4.7 Article

Neutron radiography and X-ray computed tomography for quantifying weathering and water uptake processes inside porous limestone used as building material

Journal

MATERIALS CHARACTERIZATION
Volume 88, Issue -, Pages 86-99

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2013.12.007

Keywords

Building stone; Weathering; Gypsum; Crust formation; X-ray computed tomography; Neutron radiography

Funding

  1. Agency for Promotion and Innovation by Science and Technology in Flanders, Belgium (IWT)

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Euville and Savonnieres limestones were weathered by acid test and this resulted in the formation of a gypsum crust. In order to characterize the crystallization pattern and the evolution of the pore structure below the crust, a combination of high resolution X-ray computed tomography and SEM-EDS was used. A time lapse sequence of the changing pore structure in both stones was obtained and afterwards quantified by using image analysis. The difference in weathering of both stones by the same process could be explained by the underlying microstructure and texture. Because water and moisture play a crucial role in the weathering processes, water uptake in weathered and non-weathered samples was characterized based on neutron radiography. In this way the water uptake was both visualized and quantified in function of the height of the sample and in function of time. In general, the formation of a gypsum crust on limestone slows down the initial water uptake in the materials. (C) 2013 Elsevier Inc. All rights reserved.

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