Micro-structural and volumetric behaviour of bimodal artificial soils with aggregates

Kühn, Vinícius de Oliveira; Lopes, Bruna de Carvalho Faria Lima; Caicedo, Bernardo; Cordão-Neto, Manoel Porfírio

doi:10.1016/j.enggeo.2021.106139

Cited by 12 publications

(12 citation statements)

References 45 publications

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“…After the correlation analysis of micro-pore parameters and macro-crack parameters, it is found that they have a high correlation. This is consistent with the research conclusion mentioned in the introduction [ 11 , 12 ].…”

Section: Discussionsupporting

confidence: 93%

“…With the increase in the roughness coefficient, the normal stress on the crack surface increases gradually, while the peak value of the initial shear stress increases as well [ 9 , 10 ]. Under the influence of the alternations of drying and wetting, the pore change, geometric shape, spatial distribution, and connectivity in the soil have great influences on the soil structure and crack evolution [ 11 , 12 ]. In recent years, more and more studies have been carried out on the micro-characteristic parameters of soils, such as porosity, average pore diameter, pore volume, and other parameters.…”

Section: Introductionmentioning

confidence: 99%

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Study on Crack Development and Micro-Pore Mechanism of Expansive Soil Improved by Coal Gangue under Drying–Wetting Cycles

Zhu

Zhang

et al. 2021

Materials

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Expansive soil is prone to cracks under a drying–wetting cycle environment, which brings many disasters to road engineering. The main purpose of this study is use coal gangue powder to improve expansive soil, in order to reduce its cracks and further explore its micro-pore mechanism. The drying–wetting cycles test is carried out on the soil sample, and the crack parameters of the soil sample are obtained by Matlab and Image J software. The roughness and micro-pore characteristics of the soil samples are revealed by means of the Laser confocal 3D microscope and Mercury intrusion meter. The results show that coal gangue powder reduces the crack area ratio of expansive soil by 48.9%, and the crack initiation time is delayed by at least 60 min. Coal gangue powder can increase the internal roughness of expansive soil. The greater the roughness of the soil, the less cracks in the soil. After six drying–wetting cycles, the porosity and average pore diameter of the improved and expanded soil are reduced by 37% and 30%, respectively, as compared to the plain expansive soil. By analyzing the cumulative pore volume and cumulative pore density parameters of soil samples, it is found that the macro-cracks are caused by the continuous connection and fusion of micro-voids in soil. Coal gangue powder can significantly reduce the proportion of micro-voids, cumulative pore volume, and cumulative pore density in expansive soil, so as to reduce the macro-cracks.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Study on Crack Development and Micro-Pore Mechanism of Expansive Soil Improved by Coal Gangue under Drying–Wetting Cycles

Zhu

Zhang

et al. 2021

Materials

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“…The presence of aggregates promotes double porosity (bimodal fabric), characterized by two dominant pore sizes, where the smaller porosity is formed by intra-aggregate pores and the larger porosity is formed by inter-aggregate pores (Alonso, 1998;Kühn et al, 2021b;Mitchell and Soga, 2005;Romero and Simms, 2008). Bimodal soils produced in laboratory from Kaolin and Bentonite clay show changes in both micro and macro-pores region when subjected to loading or wetting/drying paths (Cui et al, 2002;Nguyen et al, 2020;Romero, 2013;Thom et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The aggregates are produced under controlled conditions in the lab by compacting Kaolin Clay, which allows for nonmineralogical variability. The methodology for producing the bimodal samples is the same adopted by Kühn et al (2021b). Samples with different aggregate contents are created and subjected to unidimensional consolidation, then the sample´s fabrics are investigated by means of Mercury Intrusion Porosimetry (MIP) and Scanning Electron Microscopy (SEM).…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviour of bimodal kaolin clay with aggregates

Kühn

Lopes

Caicedo

et al. 2022

Engineering Geology

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“…Microstructural evaluation based on Mercury Intrusion Porosimetry (MIP) and Scanning Electron Microscopy (SEM) tests has been used to measure soil fabric quantitatively and qualitatively. Soil fabric can assume pore size distributions that vary from mono-modal to multi-modal (more than two dominant pore sizes), however mono-modal and bimodal (two dominant pore sizes) distributions are the most widely reported (Kühn et al, 2021;Romero, 2013;Pedrotti & Tarantino, 2014;Miguel & Bonder, 2012;Delage et al, 1996). Highly weathered lateritic tropical soils present bimodal pore size distributions for both intact and compacted samples (Santos & Esquivel, 2018;Otálvaro, Cordão-Neto & Caicedo, 2015;Cordão Neto et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Relationship between pore-size distribution and compressibility of a lateritic soil

Kühn

Lopes

Borges

et al. 2021

Géotechnique Letters

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The aim of this paper is to evaluate the relationship between pore-size distribution and compressibility of a lateritic soil. Soil fabric was analysed under different conditions of preparation: compacted, reconstituted and intact, by means of mercury intrusion porosimetry tests on loading to different stress levels. The results show that all samples present bimodal pore distribution. However, the conditions of preparation and loading affected macropores more intensely, with subtle effects on micropores. This behaviour was attributed to the presence of aggregations with cementation. The compression curve of macro and micropores were determined and it was observed that the compression curve of macropores is very similar to the compression curve of the samples. In addition, it was observed that the fabric parameter regarding the uniformity of macro and micropores changed during loading. The new fabric parameter proposed captures the change in pore uniformity with loading. This parameter appears to be related to the soil compressibility, indicating that the most compressible samples also show greater changes in the uniformity of macropores.

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Micro-structural and volumetric behaviour of bimodal artificial soils with aggregates

Cited by 12 publications

References 45 publications

Study on Crack Development and Micro-Pore Mechanism of Expansive Soil Improved by Coal Gangue under Drying–Wetting Cycles

Study on Crack Development and Micro-Pore Mechanism of Expansive Soil Improved by Coal Gangue under Drying–Wetting Cycles

Mechanical behaviour of bimodal kaolin clay with aggregates

Relationship between pore-size distribution and compressibility of a lateritic soil

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