Particle Shape Estimates of Uniform Sands: Visual and Automated Methods Comparison

Muszynski, Mark R.; Vitton, Stanley J.

doi:10.1061/(asce)mt.1943-5533.0000351

Cited by 38 publications

(22 citation statements)

References 19 publications

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“…Because of such limitations, it would be useful for the practice of soil mechanics to employ existing visual approach. Muszynski and Stanley [42] have indicated that an engineer or technician can accurately characterize very angular sands, moderately rounded sands, and perfectly rounded sands using visual means. It is realized that this indication is also consistent with the observations made by Cho et al [21].…”

Section: Shear Stress (Kpa)mentioning

confidence: 99%

Stress fluctuations in granular material response during cyclic direct shear test

Çabalar

2015

Granular Matter

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This paper presents the results of an intensive series of experiments on various types of sands using cyclic direct shear testing apparatus. Two different grain shapes (rounded and angular) of sands having distinct sizes (0.25-0.5 and 1.0-2.0 mm) were tested in an automated constant normal load cyclic direct shear testing apparatus at an 100 kPa vertical effective stress, and two rates of shearing (2.0 and 0.025 mm/min). Experiments on the specimens resulted in sharp decreases followed by gradual increases in shear stress values. The results suggest that these successive drops and formations give a stick-slip nature to the fluctuations, which might be attributed mainly to the rate of loading, shape of grains, size of grains, and fines contents.

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Section: Shear Stress (Kpa)mentioning

confidence: 99%

Stress fluctuations in granular material response during cyclic direct shear test

Çabalar

2015

Granular Matter

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“…Sieving is a bulk approximation of particle size and cannot quantify the actual shape of particles, whereas an image-based analysis is more objective (e.g. Lee et al, 2007;Muszynski & Vitton, 2012;Altuhafi et al, 2013). However, many studies in the literature (e.g.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional characterisation of particle size and shape for ballast

Sun

Indraratna

Nimbalkar

2014

Géotechnique Letters

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The size and shape of particles influence how effectively coarse angular aggregates of ballast interact. The aim of this study was to improve the characterisation of ballast particles using a threedimensional (3D) imaging method. Various size and shape indices, such as elongation ratio, sphericity and roundness, were determined from the scanned 3D images. A modified index called 'ellipsoidness' was proposed to capture adequately the shape of the 3D particles. Variation of these indices with particle size was studied. Comparison of the 3D true sphericity and the corresponding two-dimensional sphericity indicated that the latter would underestimate sphericity. A modified approach for transforming particle size distribution to constriction size distribution is proposed by capturing the size and shape effects of particles.

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“…Muszynski and Vitto [38] proved that an engineer or technician can accurately characterize very angular sands, moderately rounded sands, and perfectly rounded sands using visual means. It is realized that this indication is also consistent with the observations made by Cho et al [37].…”

Section: Resultsmentioning

confidence: 99%

“…Some of the properties effected by shape are density, porosity, permeability, compressibility, shear strength [20,24,25,26,27,29,33,34,35,36]. Based on the information given in the study recently performed by Muszynski and Vitton [38], the authors have evaluated R using visual methods, and S using manual/ visual methods for a number of individual particle images of each four sands using binary images generated by Scanning Electron Micrography (SEM) and scanner. Accordingly, the R estimates for the crushed stone sand, and Trakya sand were obtained as 0.19, and 0.35; the S estimates were found as 0.56, and 0.65 relatively.…”

Section: Methodsmentioning

confidence: 99%

“…Grain shape also plays a significant role in the liquefaction potential [33]. Wadell [34], Krumbein [35], Powers [36], Holubec and D'appolonia [30], Youd [37], and Cho et al [38] have introduced detailed explanations of grain shape. Two independent properties are typically employed to describe the shape of a soil grain: (a) Roundness (R) is a measure of the extent to which the edges and corners of a grain has been rounded; (b) Sphericity (S) describes the overall shape of a grain.…”

Section: Introductionmentioning

confidence: 99%

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Influence of grain shape and gradation on the shear behavior of sand mixtures

Çabalar

2017

Scientia Iranica

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In this paper, triaxial and cyclic direct shear behaviour of different sand mixtures were investigated by considering variations of shape, size and mixture content. In most studies, investigations on stress-strain properties of soils are carried out using clean sands. However, granular soils in the field may contain a considerable amount of grains in different physical characteristics (i.e., shape, size). Therefore, behaviour of the various sand mixtures in triaxial compression and cyclic direct shear testing apparatuses has received attention in this study.Two different sizes (0.25 mm-0.5 mm, and 1.0 mm-2.0 mm) of sands with distinct shapes (rounded and angular) were tested in triaxial and cyclic direct shear apparatuses. The mixtures of coarser and finer geomaterials were tested in various mix ratio values from 5% to 50% by weight. Based on the examinations during shearing of these materials, it was observed that behavior of the sand mixtures are closely related to the grain shape of host materials as well as fines content in both testing apparatuses, whilst size of the sands was not found to be significantly effective on the results.

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Particle Shape Estimates of Uniform Sands: Visual and Automated Methods Comparison

Cited by 38 publications

References 19 publications

Stress fluctuations in granular material response during cyclic direct shear test

Stress fluctuations in granular material response during cyclic direct shear test

Three-dimensional characterisation of particle size and shape for ballast

Influence of grain shape and gradation on the shear behavior of sand mixtures

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