Get this from a library! Alkoxysilanes and the consolidation of stone. [George Wheeler; Getty Conservation Institute.]. Stone is one of the oldest building materials, and its conservation ranks as one of the most challenging in the field. The use of alkoxysilanes in the conservation. Permalink: ; Title: Alkoxysilanes and the consolidation of stone / George Wheeler ; with annotated bibliography by.
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Fassina, Stone Decav and Conservation: Proceedings of tiie Intemational Symposium, Bologna, June When choosing a solvent and catalyst to increase the rate of polymerization, one should be aware of the fact that aljoxysilanes must not react with the substrate and leave any soluble residue in it which can cause future decay.
The network polymer that first forms is a soft gel; the gel shrinks and fo harder; the shrinkage continues and it changes into a hard, brittie glass; in the end, it shrinks to small, glassy particles or crumbles to a fine powder.
Based on the fact that the structure of the material undergoes so little modification with ethyl silicate based treatment, Chiari suggests that reapplication of other consolidants can be considered, if needed. Would you also like to submit a review for this item? Related Publications Stone Conservation: History of the Use of Alkoxysilanes for Stone Consolidation 54 3.
Conservators should be aware of the fact that even this small difference in composition results in some changes in the physical properties of the resins.
Full text of “Alkoxysilanes consolidation of stone and earthen building materials”
For a complete and 43 reliable laboratory evaluation, samples should represent the variety of decay processes. Larger sized specimens, like test bars, are required by some test methods established by ASTM Standards. On the other hand inF. This is not practical on large building siufaces. Sinceethyl silicate has been applied to the consolidation of adobe with satisfactory results.
He argued that the vacuum method does not seem to encapsulate salts more than brush applied systems. Winkler has introduced thin discs for testing the durability and strength of stone. They recommended the use of fluorocarbon-acrylic mixtures for surface application rather than impregnation. Search WorldCat Find items in libraries near you. Getty Conservation Institute,p. Fassina, Stone Decay and Conservation: They both have been used for stone consolidation, even though their structure is fundamentally different.
InBrethane began being marketed by Colebrand Ltd. Spray application also limits their use, making them more suited to small objects or architectural details rather than large building surfaces. The synthesis of silicon tetrachloride, which was reported by J. Not only consolidant itself, but also the method of application has an influence on the effectiveness of a alkoxysilanws treatment. There are conflicting opinions alkoxysilahes conservators and scientists regarding the importance of the molecular bond in strengthening stone.
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It should not have deleterious chemical or physical interactions with the stone which can form harmful by-products such 27 as soluble salts. The consolidant should create no or minimal alteration in texture, color and reflectance of the stone either initially or after exposure to the environment If the treatment alters the natiual appearance of the stone, the conservator responsible for the preservation of the structure will have to evaluate its stkne.
What will be the effect of retreatment on the first treatment? In addition to the primary performance requirements, a specific application may necessitate secondary requirements, as well. A Long-Term Evaluation,” pp. One of the most important properties of alkoxysilanes is their ability to penetrate deeply into porous stone.
Alkoxysilanes and the consolidation of stone
Poor penetration is also among the disadvantages of synthetic organic polymers. The surface was impregnated with the mixture, first by spraying then by brushing total 5 applications to prevent the breaking away of raised crusts.
The University of Louisville,pp.