Calcium hydroxide nanosols for the consolidation of porous building materials - results from EU-STONECORE

Springer Science and Business Media LLC - Tập 1 - Trang 1-9 - 2013
Arnulf Daehne1, Christoph Herm2
1Schloss 17, Altenburg, Germany
2Hochschule fuer Bildende Kuenste Dresden, Dresden, Germany

Tóm tắt

The main idea of the European STONECORE R&D project (2008 to 2011) was to develop and evaluate nano materials for the use in refurbishment and conservation of historic monuments. A set of different calcium hydroxide (“lime”) nanoparticles dispersed in alcohols (CaLoSiL®) available on the market were tested. The general advantages attributed to alcoholic lime dispersions were: compatibility of the consolidant with the original building material, no limitation of penetration due to the particle size, and no mobilisation of soluble salts. The paper mainly reports the evaluation of lime nanosols for consolidation of lime mortar, gypsum stucco, and mural painting layers. In order to achieve a penetration behaviour which is adequate to the pore structure of the substrate, the composition of the nanosol as well as its application procedure had to be adjusted. This could be achieved by dilution, additives, or after-treatment of the surface. Apart from structural strengthening of porous structures the lime nanosols were tested for treatment of larger defects such as fissures, cracks, detachment, and delamination. For this purpose the nanosols were modified with additives, fillers, and aggregate. The developed lime nanosol formulations were applied to test sites at three historic monuments with promising results. A ‘modular system’ was developed to meet all these conservation needs. These materials showed sufficient adhesive strength. They proved applicable for the consolidation of severely cracked limestone as well.

Tài liệu tham khảo

“Stone Conservation for Refurbishment of Buildings”, granted by the European Commission in the Seventh Framework Programme (01.09.2008 to 31.8.2011). Grant agreement No. 213651, See: http://www.stonecore-europe.eu (31.07.2010)

Giorgi R, Dei L, Baglioni P: A new method for consolidating wall paintings based on dispersions of lime in alcohol. Stud Conserv. 2000, 45: 154-161. 10.2307/1506761.

Nanorestore®, from: CTS Srl: Altavilla Vicentina/Italy, See: http://www.ctseurope.com (31.07.2012)

CaLoSiL®, from: IBZ Salzchemie: Freiberg/Germany, See http://www.ibz-freiberg.de (31.07.2012)

Drdácký M, Slížková Z, Ziegenbalg G: Α nano approach to consolidation of degraded historic lime mortars. J Nano Res. 2009, 8: 13-22.

Ziegenbalg G: Colloidal calcium hydroxide – a new material for consolidation and conservation of carbonatic stones. Proceedings of the 11th international congress on deterioration and conservation of stone, 15-20 September 2008. Edited by: Lukaszewicz E, Niemcewicz P. 2008, Torun, Poland: Torun, Uniwersitet Mikolaja Kopernika, 1109-1115.

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Dähne A: The results are presented in more detail in: Die Anwendung alkoholischer Calciumhydroxid-Nanodispersionen und Calciumsulfat-Dispersionen für die Konservierung von Putz, Stuck und Malschichten, Dissertation Hochschule für Bildende Künste Dresden. 2012, delivered 15.09.2012

CaloXil Injection Grout®, from: IBZ Salzchemie. Freiberg/Germany, See http://www.ibz-freiberg.de (04.04.2013)

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