Fractal parameter approach on weathering grade determination of Çe?me (Izmir, Turkey) tuffs |
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Authors: | C K?ncal M Y Koca G Ozden N Demirbasa |
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Affiliation: | (1) Department of Geographical and Earth Sciences, University of Glasgow, G12 8QQ Glasgow, Scotland, UK;(2) Engineering Faculty, Geological Engineering Department, Dokuz Eylul University, 35160 Buca, Izmir, Turkey;(3) Civil Engineering Department, Engineering Faculty, Dokuz Eylul University, 35160 Buca, Izmir, Turkey;(4) Geographical Information Systems Department, Izmir Governor’s Office, Disaster and Emergency Management Center, Konak, Izmir, Turkey |
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Abstract: | Tuffs, classified as weak rock to hard soil with respect to their strength, slake on exposure, hence engineering problems
occur as they weather and loosen. Weathering grades were determined in the field and in the laboratory using petrographic,
chemical, physico-mechanical, P-wave velocity, and slake durability measures. Strong correlations were found between chemical
weathering index, average porosity and fractal parameters based on the slake durability test results. The shapes of the tuff
particles before and after the slaking test were investigated using the fractal dimension method to explain numerically the
variations of the surface characteristics of the test samples due to weathering. Two fractal parameters are proposed for the
second and fifth cycles of the slake durability test. The study has shown that for assessing the weathering state of tuffs,
the fractal dimension approach could be a more effective tool than other methods of weathering grade determination. |
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