure of the saturated loess samples. The results demonstrate that acid rain increases the porosity of loess samples, and the pore distribution is not uniform, so that the mechanical properties of loess samples change. With the decrease of pH value, the peak value of the deviatoric stress and the volumetric contraction of loess samples decreases, which causes the strength of soil to decrease. Furthermore, the framework of the chemical-mechanical model for loess under the action of acid rain is established, in which the loess is considered as porous medium material, and the variable of acid rain at different pH values through the degree of chemical reaction is taken into account in the double-hardening model, and the model is also verified by the triaxial test results finally.

show abstract

Effects of sulphuric acid pollutant on the shear behaviour and strength of sandy soil and sand mixed with bentonite clay

Cited by 7 publications

References 21 publications

Experimental Study of the Usage of Combined Biopolymer and Plants in Reinforcing the Clayey Soil Exposed to Acidic and Alkaline Contaminations

Experimental Study of the Usage of Combined Biopolymer and Plants in Reinforcing the Clayey Soil Exposed to Acidic and Alkaline Contaminations

Compressive Strength of Acrylic Polymer-Stabilized Kaolinite Clay Modified with Different Additives

Mechanical Behavior and Constitutive Model for Loess Samples under Simulated Acid Rain Conditions

Contact Info

Product

Resources

About