Journal
JOURNAL OF CULTURAL HERITAGE
Volume 19, Issue -, Pages 467-476Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.culher.2015.10.002
Keywords
Porous limestone; Consolidation; Barium hydroxide; DRMS
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Funding
- EU-Artech project - European Union Sixth Framework Programme [RII3- CT-2004-506171]
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The paper focuses on the study of barium hydroxide applied to two high porosity limestones from Portugal( Anc, a stone, with 27% porosity) and Italy (Lecce stone, with 37% porosity), both in the laboratory and onsite. The results show that barium hydroxide acts both through carbonation with atmospheric CO2 and by replacing calcium for barium in the calcite lattice followed by carbonation of the released calcium hydroxide. This double mechanism proved to be particularly efficient in the Anc, a limestone, possibly due to a higher reactivity linked to its smaller grain size. The mechanism is far slower than simple carbonation and has a better outcome when the stone can be totally immersed in the solution. Onsite experiments on the Anc, a stone were less striking than in the laboratory, possibly due to the insufficient amount of product made available for reaction, but a positive outcome was visible after six years of natural exposure. (C) 2015 Elsevier Masson SAS. All rights reserved.
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