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Characterisation of size, shape and texture of aggregates by fourier analysis of 3-D-laser images
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Engineering Geology and Geophysics.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Engineering Geology and Geophysics.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Engineering Geology and Geophysics.
2018 (English)In: ISRM International Symposium 2000, IS 2000, International Society for Rock Mechanics , 2018Conference paper, Published paper (Refereed)
Abstract [en]

A new method for analysis of size, shape and roughness of aggregates based on a 3-D-laser-digitising technique is presented. Measurements of aggregate particles are carried out by a system consisting of a laser sensor and a co-ordinate-measuring machine; the accuracy of the system is ±50 µm. Scanned data are processed to create a digital image of aggregates to be employed in further analyses. Size, shape and volume analysis of particles has been conducted in two ways. A so-called geometrical analysis is based on simple applications of analytical geometry. Another method consists of the Fourier transform analysis of the topography of the two halves of the sample defined by a plane intersecting its mass center. Three-dimensional spectra are obtained as a function of two frequencies along the co-ordinate axes. The cross-sections of the spectrum are then investigated and the pattern of the power spectra gives the dimensions and shape of the particles. When comparing the results from these two methods, a very good agreement is obtained. From the spectrum, the texture component can be identified, which gives the roughness of the particles' surfaces. The new technique by Fourier transform analysis is promising giving repeatable results and performing a combined shape-size-texture analysis of the aggregate particles. .

Place, publisher, year, edition, pages
International Society for Rock Mechanics , 2018.
Keywords [en]
Aggregates, Fourier analysis, Fourier transforms, Image analysis, Aggregate particles, Analytical geometry, Fourier transform analysis, Geometrical analysis, Repeatable results, Shape and textures, Texture analysis, Texture components, Particle size analysis
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-236438Scopus ID: 2-s2.0-85053941193OAI: oai:DiVA.org:kth-236438DiVA, id: diva2:1258722
Conference
ISRM International Symposium 2000, IS 2000, 19 November 2000 through 24 November 2000
Note

QC 20181025

Available from: 2018-10-25 Created: 2018-10-25 Last updated: 2018-12-04Bibliographically approved

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Stephansson, Ove

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