72: Conservation of a recent conservation based ethyl-silicate (Conservation Insights 2020) скачать в хорошем качестве

72: Conservation of a recent conservation based ethyl-silicate (Conservation Insights 2020)

INTACH Conservation Institute Lecture Series 'Conservation Insights 2020’ was delivered on 4th December at 1700 IST via Zoom Speaker: Albert Kieferle (Conservator, AeDis AG, Germany) The title of the talk: Conservation of a recent conservation based on ethyl-silicate and colloidal silica The minster of Salem-Abbey in southern Germany, built of various types of molasse sandstone, underwent a conservation based on a consolidation with ethyl-silicate and injections, edging repairs and slurries with a colloidal silica binding in 1997 to 2002. These works had originally not been planned during the restoration phase 1997-2002, so work was only done partially, meaning a minor set of conservation measures. In 2009 we had a chance to take a closer look at the façade of the minster, where we had found no change since 1997. In 2014, while planning the previously omitted steps, this had changed. Gaps that had been closed 15 years earlier had reopened and new hairline cracks had appeared. Some scientific examinations on aged ethyl-silicate treated sandstone were launched, especially in relation to hygric properties (large hygric dilation). The new gaps were too narrow and were therefore filled with ‘silicate-stone-glue’ (Steinsilikatkleber) having a far better viscosity. This material having ethyl-silicate as one of its components could be applied in a combination with a consolidation using ethyl-silicate. It ended being a careful retreatment with ethyl-silicate in a situation, where ethyl-silicate had already been applied. #ConservationInsights2020 #StoneConservation #StoneConsolidant