Pore scale characterization of lime-treated sand–bentonite mixtures

Hashemi, Mir Amid; Massart, Thierry; Salager, Simon; Herrier, Gontran; Baudin, François

doi:10.1016/j.clay.2015.04.001

Cited by 33 publications

(9 citation statements)

References 36 publications

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“…A possible explanation for this may be the pH which reached 10.5 directly after the application (Table 3). Dissolution of clay minerals into silicate and aluminate species may occur under such highly alkaline conditions (Hashemi et al, 2015), and pozzolanic reaction may take place (Metelková et al, 2012). Hence, such high pH conditions may be favourable for improved workability and reduced swelling and plasticity of soils, desirable for geotechnical applications.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to soil texture and CEC, also soil organic matter (SOM) content may influence the efficiency of lime application (Hashemi et al, 2015). Organic coatings on soil particles may inhibit the flocculation reaction by decreasing the availability of mineral surfaces for sorption of polyvalent ions (Cook and Batchelor, 1996).…”

Section: Resultsmentioning

confidence: 99%

“…However, the application of quicklime has so far not become a standard procedure in agricultural soil management, although it has recently been mentioned as 'structural lime' together with slaked lime applied to diminish P leaching (Bergström et al, 2015;Ulén and Etana, 2014). So far, lime-treatment stabilisation studies using quicklime have focused on engineering geology and civil engineering to improve fine textured soil in terms of engineering properties for earthwork projects (Cuisinier et al, 2011;Hashemi et al, 2015;Metelková et al, 2012). In this context, effective changes in soil properties, such as improvements in structure, stability, porosity, and aggregate strength, have been mentioned for silty and clayey soils (Little, 1995).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quicklime application instantly increases soil aggregate stability

Keiblinger

Bauer

Deltedesco

et al. 2016

International Agrophysics

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A b s t r a c t. Agricultural intensification, especially enhanced mechanisation of soil management, can lead to the deterioration of soil structure and to compaction. A possible amelioration strategy is the application of (structural) lime. In this study, we tested the effect of two different liming materials, ie limestone (CaCO 3 ) and quicklime (CaO), on soil aggregate stability in a 3-month greenhouse pot experiment with three agricultural soils. The liming materials were applied in the form of pulverised additives at a rate of 2 000 kg ha -1 . Our results show a significant and instantaneous increase of stable aggregates after quicklime application whereas no effects were observed for limestone. Quicklime application seems to improve aggregate stability more efficiently in soils with high clay content and cation exchange capacity. In conclusion, quicklime application may be a feasible strategy for rapid improvement of aggregate stability of fine textured agricultural soils.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quicklime application instantly increases soil aggregate stability

Keiblinger

Bauer

Deltedesco

et al. 2016

International Agrophysics

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“…It is available at low cost and generates a low ecological footprint. Raw bentonite can be improved by adding low percentages of lime, involving in short-term and long-term reactions [17]. Short-term reactions include ion exchange, flocculation and carbonation.…”

Section: Introductionmentioning

confidence: 99%

Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih

Bekkouch

Gharibi

et al. 2019

Sustain Environ Res

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Waste recycling with increasing the lifecycle of resource is a novel approach for enhancing circular economy. Within this context, this study aims to give a second life cycle to phosphogypsum (PG) waste, which is a byproduct from phosphoric acid manufacture, as useful resources. This study evaluates the sustainability of this harmful waste, which is accumulated in large stockpiles and becomes hazardous during storage, and to stabilize bentonite-based concrete intended for road construction. The effect of raw bentonite (Ca-Na montmorillonite), PG, and lime on the properties of cementitious materials has been investigated through various tests. The properties examined include chemistry (X-ray Fluorescence Spectrometry), mineralogy (X-ray Powder Diffraction and Fourier-Transform Infrared Spectroscopy), calorimetry (Differential Thermal Analysis/Thermogravimetry) and microstructure (Scanning Electron Microscopy) of the mortar based on different mixtures of bentonite, PG and lime. The result show that lime and PG addition involves in the formation of new nanocrystalline phases and the disappearance of certain minerals as portlandite. Calcium silicate hydrate gel appeared in the mixture with 8% of lime, whereas strätlingite was neoformed in the mixture with 8% of lime and 8% of PG. These nanocrystalline phases are responsible for enhancing mechanical strength through the pozzoloanic reaction.

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“…Focusing on scanning techniques allowing to obtain the microstructural phase arrangement, computed tomography (CT) nowadays allows addressing a variety of scales (micro-tomography or at higher scales) and of geomaterials such as soils [6], rocks [7] or mixtures [8]. Such investigations are devoted to their mechanical behaviour [7,8], to their transport properties [9]; or to coupled processes [10].…”

Section: Contextmentioning

confidence: 99%

Comparison of advanced discretization techniques for image-based modelling of heterogeneous porous rocks

et al. 2019

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This contribution presents an assessment of computational techniques enabling automated simulations of complex porous rocks microstructures based on 3D imaging techniques. A subset of a CT-scanned sandstone sample is used to compare the results obtained by two advanced discretization frameworks. Raw scan results are processed by a level set-based segmentation technique to produce smooth geometries prone to finite element discretizations. A recently developed technique is outlined for conforming mesh generation for complex porous geometries described implicitly by functions. This allows generating high quality tetrahedral meshes with selective refinement. Next to this, a technique that uses a kinematic enrichment by incompatible modes to represent the heterogeneous geometry is explained. Both techniques use the same implicit geometry as main input for the simulations. Mechanical simulations are conducted on a subset of a scanned sample of a sandstone under triaxial loading conditions for isotropic compressive loading and for loading conditions involving a stress deviator. The results are compared and discussed based on local stress distributions and on a Mohr-Coulomb criterion with tensile cut-off. The results show that both discretization strategies yield complementary tools and allow envisioning automated simulations based on raw CT scan data for porous rocks exhibiting complex pore space morphologies.

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Pore scale characterization of lime-treated sand–bentonite mixtures

Cited by 33 publications

References 36 publications

Quicklime application instantly increases soil aggregate stability

Quicklime application instantly increases soil aggregate stability

Phosphogypsum waste as additives to lime stabilization of bentonite

Comparison of advanced discretization techniques for image-based modelling of heterogeneous porous rocks

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