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Elaich module 5 topic 5.1.1

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ELAICH - Educational Linkage Approach in Cultural Heritage. …

ELAICH - Educational Linkage Approach in Cultural Heritage.
For more information and presentations, please visit: http://elaich.technion.ac.il/

How to monitor cultural heritage after the conservation treatments

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  • 1. Educational Linkage Approach In Cultural HeritageEducational ToolkitTeaching MaterialBasic CourseModule 5 Monitoring and maintenance How to monitor cultural heritage after the conservationTopic 5.1.1 treatmentsProf. Guido Biscontin & Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 2. Educational Linkage Approach In Cultural Heritage Copyright ©ELAICH Beneficiaries 2009-2012 This material is an integral part of the “ELAICH – educational toolkit” and developed as part of the project ELAICH – Educational Linkage Approach in Cultural Heritage within the framework of EuroMed Cultural Heritage 4 Programme under grant agreement ENPI 150583. All rights reserved to the ELAICH Beneficiaries. This material, in its entirety only, may be used in "fair use" only as part of the ELAICH – educational toolkit for the educational purposes by non-profit educational establishments or in self-education, clearly indicating “©ELAICH Beneficiaries 2009-2011” and making reference to these terms. Use of parts of the material is strictly forbidden. No part of this material may be: (1) used other than intended (2) copied, reproduced or distributed in any physical or electronic form (3) reproduced in any publication of any kind (4) used as part of any other teaching material in any framework; unless prior written permission of the ELAICH Beneficiaries has been obtained. Disclaimer This document has been produced with the financial assistance of the European Union. The contents of this document are the sole responsibility of the ELAICH Consortium and can under no circumstances be regarded as reflecting the position of the European Union.Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 3. Educational Linkage Approach In Cultural HeritageAbstract The topic 5.1 introduces you to the concept of Monitoring as a fundamental part of a conservation project. Monitoring means to evaluate a series of parameters which can describe the state of conservation of the artifacts. Of course, this evaluation has to be done on restored artifacts as well, since it allows to control the efficiency of the intervention over time. From the theory to the practice?! It is necessary to know the behaviours of different materials, to set the specific environmental conditions and to project a Monitoring Plan over time. As a matter of fact, some processes are very quick (for example the deposition of dust on the surfaces), some others are slower (such as the chemical transformations due to acid rains). In this context, it is crucial to define and select suitable parameters and easy methods for monitoring over time not only the artifacts but also the stability and efficiency of the products used during the conservation process. Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 4. Educational Linkage Approach In Cultural Heritage Monitoring means… In laboratory Control of parameters by...to perform evaluation tests objective analysis reference indexeson conservation products and application of specifictreatments In situ measurement protocols Selection of the best conservative treatments considering: aesthetic and material compatibility with the system, sustainability, low environmental impact, low toxicity, etc. Determination of the most relevant indexes for the correct evaluation of the use of innovative methodologies or new products (meaningful, objective, measurable and repeatable parameters) MONITORING as a PROGRAMMED ACTION Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 5. Educational Linkage Approach In Cultural Heritage Monitoring means… evaluation tests on conservation products and treatments in laboratoryBiblioteca Marciana, S.Mark’s square, VeniceAnalysis of superficialarchitectural layersPatina with siliciumand calcium oxalate Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 6. Educational Linkage Approach In Cultural HeritageMonitoring means… evaluation tests on conservation products and treatments in situ Application of differnt products Select the best one Check the stability,compatibility of theproducts over time Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 7. Educational Linkage Approach In Cultural HeritageWe can monitor different parameters, for example… Material Parameters Aesthetical Parameters -Superficial micro-morphology -Colour -Water repellence/affinity -Substituted material -Content of soluble salts -Re-integration (pictorial, plastered- Material cohesion and adhesion areas) -Material resistance to climatic -etc. changes -etc Let’s see together some of them! Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 8. Educational Linkage Approach In Cultural HeritageMONITORING: EVALUATION OF CONSERVATION PRODUCTS Products used in conservation should have specific characteristics: EVALUATION OF -Compatibility CONSERVATION -Reversibility PRODUCTS - Water repellence - permeability -Stability -Low toxicity -Transparency - Low colour changes Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 9. Educational Linkage Approach In Cultural Heritage PRODUCTS CHARACTERISTICS the products can be removed from the substrate without COMPATIBILITY damaging it Formation of a two- component system (substrate- REVERSIBILITY products), in which the physical, chemical,mechanical and aesthetical properties of the products don’t inerfere with the substrateProf. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 10. Educational Linkage Approach In Cultural Heritage Compatibility or not? Figura 1 particolare della zona A sulla Trachite Euganea prima Figura 2 particolare della zona A sulla Trachite Euganea dopo la dell’intervento rimozione dell’impasto epossidico Figura 3 particolare della zona A a seguito dell’impacco Figura 4 dopo la rimozione dell’impacco l’area viene pulita estrattivo – si nota il rigonfiamento e l’indebolimento della resina tramite lavaggio con vapore e blanda azione meccanica con la successiva scagliaturaProf. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 11. Educational Linkage Approach In Cultural HeritagePRODUCTS CHARACTERISTICS WATER REPELLENCE Water is not able to wet the product Water enters in contact with IMPERMEABILITY the product-surface but doesn’t penetrate into it Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 12. Educational Linkage Approach In Cultural HeritageCONTACT ANGLE MEASUREMENTS: EVALUATION OF WATER REPELLENCE/WATER AFFINITY OF STONE SAMPLES Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 13. Educational Linkage Approach In Cultural HeritageCONTACT ANGLE MEASUREMENTS: EVALUATION OF WATER REPELLENCE/WATER AFFINITY OF STONE SAMPLES Angle <90° = wettability 35° 135° 105° Angle >90° = water repellence Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 14. Educational Linkage Approach In Cultural Heritage Water repellence or affinity? Water droplets on Istrian StoneWater droplets ontextile Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 15. Educational Linkage Approach In Cultural Heritage MEASUREMENT OF WATER ABSORPTION raw stone material (no treatments) 0,010 0,008Absorbed water (ml/cm2) 0,006 0,004 0,002 0,000 0 5 10 15 20 25 30 35 Time (minutes) Stone treated with a water-repellent product less water absorbedProf. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 16. Educational Linkage Approach In Cultural Heritage MEASUREMENT OF WATER ABSORPTION ! a nd water! e o s “M onitoring k of the vid Have a loo Non treated material 0,003Absorbed Treated materialwater(ml/cm2) 0,002 Treated and ageing material 0,001 Water Product is 0 0 5 10 15 20 absorption deteriorated Time (min) Time for a maintenance intervention!! Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 17. Educational Linkage Approach In Cultural HeritagePRODUCTS CHARACTERISTICS TOXICITY The product maintain its characterists over time althought subjected to deterioration agents (environment, use, ..) Products are dangerous for the operators’ health for and STABILITY environment Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 18. Educational Linkage Approach In Cultural HeritagePRODUCTS CHARACTERISTICS ? ? TRANSPARENCY Are these characteristics only linked to aesthetic isues? COLOUR ? ? Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 19. Educational Linkage Approach In Cultural Heritage EVALUATION OF COLOUR CIELAB system: •L * defines the brightness and indicates the value between white and black •a * indicates the value between red and green: a * positive values appear reddish, negative a * values greenish. •b * indicates the value betweenColor representation using three- yellow and blue: positive b * valuesdimensional space appear yellowish, negative b *(coordinates of tristimulus) values bluish.LET’S SEE HOW TO MEASURE AND MONITOR COLOURS IN CULTURALHETITAGE: LOOK AT THE VIDEO “Monitoring the colour” Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 20. Educational Linkage Approach In Cultural Heritage EVALUATION OF COLOUR 100 16 b* 14 L* 90 12 10 80 8 70 6 4 60 2 a* 0 50-10 -8 -6 -4 -2 -2 0 2 4 6 8 10 -4 40 -6 30 -8 -10 20 -12 TAL QUALE (b) (c) (d) (e) -14 10 -16 0 Graphical representation of chromaticity coordinates in space CIE L * a * b * Prof. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice
  • 21. Educational Linkage Approach In Cultural Heritage This presentation was done with the collaboration between Ca’ Foscari University of Venice: Prof. Guido Biscontin, Prof. Elisabetta Zendri, M.Sc. Eleonora Balliana and Dr. Francesca Caterina Izzo Arcadia Ricerche Srl-Venice: Prof. Guido Driussi, M.Sc. Zeno MorabitoProf. Guido Biscontin&Dr.Francesca Caterina Izzo - University Ca’ Foscari of Venice