skip to main content

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

Euville and Savonnières 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. - Highlights: • Time lapse sequence in 3D of changing pore structures inside limestone • A combination of X-ray CT, SEM and neutron radiography was used. • Quantification of water content in function of time, height and weathering • Characterization of weathering processesmore » due to gypsum crystallization.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5] ; ;  [1]
  1. Department of Geology and Soil Science—UGCT, Ghent University, Krijgslaan 281 S8, B-9000 Ghent (Belgium)
  2. University of Reims Champagne-Ardenne (URCA), GEGENAA, EA3795 Reims (France)
  3. Chair of Building Physics, ETH Zurich, HIL E 47.2, Wolfgang-Pauli-Strasse 15, 8093 Zürich Hönggerberg (Switzerland)
  4. Spallation Neutron Source Division, Paul Scherrer Institut (PSI), Villigen (Switzerland)
  5. Department of Physics and Astronomy—UGCT, Ghent University, Proeftuinstraat 86, B-9000 Ghent (Belgium)
Publication Date:
OSTI Identifier:
22288741
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 88; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BUILDING MATERIALS; COMPUTERIZED TOMOGRAPHY; CRYSTALLIZATION; GYPSUM; HUMIDITY; IMAGE PROCESSING; LIMESTONE; NEUTRON RADIOGRAPHY; PORE STRUCTURE; POROUS MATERIALS; TIME DEPENDENCE; WATER; WEATHERING; X RADIATION