Wick action in porous building materials as studied by NMR

Author(s):Raheleh Pishkari, Leo Pel
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016 segment on
Historical Masonry
Editor(s): Inge Rörig-Dalgaard and Ioannis Ioannou
ISBN: 978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 150-157
Total Pages: 8
Language : English

Abstract: Salts crystallization is one of the main degradation mechanisms of historical objects like
masonry. In this study we looked at a special case for crystallization, i.e., wick action. This is
a steady state situation where one end of an object is continuously absorbing a salt solution,
whereas at the other side there is a continuous drying. As a result there will be a continuous
flux of ions to the surface resulting in a crystallization at the drying surface. In this study we
looked at wick action for both NaCl and Na2SO4 using a biomicritic limestone from Sardinia
where it is found in many cultural heritage objects. To measure both moisture and salt
simultaneously, we have used a specially designed Nuclear Magnetic Resonance (NMR)
instrument.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00