Methodological evaluation of some consolidants interference with ancient Egyptian sandstone “Edfu Mammisi as a case study”

The present paper deals with the study of stone consolidants based on ethyl silicates. It is the 2nd part of a study on Edfu birth house investigating the deterioration phenomena, which affected its building materials along with the ideal methods and materials that should be used for conserving, restoring and strengthening its stone surfaces. Some tests were performed for studying the behavior of 4 consolidants based on ethyl silicates; Tegovakon V, Rhodorsil RC 80, Rhodorsil RC 70 and Eliosil W119. The main goal of these tests was to estimate the consolidants efficiency and investigate the changes of chemical characteristics and physio-mechanical properties of stone samples collected from our site before and after consolidation, and after artificial aging. For realizing this target, laboratories measurements such as weight change, depth of penetration, chromatic variations, physio-mechanical and SEM were performed. It was observed that there are noticeable differences among stone physio-mechanical properties according to the types of consolidant. It is found that, on one hand the first three materials (Tegovakon V, RC 80 and RC 70) play an important role as effective consolidant materials, on the other hand the forth one should be set aside due to its negative effects resulted by the chemical reaction between the components of this consolidant with the stone cement materials (iron oxide).