Conversion of calcium sulfate dihydrate into calcium phosphates as a route for conservation of gypsum stuccoes and sulfated marble

Sassoni, Enrico ; Graziani, Gabriela ; Franzoni, Elisa ; Scherer, George W. (2018) Conversion of calcium sulfate dihydrate into calcium phosphates as a route for conservation of gypsum stuccoes and sulfated marble. Construction and Building Materials, 170 . pp. 290-301. ISSN 0950-0618
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Abstract

To increase the water resistance of gypsum-based stuccoes (i.e., pastes and mortars), the possible conversion of gypsum into less soluble calcium phosphates (CaP), by reaction with an aqueous solution of diammonium hydrogen phosphate (DAP), was investigated. The effect of several reaction parameters (DAP concentration, ethanol addition to the DAP solution, pH) on nature and morphology of the new CaP was explored. For the most promising formulation, the ability to improve mechanical properties and reduce solubility in water of treated stuccoes was investigated. The treatment provided better results than ammonium oxalate (an inorganic treatment frequently used for consolidation, protection and de-sulphation of carbonate stones), but the high reaction speed limited the penetration depth and the performance of the DAP-treatment.

Abstract
Document type
Article
Creators
CreatorsAffiliationORCID
Sassoni, EnricoUniversity of Bologna, Italy0000-0003-0716-510X
Graziani, GabrielaUniversity of Bologna, Italy
Franzoni, ElisaUniversity of Bologna, Italy
Scherer, George W.Princeton University
Keywords
Hydroxyapatite Brushite Gypsum Marble Solubility Consolidation Protection Acid rain Cultural Heritage Stucco
Subjects
ISSN
0950-0618
DOI
Deposit date
25 May 2018 09:39
Last modified
28 May 2018 07:57
Project name
HAP4MARBLE - Multi-functionalization of hydroxyapatite for restoration and preventive conservation of marble artworks
Funding program
EC - H2020
URI

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