Comparison of 2D and 3D image-based aggregate morphological indices

Kutay, M. Emin; Öztürk, Hande İşık; Abbas, Ala; Hu, Chichun

doi:10.1080/10298436.2011.575137

Cited by 69 publications

(10 citation statements)

References 11 publications

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“…In Figure 1, the inset images with white background and a black circle (which is B1) were captured by the camera and show the movement of bobber B1 from t = 0 s to t = 20 s toward the left (as B2 goes down). The center coordinate of the black circle was determined from a morphological labeling operation (18,19). This procedure was repeated for all consecutive images.…”

Section: Methodsmentioning

confidence: 99%

Sensitivity of Nozzle-Based Foamed Asphalt Binder Characteristics to Foaming Parameters

Öztürk

Kutay

2014

Transportation Research Record

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Foam-based warm-mix asphalt technologies decrease the overall viscosity of the asphalt mixture at lower temperatures so that it is workable during construction. However, after construction, viscosity increases rapidly as the foam disappears and the temperature drops. Although the production of the foamed binder is a relatively simple process, in which hot binder is mixed with a limited amount of water (typically 1% to 3% by weight of the binder), the rheology of the foamed binder is complex. The characteristics of foamed binders depend on various factors such as the binder type, grade, and modification; the foaming technology used; amount of water; and temperature. This study investigated the sensitivity of the characteristics of foamed binders to parameters such as injected air pressure and water content. The foamed binder characteristics, including the expansion ratio, half-life, foam index, bubble size distribution, and surface area index, were measured with a novel automated laboratory device called the asphalt foam collapse test. The measurements were conducted in several conditions, including ( a) constant water content and variable air pressure, ( b) variable water content and constant air pressure, and ( c) variable air pressure and water content. It was concluded that both water content and air pressure significantly affected foamed binder characteristics and their internal morphology.

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Section: Methodsmentioning

confidence: 99%

Sensitivity of Nozzle-Based Foamed Asphalt Binder Characteristics to Foaming Parameters

Öztürk

Kutay

2014

Transportation Research Record

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“…The form, angularity, and surface texture indices are computed with Equations 8 to 10. These indices should be normalized by dividing the equations by the first scalar coefficient, a 00 (i.e., l = 0, m = 0), to eliminate the size effect of the aggregate's particles (22). In this study, spherical harmonic analysis for index (Equation 8) was used to quantify the aggregates and compared with the form indices computed on the basis of the physical aggregate properties obtained from the 3-D laser scanning system.…”

Section: Spherical Harmonic Analysismentioning

confidence: 99%

Analytical and Laser Scanning Techniques to Determine Shape Properties of Aggregates

Komba

Anochie-Boateng

Steyn

2013

Transportation Research Record

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The fundamental shape attributes of aggregates used in pavements (i.e., form, angularity, and surface texture) have not been accurately quantified historically because of their irregular and nonideal shapes. This paper presents selected results from the use of a laser-based scanning technique to determine the form of aggregates employed in construction of pavements in South Africa. A three-dimensional (3-D) laser scanning system was used to examine aggregate materials from various sources, and the data were processed to reconstruct 3-D models of the aggregate particles. The models were further analyzed to determine the properties of the forms. Two analysis approaches based on physical properties of the aggregate and spherical harmonic analysis were employed to determine the form indices, and the results were compared. The indices based on the physical properties included (a) sphericity computed from the surface area and volume, (b) sphericity computed from three orthogonal dimensions, and (c) the flat-and-elongated ratio computed from the longest and shortest dimensions of an aggregate particle. Good correlations were observed between the form indices from the aggregate physical properties and the spherical harmonic form index. One conclusion of the research is that the laser scanning technique can be employed to quantify better the form properties of aggregate materials used in pavements.

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“…Researchers have conducted numerous studies to characterize the internal structure of asphalt mixtures via 2D and 3D imaging, for specific types of asphalt mixture. They used image analysis to evaluate orientation of the aggregate particles, aggregate gradation, and air void distribution [14][15][16][17]. Al-Omari et al [18] studied the relationship between the permeability of asphalt mixture and 3D distribution of voids.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Three-Dimensional Internal Structure Evolution in Asphalt Mixtures during Freeze–Thaw Cycles

Chen

Cai

et al. 2021

Applied Sciences

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This paper aims to characterize the three-dimensional (3D) internal structure evolution of asphalt mixtures under freeze–thaw cycles. Asphalt mixtures with three levels of design void content (3%, 5%, and 7%) were prepared in the laboratory. Subsequently, X-ray computed tomography (CT) tests were conducted to capture two-dimensional (2D) images of the internal structure of samples before and after freeze–thaw testing. A set of image processing techniques for reconstructing 3D images of the internal structure were utilized to extract the internal structure properties, which were then used to analyze the changes in the air void distributions and to evaluate the internal structure evolution under freeze–thaw cycles. 3D images reconstructed from X-ray CT images illustrated a dramatic degradation in the internal structure after cyclic freeze–thaw exposure. The change in internal structure occurs mainly in three ways: (1) expansion of existing individual voids, (2) combination of two separated air voids, and (3) generation of new voids. In addition, the parametric analysis of the three-dimensional reconstructed voids revealed that the asphalt mixture void ratio increased with the number of freeze–thaw cycles, while the larger the initial void content, the more pronounced the increase in the specimens. Therefore, asphalt mixture freeze–thaw resistance should be optimized in relation to the design void content.

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Comparison of 2D and 3D image-based aggregate morphological indices

Cited by 69 publications

References 11 publications

Sensitivity of Nozzle-Based Foamed Asphalt Binder Characteristics to Foaming Parameters

Sensitivity of Nozzle-Based Foamed Asphalt Binder Characteristics to Foaming Parameters

Analytical and Laser Scanning Techniques to Determine Shape Properties of Aggregates

Characterization of Three-Dimensional Internal Structure Evolution in Asphalt Mixtures during Freeze–Thaw Cycles

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