Particle classification and intra-particle pore structure of carbonate sands

Zhou, Bo; Ku, Quan; Wang, Huabin; Wang, Jianfeng

doi:10.1016/j.enggeo.2020.105889

Cited by 57 publications

(10 citation statements)

References 36 publications

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“…While the dilation algorithm in Avizo adds voxels to all solid surfaces, thus filling inner pores, the erosion algorithm removes them again to restore the outer specimen surfaces. Similar procedures have been proposed by [1] and [20] for measuring the bulk volume of a specimen in a triaxial test and by [45] to analyse the intra-particle pores in carbonate sands. The pores at the boundaries of the sample (top, bottom and lateral boundaries) are also filled by this morphological image processing operation, leaving a surface resembling to a smooth membrane strained over a granular specimen.…”

Section: Global Measurements From Ct Datamentioning

confidence: 95%

Quantitative 3D imaging of partially saturated granular materials under uniaxial compression

et al. 2021

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Gauging the mechanical effect of partial saturation in granular materials is experimentally challenging due to the very low suctions resulting from large pores. To this end, a uniaxial (zero radial stress) compression test may be preferable to a triaxial one where confining pressure and membrane effects may erase the contribution of this small suction; however, volume changes are challenging to measure. This work resolves this limitation by using X-ray imaging during in situ uniaxial compression tests on Hamburg Sand and glass beads at three different initial water contents, allowing a suction-dependent dilation to be brought to the light. The acquired tomography volumes also allow the development of air–water and solid–water interfacial areas, water clusters and local strain fields to be measured at the grain scale. These measurements are used to characterise pertinent micro-scale quantities during shearing and to relate them to the measured macroscopic response. The new and well-controlled data acquired during this experimental campaign are hopefully a useful contribution to the modelling efforts—to this end they are shared with the community.

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Section: Global Measurements From Ct Datamentioning

confidence: 95%

Quantitative 3D imaging of partially saturated granular materials under uniaxial compression

et al. 2021

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“…Grains within a loosely packed matrix have a lower coordination number, whereas grains within a more densely packed matrix have a higher coordination number [51,52]. The influence of discrete contact on isolated crushing is studied by changing the number of support particles to change the number of contacts, which is the coordination number, in order to mimic real assembly conditions at grain scale.…”

Section: Influence Of Coordination Number On Particle Strengthmentioning

confidence: 99%

Effect of Particle Size and Constraint Conditions on Single Particle Strength of Carbonate Sand

Cai

Gao

et al. 2022

Sensors

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Carbonate sand is often encountered and utilized as construction material in offshore engineering projects. Carbonate sand particles, which are porous and angular, are found to be highly crushable under high stress conditions, whereas the mechanisms and controlling factors for the crushing of carbonate sand particles are not well developed. The crushability and particle strength of around 400 particles from three fractions (5–10 mm, 2–5 mm, and 1–2 mm) of carbonate sand from the South China Sea were investigated via grain-scale single particle crushing tests. Special emphasis was placed on the effect of external constraint conditions (i.e., coordination number) and intrinsic particle morphology characteristics on the particle strength of carbonate soil. The particle strength of carbonate sand was found to be around half of quartz sand in terms of characteristic stress. Negative correlations, which could be depicted by an exponential equation, were found between the particle size and particle strength. Due to elongated particle shape and tensile stress concentration, a higher coordination number may lower the particle strength, which contradicts what was reported for quartz sands. A series of seven fundamental particle dimensions and five particle shape descriptors was characterized, and the aspect ratio was found to be one of the more influential shape descriptors for particle strength. The results enriched the database for the analysis of highly irregular geomaterial and provided insights into controlling factors of particle strength and crushing mechanisms of the carbonate sand.

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“…Next, the dimensions of the principal directions were calculated, including the long, intermediate, and short axes, abbreviated as a, b, and c, respectively. An improved triangular Zingg diagram [51] has been shown to be an effective method for classifying the morphologies of irregular particles [52], in which three dimensions of the aspect ratio and four classes of morphological characteristics (compact, platy, elongated, bladed) are considered.…”

Section: Characterization Of Particle Morphologymentioning

confidence: 99%

Effect of Binder Coatings on the Fracture Behavior of Polymer–Crystal Composite Particles Using the Discrete Element Method

Wang

et al. 2021

Coatings

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Polymer–crystal composite particles formed by crystals coated with binders are widely used in the fields of medicine, energy, the chemical industry, and civil engineering. Binder content is an important factor in determining the mechanical behavior of composite particles. Therefore, this study aimed to investigate the underlying effect of binder coatings in the fracture micromechanics of polymer–crystal composite particles using the discrete element method (DEM). To achieve this objective, realistic particle and crystal shapes were first obtained and reconstructed based on X-ray micro-computed tomography (μCT) scanning and scanning electron microscope (SEM) images. A series of single particle crushing tests and DEM simulations were conducted on real and reconstructed polymer–crystal composite particles, respectively. Based on the experimental and DEM results, the effect of binder coatings on the crushing strength and crushing patterns of polymer–crystal composite particles was measured. Moreover, the micromechanics of the development and distribution of microcracks was further investigated to reveal the mechanism by which binder coatings affect polymer–crystal composite particles.

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Particle classification and intra-particle pore structure of carbonate sands

Cited by 57 publications

References 36 publications

Quantitative 3D imaging of partially saturated granular materials under uniaxial compression

Quantitative 3D imaging of partially saturated granular materials under uniaxial compression

Effect of Particle Size and Constraint Conditions on Single Particle Strength of Carbonate Sand

Effect of Binder Coatings on the Fracture Behavior of Polymer–Crystal Composite Particles Using the Discrete Element Method

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