RT journal article
T1 Gypsum crust as a source of calcium for the consolidation of carbonate stones using a calcium phosphate-based consolidant
A1 Molina Piernas, Eduardo
A1 Rueda-Quero, Lucía
A1 Benavente, David
A1 Burgos-Cara, Alejandro
A1 Ruiz-Agudo, Encarnación
A1 Cultrone, Giuseppe
A2 Ciencias de la Tierra
K1 Gypsum crust
K1 Cleaning
K1 Consolidation
K1 Carbonate stone
K1 Calcium phosphates
AB The high levels of atmospheric pollution in cities today are causing the decay of natural building stone, especially due to the formation of gypsum crusts on carbonate stones. For this reason we have assessed the efficacy of using the gypsum crust as an alternative source of calcium in the consolidation of building stone via the formation of calcium phosphates. Samples of Arenisca Ronda (southern Spain) were altered to develop a gypsum crust on the surface for subsequent application of a cellulose poultice with a solution of dibasic ammonium phosphate 3 M (DAP) at different application times. The best results were obtained by the samples treated for 60 min and they have indicated that the application time and the water saturation degree of the poultice affect the amount of gypsum removed and the quantity of fissures on the consolidant film. On the other hand, the DAP concentration of the solution and the pH controlled the calcium phosphate precipitation phases. The habit of the calcium phosphate crystals evolve over the time tending to a homogenization of the consolidant film. This procedure offers an important alternative for the treatment of altered carbonate stones, in which the stone can be cleaned and consolidated in a single application.
PB Elsevier
SN 0950-0618
YR 2017
FD 2017
LK http://hdl.handle.net/10498/34878
UL http://hdl.handle.net/10498/34878
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026