Characterizing saline uptake and salt distributions in porous limestone with neutron radiography and X-ray micro-tomography

Samples of Savonnières limestone subjected to repeated wetting–drying cycles were investigated by both neutron radiography and X-ray micro-tomography to collect information on saline uptake and salt precipitation. Capillary uptake of water, 1.4 molal sodium sulphate and 5.8 molal sodium chloride solution was visualized with neutron radiography. The liquid penetration coefficients and diffusivities were determined and are markedly lower for the salt solutions than for water, due to the higher surface tension and viscosity of salt solutions. Halite distributions were derived from neutron radiographs. Porosity analysis of X-ray tomographic datasets allowed quantifying thenardite distributions and porosity decrease due to salt crystallization.

[1]  R. Hassanein.  Correction methods for the quantitative evaluation of thermal neutron tomography , 2006 .

[2]  M. Krus,et al.  Determination of moisture and salt content distributions by combining NMR and gamma ray measurements , 2000 .

[3]  Shane Latham,et al.  Automated registration for augmenting micro-CT 3D images , 2008 .

[4]  J. Petkovic.  Moisture and ion transport in layered porous building materials : a nuclear magnetic resonance study , 2005 .

[5]  E. W. Washburn.  The Dynamics of Capillary Flow , 1921 .

[6]  W. D. Hoff,et al.  Water Transport in Brick, Stone and Concrete , 2002 .

[7]  François Bertrand,et al.  Damage in porous media due to salt crystallization. , 2010, Physical review. E, Statistical, nonlinear, and soft matter physics.

[8]  H. W. Reinhardt,et al.  Penetration and permeability of concrete : barriers to organic and contaminating liquids : state-of-the-art report prepared by members of the RILEM Technical Committee 146-TCF , 1997 .

[9]  Michiel Dusar,et al.  Historical building stones in the province of Limburg (NE Belgium): role of petrography in provenance and durability assessment , 2004 .

[10]  Khurshid Ali,et al.  Concentration and temperature dependence of surface parameters of some aqueous salt solutions , 2006 .

[11]  E. Lehmann,et al.  Methods of scattering corrections for quantitative neutron radiography , 2005 .

[12]  Hans Janssen,et al.  An improved moisture diffusivity model for porous building materials , 2007 .

[13]  H. Ezzat Khalifa,et al.  Tables of the Dynamic and Kinematic Viscosity of Aqueous KCl Solutions in the Temperature Range 25-150 C and the Pressure Range 0.1-35 MPa, , 1981 .

[14]  Jan Carmeliet,et al.  Determination of the Liquid Water Diffusivity from Transient Moisture Transfer Experiments , 2004 .

[15]  Robert J. Flatt,et al.  Salt damage in porous materials: how high supersaturations are generated , 2002 .

[16]  P. Vontobel,et al.  PROPERTIES OF THE RADIOGRAPHY FACILITY NEUTRA AT SINQ AND ITS POTENTIAL FOR USE AS EUROPEAN REFERENCE FACILITY , 2001 .

[17]  Jan Carmeliet,et al.  Analysis of moisture flow in porous materials using microfocus X-ray radiography , 2006 .

[18]  Mirko Boin,et al.  Compensation of ring artefacts in synchrotron tomographic images. , 2006, Optics express.

[19]  C. Grünzweig,et al.  The ICON beamline – A facility for cold neutron imaging at SINQ , 2011 .

[20]  Hannelore Derluyn,et al.  Salt transport and crystallization in porous limestone , 2012 .

[21]  Veerle Cnudde,et al.  Three-Dimensional Analysis of High-Resolution X-Ray Computed Tomography Data with Morpho+ , 2011, Microscopy and Microanalysis.

[22]  L. Feldkamp,et al.  Practical cone-beam algorithm , 1984 .

[23]  Ioannis Ioannou,et al.  Water repellent influence on salt crystallisation in masonry , 2008 .

[24]  Jan Carmeliet,et al.  A Comparison of Different Techniques to Quantify Moisture Content Profiles in Porous Building Materials , 2004 .

[25]  Jan Carmeliet,et al.  Modelling Unsaturated Moisture Transport in Heterogeneous Limestone , 2003 .