Properties of soil–bentonite–cement bypass mixture for cutoff walls

Ata, Alaa; Salem, Tarek N.; Elkhawas, Nadia M.

doi:10.1016/j.conbuildmat.2015.05.064

Cited by 41 publications

(28 citation statements)

References 4 publications

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“…The limit of plasticity of montmorillonite increases with the addition of cement up to 8% and then begins to decrease. It is concluded that adding the treatment to a control soil increases the consistency limit [16,17].…”

Section: Influence Of Bentonite-cement Treatment On the Atterberg Limmentioning

confidence: 97%

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Treatment of a collapsible soil using a bentonite–cement mixture

Bellil

Abbèche

Bahloul

2018

Studia Geotechnica Et Mechanica

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The study of collapsible soils that are generally encountered in arid and semi-arid regions remains a major issue for geotechnical engineers. This experimental study, carried out on soils reconstituted in the laboratory, aims firstly to present a method of reducing the collapse potential to an acceptable level by treating them with different levels of bentonite–cement mixture while maintaining the water content and degree of compactness, thus reducing eventual risks for the structures implanted on these soils. Furthermore, a microscopic study using scanning electron microscopy was carried out to explore the microstructure of the soil in order to have an idea of the phenomena before and after treatment. The results show that treatment with a bentonite–cement mixture improves the geotechnical and mechanical characteristics, modifies the chemical composition of the soil, reduces the collapse potential and the consistency limits. The microstructural study and the X-ray energy dispersive spectroscopy analysis clearly illustrate an association of elementary particles in the soil aggregates, whereby the arrangement of these aggregates leads to the formation of a dense and stable material.

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Section: Influence Of Bentonite-cement Treatment On the Atterberg Limmentioning

confidence: 97%

“…The absorption of water between the parallel sheets will then limit and prevent contact between the cement grains and water, thus inhibiting the hydration of cement [17].…”

Section: Microanalysis Of Treated Soilmentioning

confidence: 99%

Treatment of a collapsible soil using a bentonite–cement mixture

Bellil

Abbèche

Bahloul

2018

Studia Geotechnica Et Mechanica

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“…such as the nuclear waste storage [28][29][30][31][32]. soil stabilisation or impermeable slurry wall construction [21].…”

Section: Discussionmentioning

confidence: 99%

“…Few studies on its non-pre-calcined use have been found in the literature [10][11][12][13][14][15][16][17][18][19][20]. Its use in foundations and for stabilizing the soil [21][22][23] however is much more common, although for that approach has consistently posed rheological problems. For this last reason, many building codes limit the presence of clay materials in aggregates.…”

Section: Introductionmentioning

confidence: 99%

“…A review of the literature on the long-term performance of bentonite showed that it has exhibited excellent durability in underground works, where it has been used profusely as permanent formwork in concrete foundations often built long ago [21][22][23]. And whilst bentonite plays a non-calculated load-bearing role in such cases, none of the studies published report any long-term incompatibility between the two materials.…”

Section: Introductionmentioning

confidence: 99%

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Decrease of Carbonation, Sulfate and Chloride Ingress due to the Substitution of Cement by 10% of Non Calcined Bentonite

Andrade¹,

Martínez-Serrano²,

Sanjuán³

et al. 2021

Preprint

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Clinker production is being reduced worldwide in response to the need to drastically lower greenhouse gas emissions. The trend began in the nineteen seventies with the advent of mineral additions to replace clinker. Blast furnace slag and fly ash, industrial by-products that were being stockpiled in waste heaps at the time, have not commonly been included in cements. Supply of these additions is no longer guaranteed, however, due to restrained activity in the source industries for the same reasons as in clinker production. The search is consequently on for other additions that may lower pollutant gas emissions without altering cement performance. In this research bentonite, a very common clay, was used as such an addition directly, with no need for pre-calcination, an still novel approach that has gone little explored to date for reinforced concrete with structural applications. The results of the mechanical strength and chemical resistance (to sulfates, carbonation and chlorides) tests conducted are promising. The carbonation findings proved to be of particular interest, for that is the area where cement with mineral additions tend to be least effective. In the bentonite-bearing material analysed here, however, carbonation resistance was found to be low as or lower than observed in plain Portland cement.

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