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 chemical substances were either sprayed on the wall surface, applied with a paint roller, or mixed in with the mud plaster. Horie, Materials for Conservation, p. The method was said to be under patent in most European countries.
Price, ” Brethane Stone Preservative,” p. Therefore, the consolidant should not be applied during rain or when there consopidation chance of rain within 24 hours after application. Masonry samples treated with the selected consolidant s are then analyzed to determine the performance of the treatment.
Methyl methacrylate and butyl methacrylate are the acrylic cnsolidation that have been most widely used to consolidate stone and concrete. Create lists, bibliographies and reviews: Find more information about: If so, a retreatment with ethyl silicate to regain the required degree of alkoxysilanfs might be a possibility, but only if the material has regained its original porosity.
The repair work may include pinning, mortar filling, fracture grouting, repointing, adhering detached pieces, and application of biocides, etc. Alkoxysilanes and the consolidation of stone.
Building Research Establishment,pp. You may send this item to up to five recipients.
Application by hand operated spray is very convenient and least damaging to friable surfaces, whereas application by brush is suitable on very firm surfaces. However, the treatment with barium hydroxide also somewhat transforms soluble calcium sulfate, which is present in the stone after years of attack by atmospheric sulfur oxides, to much less soluble barium sulfate.
Alkoxysilanes and the Consolidation of Stone
As a result of extensive practical experience at the British Museum, S. The use of inorganic materials as consolidants is an effort to produce a decay- resistant phase in the pores of deteriorated stone from aqueous solutions.
Several types of stone, brick and clay have reactive hydroxyl groups on their surface. Interim Report, ” Studies in Conservation 21, 4 ,pp.
It has been used for centuries to treat limestone. Berzelius instimulated the synthesis of organosilicon compounds, among them tetraethoxysilane and triethoxymethylsilane.
Alkoxysilanes and the consolidation of stone
Epoxy resins improve the mechanical properties of stone after correct hardening. Hydrated silicon oxides, which is the combination of silica and water, form salts called silicates, such as sodium silicate and potassium silicate. Synthetic resins can be divided into two main groups which are thermoplastic and thermosetting resins.
Koch mentioned silicic acid esters as effective agents for stone consolidation as a result of extensive experimentation with different stone protection agents. The percent alkoxysilaness of chloride, sulfate and nitrate salts present in each masonry sample are determined.
Once the above testing procedures have been completed, evaluation of the laboratory data in conjunction with the survey of existing conditions of the masonry can assist in identifying the causes of decay, the suitability of the substrate for consolidation and finally in selecting the appropriate consolidant s for the masonry conditions present at the job site. In the initial stages, applications are absorbed very rapidly.
German literature contains numerous enthusiastic reports about the successful application of silicic acid based products to consolidate deteriorated German sandstones. Rome, October, The synthesis of silicon tetrachloride, which was alkoxysianes by J. GeneraUy, the deterioration of adobe alkoxysilanex is attributable to excessive moisture, either rainwater or ground water.
It is the alkyl groups that present a non-polar aspect to the surroundings and therefore provide water repellency in addition to the consolidating effect of the alkyl trialkoxy silanes.
The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. Waxes may cause yellowing of the treated surfaces.
If the consolidant is toxic, volatile, flammable, etc. The Conservation of Wooden Cultural Property.
Alkoxysilanes and the consolidation of stone – Ghent University Library
Home About Help Search. Adobe, by its composition, is less durable than stone and obviously more susceptible to weathering. The choice thw solvent to be used with epoxides is also very important.