Diammonium hydrogenphosphate (DAP) is a water soluble consolidant for decayed carbonatic materials of historical buildings. The reaction of DAP solutions with polycrystalline calcite of marbles is non-stoichiometric and forms a calcium phosphates mixture whose identification is tricky and controversial. This study investigated how the DAP molarity, the treatment method and the microstructure of the stone influence the formation of specific phases. Thermal treatments and cutting-edge techniques (XRD with synchrotron radiation in transmitting geometry and high resolution FTIR microspectroscopy) were used to overcome the analytical limits of the more conventional methods, shading light to an in depth evaluation of DAP consolidating processes and treatment conditions.
Diammonium hydrogenphosphate for the consolidation of building materials : investigation of newly-formed calcium phosphates / E. Possenti, C. Colombo, C. Conti, L. Gigli, M. Merlini, J.R. Plaisier, M. Realini, D. Sali, G.D. Gatta. - In: CONSTRUCTION AND BUILDING MATERIALS. - ISSN 0950-0618. - 195(2019 Jan 20), pp. 557-563.
Diammonium hydrogenphosphate for the consolidation of building materials : investigation of newly-formed calcium phosphates
E. Possenti
Primo
Writing – Original Draft Preparation
;M. Merlini;G.D. GattaUltimo
Supervision
2019
Abstract
Diammonium hydrogenphosphate (DAP) is a water soluble consolidant for decayed carbonatic materials of historical buildings. The reaction of DAP solutions with polycrystalline calcite of marbles is non-stoichiometric and forms a calcium phosphates mixture whose identification is tricky and controversial. This study investigated how the DAP molarity, the treatment method and the microstructure of the stone influence the formation of specific phases. Thermal treatments and cutting-edge techniques (XRD with synchrotron radiation in transmitting geometry and high resolution FTIR microspectroscopy) were used to overcome the analytical limits of the more conventional methods, shading light to an in depth evaluation of DAP consolidating processes and treatment conditions.File | Dimensione | Formato | |
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2019 Diammonium hydrogenphosphate for the consolidation of building materials.pdf
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