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Thermodynamic calculations for the salt crystallisation damage in porous built heritage using PHREEQC by D. Benavente; P. Brimblecombe; C. M. Grossi is a Environmental Science article available to read on EtoBox.

What is Thermodynamic calculations for the salt crystallisation damage in porous built heritage using PHREEQC about?

This work considers the crystallisation mechanisms of the most common and aggressive salts that generate stress in porous building stones as a result of changing ambient conditions. These mechanisms include the salt crystallisation that result from decreasing relative humidity and changes in temperature and, in hydrated salts, the dissolution of the lower hydrated form and the subsequent precipitation of the hydrated salt. We propose a new methodology for thermodynamic calculations using PHREEQC that includes these crystallisation mechanisms. This approach permits the calculation of the equilibrium relative humidity and the parameterization of the critical relative humidity and crystallisation pressures for the dissolution-precipitation transitions. The influence of other salts on the effectives of salt crystallisation and chemical weathering is also assessed. We review the sodium and magnesium sulphate and sodium chloride systems, in both single and multicomponent solutions, and they are compared to the sodium carbonate and calcium carbonate systems. The variation of crystallisation pressure, the formation of new minerals and the chemical dissolution by the presence of other salts

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Author

D. Benavente; P. Brimblecombe; C. M. Grossi

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 1866-6280)

Published

2015

Language

EN

Field

Environmental Science (Physical Sciences)