Teachers and Employees

Weber, Johannes ao. Univ.-Prof. Dr.phil.

title
VISUALISATION OF SOLID CONSOLIDANTS IN PORE SPACE OF POROUS LIMESTONE
type
speech
keywords
Conservation and Restoration, Electron microscopy, Materials physics
texts
description
VISUALISATION OF SOLID CONSOLIDANTS IN PORE SPACE OF POROUS LIMESTONE USING MICROSCOPIC METHODS The consolidation of porous limestone using ethyl silicate has a long-term practice in the field of conservation. In the present study, a Neogene porous limestone from Hungary was selected, consolidated with ethyl silicate by use of a vacuum-circulation (VAC) method. Drilling core samples taken from the test blocks were investigated by different microscopic methods, such as polarising microscopy, cathodoluminescence microscopy, and scanning electron microscopy. Based on the observations it can be stated that especially the cathodoluminescence and scanning electron microscopy are eligible for an exact and unambiguous 2 and 3 dimensional visualisation of the amorphous solid consolidant in the pore space of the stone. Results have shown that the distribution of large gel fragments with shrinkage cracks is very irregular and mostly limited to the sub-surface zones although traces of the consolidant could be detected for the whole thickness of the test blocks, i.e. down to a depth of 10 cm. In addition to those large aggregates of silica, thin gel films up to 5 m covering the pore walls were found in all samples.
Lecturers
Johannes Weber
title of event
STONE 2008 - 11th Internat. Congress on Deterioration and Conservation of Stone
contributors
F. Pintér
contribution
B. Bajnóczi
contribution
date, time and location
date
2008-09-15 – 2008-09-20
location
Torun (Polen)