Simulation and Test Procedures to correlate Structural Damage with Moisture and Salts Migration in Masonry

  • C. Colla
  • P. Baldracchi
  • A. Troi
  • F. Ubertini
  • R. Carli
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 6)


In historic masonry structures – focus of the 7FP European project SMOOHS – the monitoring and effects of environmental agents in walls and of structural problems is being investigated in a joint perspective. Numerical simulations and experimental work aim to correlate the decay effects of moisture and salt transport in masonry, with structural damage. To better address the problem, a cross-feeding collaboration is set up between numerical and experimental studies. Initial experimental data obtained in the lab on masonry materials become the main input data for hygro-thermal simulations of behaviour of masonry specimens in aggressive environment, that is solutions of sodium sulphate (Na2SO4). Simulation output helps to improve the experimental accelerated ageing procedures. Later, the salt damage process development in these specimens and their reduced structural capacity will be mechanically evaluated. A function relating these parameters will couple hygrothermal and structural simulations to predict a structural damage index for historical buildings.


Historical masonry Hygrothermal analysis Laboratory test Laboratory test Salt migration Structural damage index 



Dr Michel Chapuis, project officer of the SMooHS project ( is gratefully acknowledged.


  1. [1].
    Collepardi, M., (1990), Degradation and restoration of masonry walls of historical buildings, Mater. Struct., 23 (134), pp. 81–102.CrossRefGoogle Scholar
  2. [2].
    Binda, L., Baronio, G., (1998), Crystallization test by total immersion of specimens, Mater. Struct., 31, pp.10–15.CrossRefGoogle Scholar
  3. [3].
    Theoulakis, P., Moropoulou, A., (1999), Salt crystal growth as weathering mechanism of porous stone on historic masonry, J. porous Mater., 6, pp. 345–358.CrossRefGoogle Scholar
  4. [4].
    Rodriguez-Navarro, C. et al., (2000), How does sodium sulfate crystallize? Cem. and Concrete Res., 30, pp. 1527–1534.CrossRefGoogle Scholar
  5. [5].
    Lubelli, al. (2004), The role of salt in the occurrence of different damage mechanisms and decay patterns on brick masonry, Constr. Build. Mater., 18, 119–124.CrossRefGoogle Scholar
  6. [6].
    Binda, L., Colla, C. et al. (1994), Identification of moisture capillarity in masonry using digital impulse radar, J. Constr. & Build. Mater., vol.8, No.2, pp. 101–107.CrossRefGoogle Scholar
  7. [7].
    Steiger, M. et al. (2008), Crystallization of sodium sulphate phases in porous materials: The phase-diagram Na2SO4-H2O and the generation of stress, Geochimica et Cosmochimica, Acta 72, pp. 4291–4306.CrossRefGoogle Scholar
  8. [8].
    UNI EN 15801:2010, Conservation of cultural property, Test methods-Determination of water absorption by capillarity, February 2010, pp.14.Google Scholar
  9. [9].
    UNI EN 1925:2000, Natural stone test methods – Determination of water absorption coefficient by capillarity, December, 2000, pp.16.Google Scholar
  10. [10].
    An expert chemical model for determining the environmental conditions needed to prevent salt damage in porous materials, Final Report – Project ENV4-CT95-0135 (1996–2000)Google Scholar

Copyright information

© RILEM 2013

Authors and Affiliations

  • C. Colla
    • 1
  • P. Baldracchi
    • 2
  • A. Troi
    • 2
  • F. Ubertini
    • 1
  • R. Carli
    • 1
  1. 1.DICAM Department, Engineering FacultyUniversity of BolognaBolognaItaly
  2. 2.EURAC – Institute for Renewable EnergyBolzanoItaly

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