Analysis of an Image-Based Method to Quantify the Size and Shape of Sand Particles

Altuhafi, Fatin N.; O’Sullivan, Catherine; Cavarretta, I.

doi:10.1061/(asce)gt.1943-5606.0000855

Cited by 296 publications

(105 citation statements)

References 56 publications

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“…This definition is effectively equal to the square root of circularity as defined by the International Standard ISO/DIS (2006) (Cavarretta et al, 2010). Although it is not the same value or definition it correlates well with the sphericity values in the Krumbein & Sloss (1963) visual identification chart as well as those in the chart proposed by Powers (1953) (Altuhafi et al, 2013). Convexity, Cx, describes the compactness of a particle and is calculated as the ratio of the projected particle area to the gross area including any re-entrant sections.…”

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confidence: 66%

“…The equipment used in this research was a QicPic (Sympatec, 2008), which can measure particle sizes between 1µm and 20mm while taking images at speeds of up to 500 frames/s at different particle image planes. A description of the apparatus has been given in detail by (Altuhafi et al, 2013).…”

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confidence: 99%

“…In their attempt to categorize the size and shape of granular materials using the laser imaging system Altuhafi et al (2013) found that in the Convexity-Sphericity plane, distinct zones could be identified depending on the material angularity classification. The zones of angularity proposed by Altuhafi et al have been used here for the preliminary categorization of each soil in Figure 1.…”

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confidence: 99%

“…Several Feret diameters can be calculated, but it was found that for most soils the Feret minimum gives the closest value to a sieve analysis and so this has been used throughout the current paper to represent size (Altuhafi et al, 2013). It is defined as the minimum distance between two parallel lines which touch the particle on opposite sides 6 in a 2D image.…”

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confidence: 99%

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Effect of Particle Shape on the Mechanical Behavior of Natural Sands

Altuhafi

Coop

Georgiannou

2016

J. Geotech. Geoenviron. Eng.

257

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A database of the mechanical behavior of 25 natural sands was compiled from the existing literature. Particle shape and size analysis, obtained by Dynamic Imaging Analysis, for each material in the database has subsequently been linked to its mechanical properties; selected sands were also subject to interferometry study for particle surface roughness measurements. This paper reviews the effect of the particle shape properties of these sands on their Critical State and stiffness parameters, introducing a new parameter to optimize the correlations.

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confidence: 66%

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confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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Effect of Particle Shape on the Mechanical Behavior of Natural Sands

Altuhafi

Coop

Georgiannou

2016

J. Geotech. Geoenviron. Eng.

257

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show abstract

“…Similar other studies were reported on the effect of particle size [14], surface hardness of the polymer [15], surface roughness [16], and normal stress [17] on the interface shear behavior of sands. There are many studies in which the particle morphology and classifications were done by the image based technologies [22][23][24]. The recent advancements in digital image technology provides an accurate estimation of the size and shape characteristics compared to conventional measurement techniques.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Size on the Friction and Interfacial Shear Strength of Sands of Similar Morphology

Vangla

Latha

2015

Int. J. of Geosynth. and Ground Eng.

135

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Size and morphological characteristics of particles play vital role on the shear and interfacial shear strength of sands. Often, effects of these parameters are merged and cannot be easily separated. Effect of size of the particles on the shear and interfacial shear strength of sands is presented in this paper through direct shear and interface direct shear tests complemented with image analyses and surface roughness studies. To eliminate the effect of morphological characteristics, three sands of different particle sizes with similar morphological characteristics like angularity, roundness, sphericity and roughness were selected for the study. These morphological characteristics for all three sands were determined from the analysis of scanning electron microscope images and were found to be similar for all three sands. It was observed from the symmetric direct shear tests that the particle size has no effect on the peak friction angle when the tests were carried out at same void ratio. However, ultimate friction angles were affected by the particle size. Shear band thickness was estimated from image segmentation analysis of the profiles of colored sand columns during shear and the same was correlated to the particle size. Interface direct shear tests were carried out on sand-geomembrane interfaces to study the effect of particle size on the interfacial shear strength. Microscopic images of geomembranes were captured after the interface shear tests to understand the change in surface roughness of the geomembrane due to particle indentations. Surface roughness studies on geomembrane samples after the tests confirmed that the plowing and groove formation on geomembranes during interface shear tests depend on the particle size as well as the relative roughness of the sand particles with respect to the membrane. Sand of medium particle size showed highest interfacial strength because of more number of effective contacts per unit area of the interface.

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Replicability of aggregate disruption by sonication—an inter‐laboratory test using three different soils from Germany

Graf‐Rosenfellner

Kayser

Guggenberger

et al. 2018

J. Plant Nutr. Soil Sci.

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Sonication is widely used for disruption of suspended soil aggregates. Calorimetric calibration allows for determining sonication power and applied energy as a measure for aggregate disrupting forces. Yet other properties of sonication devices (e.g., oscillation frequency and amplitude, sonotrode diameter) as well as procedure details (soil‐to‐water ratio, size, shape, and volume of used containers) may influence the extent of aggregate disruption in addition to the applied energy. In this study, we tested potential bias in aggregate disruption when different devices or procedures are used in laboratory routines. In nine laboratories, three reference soil samples were sonicated at 30 J mL−1 and 400 J mL−1. Aggregate disruption was estimated based on particle size distribution before and after sonication. Size distribution was obtained by standardized submerged sieving for particle size classes 2000–200 and 200–63 µm, and by dynamic imaging for particles < 63 µm. Despite differences in sonication devices and protocols used by the participants, only 16 in 216 tests of samples of the size fractions 2000–200 and 200–63 µm were identified as outliers. For the size fraction < 63 µm, fewer outliers were detected (8 in 324 tests). Four out of nine laboratories produced more than two outliers. In these laboratories, sonication devices differed from the others regarding oscillation frequencies (24 or 30 kHz compared to 20 kHz), sonotrode diameters (10 and 14 mm compared to 13 mm), and sonication power (16 W compared to > 45 W). Thus, these sonication device properties need to be listed when reporting on sonication‐based soil aggregate disruption. The overall small differences in the degree of disruption of soil aggregates between different laboratories demonstrate that sonication with the energies tested (30 and 400 J mL−1) provides replicable results despite the variations regarding procedures and equipment.

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Analysis of an Image-Based Method to Quantify the Size and Shape of Sand Particles

Cited by 296 publications

References 56 publications

Effect of Particle Shape on the Mechanical Behavior of Natural Sands

Effect of Particle Shape on the Mechanical Behavior of Natural Sands

Influence of Particle Size on the Friction and Interfacial Shear Strength of Sands of Similar Morphology

Replicability of aggregate disruption by sonication—an inter‐laboratory test using three different soils from Germany

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