Holistic approach of pre-existing flaws on the decay of two limestones
Autor: | W. De Boever, Gilles Fronteau, Matthieu Boone, Marijn Boone, Jeroen Dils, Jan Dewanckele, T. de Kock, Patric Jacobs, Loes Brabant, L. Van Hoorebeke, Veerle Cnudde |
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Přispěvatelé: | Universiteit Gent = Ghent University [Belgium] (UGENT), Groupe d'Étude sur les Géomatériaux et Environnements Naturels, Anthropiques et Archéologiques - EA 3795 (GEGENAA), Université de Reims Champagne-Ardenne (URCA)-SFR Condorcet, Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Université de Reims Champagne-Ardenne (URCA)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Maison des Sciences Humaines de Champagne-Ardenne (MSH-URCA), Université de Reims Champagne-Ardenne (URCA)-Université de Reims Champagne-Ardenne (URCA) |
Rok vydání: | 2013 |
Předmět: |
Environmental Engineering
Gypsum Thin section Noyant stone [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Limestones Mineralogy Weathering 010501 environmental sciences engineering.material 010502 geochemistry & geophysics Natural building stone 01 natural sciences [SPI.MAT]Engineering Sciences [physics]/Materials Matrix (geology) Lede stone Spheroidal weathering Environmental Chemistry [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology Biology Waste Management and Disposal 0105 earth and related environmental sciences Cement Honeycomb weathering Gypsum crystallization Time lapse X-ray CT Pollution Chemistry Bioclast [SDE]Environmental Sciences engineering Freeze–thaw weathering Geology |
Zdroj: | The science of the total environment Science of the Total Environment Science of the Total Environment, Elsevier, 2013, 447, pp.403-414. ⟨10.1016/j.scitotenv.2012.12.094⟩ |
ISSN: | 0048-9697 1879-1026 |
Popis: | This study aims to understand the influence of the microfacies and the determination of pre-existing flaws on the weathering behavior of two types of limestones. Therefore, both Lede and Noyant limestones were independently weathered by strong acid tests and freeze-thaw cycles. In order to characterize the weathering patterns inside the stones, a combination of high resolution X-ray CT, SEM-EDS and thin section microscopy was used. The advantage of high resolution X-ray CT is its non-destructive character and the obtained 3D structural information. By using this technique, a time-lapse sequence of the weathering patterns was obtained for both gypsum crust formation as well as crack formation due to freezing and thawing. This way, a clear link could be made with the initial non-weathered state. Thin section microscopy and SEM-EDS provided additional chemical information. The focus of this study lies in the processes that occur in the bioclast fragments in the stone and the influence of the surrounding cement or matrix. The results show that weathering patterns vary for both limestones although the causes of weathering were similar. In case of the Noyant stone, the weathering by crystallizing gypsum was mainly restricted to the microporous matrix of the stone, while in case of the Lede stone, several foraminifera and shell fragments were preferentially recrystallized. In general, the underlying microstructure determines the weathering pattern of the stone. (C) 2013 Elsevier B.V. All rights reserved. |
Databáze: | OpenAIRE |
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