NDLI: Holistic approach of pre-existing flaws on the decay of two limestones.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Jacobs, P. Boone, M. A. De Kock, T. Dewanckele, J. De Boever, W. Dils, J. Van Hoorebeke, L. Cnudde, V. Brabant, L. Fronteau, G. Boone, M. N.
Description	Country affiliation: Belgium Author Affiliation: Dewanckele J ( Department of Geology and Soil Science - UGCT, Ghent University, Krijgslaan 281 S8, B-9000,Ghent, Belgium. jan.dewanckele@ugent.be)
Abstract	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.
ISSN	00489697
Journal	Science of The Total Environment
Volume Number	447
e-ISSN	18791026
Language	English
Publisher	Elsevier
Publisher Date	2013-03-01
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Science
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering

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