A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance
Sodium sulfate is one of the most damaging and complex salts typically involved in the deterioration of our architectural heritage. One of the main difficulties is to determine which of its crystalline phases, that is, thenardite, mirabilite, or the metastable heptahydrate, will precipitate under certain conditions. Indeed, there is a significant range of temperature and relative humidity in which these phases can crystallize. Furthermore, one precipitated crystalline phase may under certain conditions transform to another one. Here, we show that nuclear magnetic resonance can be successfully used to nondestructively define the phase being precipitated. We investigate delamination of Ançã limestone due to sodium sulfate crystallization, a type of decay which is representative of those occurring in real constructions. The decay was achieved during isothermal drying of stone specimens under different environmental conditions. The work allowed concluding that both mirabilite and heptahydrate can be responsible for this type of decay in different conditions. The heptahydrate tends to crystallize when there is no previous presence of mirabilite crystals in the porous material. ; This work was supported by national funds, under the research project DRYMASS (ref. PTDC/ECM/100553/2008), through the Portuguese Fundação para a Ciência e a Tecnologia (FCT) and the Laboratório Nacional de Engenharia Civil (LNEC). ; 9 ; 3 ; 19 ; This work was performed at the Department of Applied Physics of Eindhoven University of Technology (The Netherlands). We thank the help of Jinping Han, Sonia Gupta, and Pim Donkers for their assistance with the NMR setup. We would also like to acknowledge the contributions of José Costa and José Delgado Rodrigues. ; http://jen.sagepub.com/content/early/2014/07/29/1744259114543981 ; DM/NBPC ; Journal of Building Physics
Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance
Sodium sulfate is one of the most damaging and complex salts typically involved in the deterioration of our architectural heritage. One of the main difficulties is to determine which of its crystalline phases, that is, thenardite, mirabilite, or the metastable heptahydrate, will precipitate under certain conditions. Indeed, there is a significant range of temperature and relative humidity in which these phases can crystallize. Furthermore, one precipitated crystalline phase may under certain conditions transform to another one. Here, we show that nuclear magnetic resonance can be successfully used to nondestructively define the phase being precipitated. We investigate delamination of Ançã limestone due to sodium sulfate crystallization, a type of decay which is representative of those occurring in real constructions. The decay was achieved during isothermal drying of stone specimens under different environmental conditions. The work allowed concluding that both mirabilite and heptahydrate can be responsible for this type of decay in different conditions. The heptahydrate tends to crystallize when there is no previous presence of mirabilite crystals in the porous material. ; This work was supported by national funds, under the research project DRYMASS (ref. PTDC/ECM/100553/2008), through the Portuguese Fundação para a Ciência e a Tecnologia (FCT) and the Laboratório Nacional de Engenharia Civil (LNEC). ; 9 ; 3 ; 19 ; This work was performed at the Department of Applied Physics of Eindhoven University of Technology (The Netherlands). We thank the help of Jinping Han, Sonia Gupta, and Pim Donkers for their assistance with the NMR setup. We would also like to acknowledge the contributions of José Costa and José Delgado Rodrigues. ; http://jen.sagepub.com/content/early/2014/07/29/1744259114543981 ; DM/NBPC ; Journal of Building Physics
Delamination of Ançã limestone due to sodium sulfate under different environmental conditions as studied by nuclear magnetic resonance
Brito, V. (author) / Saidov , T. (author) / Gonçalves, T. D. (author) / Pel, L. (author)
2014-07-31
0202/111/17398
Article (Journal)
Electronic Resource
English
DDC:
500
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