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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The presence of solvents has an essential influence on the speed of the cross-linking reaction which should take place slowly to gain time dtone the diffusion of the resin molecules into the pores of stone.
One of the mixtures tested was Raccanello E. There is no doubt that alkoxysilanes have extended the life of decaying stonework in many cases.
In addition, problems can be faced regarding the total penetration of most stone consolidants when large sized test samples required by some ASTM standard test methods are used. Several applications of ethyl sihcate were performed by spraying to consoUdate the mudbrick support of the painting even before attempting to clean the surface.
Alkoxysilanes and the consolidation of stone
After 10 years of evaluation, previous test results were confirmed and the overall conservation began in Safety glasses should be worn at all times for eye protection. The deposition, that will bind stone particles together, can result from evaporation of the solvent or chemical reactions with the stone. In addition to the primary performance requirements, a specific application may necessitate secondary requirements, as well.
As consolidants, alkoxysilanes, especially ethyl silicate, have found a wide acceptance in present conservation practice.
Some of the historic structures treated with alkoxysilanes are Bamberg CathedralCologne Cathedraland the Alte Pinakothek in Munich Citations are based on reference standards. Government Piintine Office, Often, fibrous organic materials, such as straw and animal hair are added to reduce the cracking when the adobe dries.
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Retreatment is also claimed to be possible with this consolidant. Therefore, waxes can be considered as protective coatings rather than impregnants. However, it is not yet known whether or not comsolidation shrinking can generate stress in the material in the long- term. They also reported that even the order of mixing one in another gives a different set of reaction products.
Synthetic resins can be divided into two main groups which are thermoplastic and thermosetting resins.
Centro per la Conservazione delle Sculture all’Apeno,pp. There are basic performance requirements that all consolidants must fulfill regardless of the specific application. Linked Data More info about Slkoxysilanes Data. During the application of alkoxysilane consolidants, adequate precautions should be taken to avoid contact with skin and eyes.
Deterioration of this particular mudbrick was due to ground water infiltration, temperature fluctuation between day and night and wind abrasion. This would also allow the treated stone to absorb a further treatment when necessary.
Alkoxysilanes and the consolidation of stone – Ghent University Library
The on-site test area should be representative of the more severely weathered areas and its condition before treatment should be carefully recorded. Torraca, Porous Bu ilding Materials: The methoxy groups are hydrolyzed to form a silanol, and methanol alkoxyilanes liberated: Well-documented, detailed descriptions of the treatments and records of subsequent inspections including regular monitoring of the consolidated area should become part of the conservation program.
Catalysts are often employed to speed up the rate of hydrolysis and condensation reactions so that the evaporation of the monomer before polymerization is avoided. Giorgio Torraca reported in that the penetration of the partially polymerized ethyl ocnsolidation [Silester Alkoxhsilanes Monsanto ] was poor mm. The Conservation of Wooden Cultural property. Riederer claimed that in the case of porous stones, ethyl silicate has 56 proved to be superior to all other stone consolidants.
Torraca, Porous Building Materials: On the other hand, ethyl silicate treatment seemed to be sufficient to provide the necessary water resistance in Hatra where the water table was much lower. There are conflicting opinions among conservators and scientists regarding the importance of the molecular alkoxysialnes in strengthening stone. According to Helmut Weber, repeat application after one or two weeks is an effective method of consolidation treatment, as well as continuous spray applications.
Alkoxysilanes and the consolidation of stone (Book, ) 
Consolidationn User-contributed reviews Add a review and share your thoughts with other readers. It has been suggested that air and surface temperatures should be from 50 degrees F to 85 degrees F during application. Therefore, in contrast to brittie paraffin waxes, microcrystalline waxes have good plasticity and adhesion. Recent improvements in consolidating the mediaeval figure sculptures of Wells Cathedral, England, with lime poultices and limewater have attracted new attention to limewater as a stone consolidanL Cosolidation the early ‘s, Prof.
It was ref orted by Taylor that preservation techniques employed on these test walls showed a varied range of erosional patterns syone 69 three and a half years of exposure. Siliceous Consolidants 4 1. The chemical substances were either sprayed on the wall surface, applied with a paint roller, or mixed in with the mud plaster. Building Research Establishment,p. King in claimed the use of fungicides, insecticides, germicides, antiseptic or other substances with silicic esters mainly for masonry preservation.
Thermoplastics are composed of monomeric units, which are linked together by weak molecular forces to form two-dimentional linear chains. The consolidation treatment may not be reversible, but may be retreatable so that 28 the future application of the same treatment or another treatment may be possible as it tthe needed. Fassina, Stone Dec av and Conservation: However, the idea of using ethyl alkoxysilanws for conservation of stone is not new; it dates back to Search WorldCat Find items in libraries near you.