Three-dimensional image processing methods to identify and characterise aggregates in compacted asphalt mixtures

Kutay, M. Emin; Arambula, Edith; Gibson, Nelson; Youtcheff, Jack

doi:10.1080/10298431003749725

Cited by 116 publications

(28 citation statements)

References 21 publications

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“…A logical reason would be greater compaction producing a greater degree of orientation, however, this is not supported by the image analysis that showed a lower degree of orientation present in the most compact variant. As has been found in similar analysis of other materials [31] it is possible that high compaction could increase the misidentification of touching particles, as single particles, and thus this discrepancy, may be explained by a limitation of the method used.…”

Section: Discussionmentioning

confidence: 88%

The influence of the casting process on the internal structure and physical properties of hemp-lime

2016

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Bio-aggregate composites such as hemplime offer a more sustainable alternative to traditional walling infill material. Hemp-lime, whether in situ or prefabricated, is generally either cast or sprayed, which results in a directionally dependent, typically layered, physical structure. This paper considers the impact of compaction and layering on the directional thermal conductivity, compressive strength and internal structure of the material through use of a novel image analysis method. The results presented indicate that production variables have a significant, and crucially, directionally dependent impact on the thermal and mechanical properties of cast hemp-lime.

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Section: Discussionmentioning

confidence: 88%

The influence of the casting process on the internal structure and physical properties of hemp-lime

2016

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“…CT scanning has been applied to visualize and characterize the crack distribution, mineral dissemination, particle size distribution, porosity, particle shape and mineral exposure in many studies of different materials, such as sulfide ores and asphalt mixture [14,18,21,22]. CT can also be applied to analyze the mineral composition of individual particles [16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Copper Slag

et al. 2013

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Copper slag can be treated as a secondary resource since it usually contains a substantial amount of copper and other valuable metals. Characterization of the slags to determine the expected metal recovery is essential for the design of separation flow sheets. In this study, the chemical and mineralogical composition of a copper slag from El Teniente, Chile were characterized. The copper content of the fayalite based slag is around 0.87 wt% which is higher than for certain copper ores. Copper exists as sulfides in the form of droplets in the slag. The content and particle size distribution of the major sulfide phases (bornite, chalcopyrite and chalcocite) were quantified using analytical scanning electron microscopy (QEMSCAN). The copper bearing particles have a wide particle size distribution from a few microns up to mm level. Large copper bearing particles (> 100 μm) are composed mainly of bornite and chalcocite and tend to accumulate in the lower part of the slag layer. As characterized with X-ray computed tomography (CT), around 70 volume% of copper value exist in these large copper bearing particles.

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“…However, tomographic images of asphalt concrete must be obtained before using http image processing technique, thereafter, three dimensional finite element model (3D-FEM) can be reconstructed by digital image processing (DIP), and image analysis, such as fractal dimension of concrete cracks, can be investigated [7][8][9]. The advantage is that the reconstructed microstructures provide an effective representation for actual microstructure comparing with random generation method [10][11][12].…”

Section: Introductionmentioning

confidence: 99%