Cit:Franzoni.etal:2021
| Autor | Franzoni, E.; Sassoni, E.; Marrone, C. |
| Jahr | 2021 |
| Titel | Development of hydroxyapatitechitosan-based treatments for the mitigation of salt damage in globigerina limestone |
| Bibtex | @inproceedings { Franzoni.etal:2021,
title = {Development of hydroxyapatitechitosan-based treatments for the mitigation of salt damage in globigerina limestone }, booktitle = {Proceedings of SWBSS 2021 – Fifth International Conference on Salt Weathering of Buildings and Stone Sculptures}, year = {2021}, editor = {Lubelli, B.; Kamat, A.A.; Quist, W.J.}, pages = {233-240}, publisher = {TU Delft Open}, note = {Many soft limestones used in heritage buildings in the Mediterranean area are af fected by salt crystallization, leading to alveolization and dramatic stoneloss. To fight saltinduced deterioration of stone, different treatments were recently proposed, aimed at modifying the crystallization of salts during either the nucleation or growth of the crystals. In particular, strategies based on crystallization inhibitors and promoters were studied in the literature. In this paper, a new two-step treatment was applied to Globigerina limestone samples. The treatment consists in the application of an aqueous solution based on diammonium hydrogen phosphate, followed by the application of a chitosan solution. The first one produces aninorganic layer of calcium phosphate phases (mainly hydroxyapatite) and is aimed not only at consolidating the stone and preventing calcite dissolution, but also at providing a rough anchoring substrate for chitosan. The second layer is formed by chitosan, a biopolymer that was shown to have an inhibiting action on the crystallization of sodium sulphate. The two solutions were applied to the limestone samples both alone and combined, adopting different concentrations.The effects of the treatments were investigated in terms of phase formation, pore size distribution modification and change in the dynamic elastic modulus. Then, treated and untreated limestone samples were subjected to an accelerated crystallization procedure in laboratory, to evaluate the benefits deriving from the treatments. }, key = {SWBSS 2021}, url = {https://predict.kikirpa.be/wp-content/uploads/2021/12/SWBSS2021_Procedings.pdf }, author = {Franzoni, E. and Sassoni, E. and Marrone, C.} } |
| DOI | |
| Link | |
| Bemerkungen | in: Lubelli, B.; Kamat, A.A.; Quist, W.J. (Hrsg.): Proceedings of SWBSS 2021 – Fifth International Conference on Salt Weathering of Buildings and Stone Sculptures,TU Delft Open 233-240 |
Eintrag in der Bibliographie
| [Franzoni.etal:2021] | Franzoni, E.; Sassoni, E.; Marrone, C. (2021): Development of hydroxyapatitechitosan-based treatments for the mitigation of salt damage in globigerina limestone . In: Lubelli, B.; Kamat, A.A.; Quist, W.J. (Hrsg.): Proceedings of SWBSS 2021 – Fifth International Conference on Salt Weathering of Buildings and Stone Sculptures,TU Delft Open 233-240, Webadresse. |  |
Keywords[Bearbeiten]
Salt crystallization test, biopolymers, chitosan, phosphatic consolidants, UPV
Abstract[Bearbeiten]
Many soft limestones used in heritage buildings in the Mediterranean area are affected by salt crystallization, leading to alveolization and dramatic stoneloss. To fight saltinduced deterioration of stone, different treatments were recently proposed, aimed at modifying the crystallization of salts during either the nucleation or growth of the crystals. In particular, strategies based on crystallization inhibitors and promoters were studied in the literature. In this paper, a new two-step treatment was applied to Globigerina limestone samples. The treatment consists in the application of an aqueous solution based on diammonium hydrogen phosphate, followed by the application of a chitosan solution. The first one produces aninorganic layer of calcium phosphate phases (mainly hydroxyapatite) and is aimed not only at consolidating the stone and preventing calcite dissolution, but also at providing a rough anchoring substrate for chitosan. The second layer is formed by chitosan, a biopolymer that was shown to have an inhibiting action on the crystallization of sodium sulphate.The two solutions were applied to the limestone samples both alone and combined, adopting different concentrations.The effects of the treatments were investigated in terms of phase formation, pore size distribution modification and change in the dynamic elastic modulus. Then, treated and untreated limestone samples were subjected to an accelerated crystallization procedure in laboratory, to evaluate the benefits deriving from the treatments.