Compositions for Limestone Restoration

Abstract

Information about the lime composition used for the restoration of limestone is given. To develop a repair composition, a polysilicate solution was used. It has been established that polysilicate solutions contain a monomer, oligomer and polymeric varieties of silica. It was found by the molybdate method that the content of the polymeric form of silica γ-SiO2 in the polysilicate solution is 15–19.93%, depending on the content of the silica sol. This composition of the polysilicate solution contributes to the manifestation of the high reactivity of silica. The technology for carrying out restoration work involves the application of a primer layer - liquid glass, followed by the application of a calcium chloride solution. After 20-30 minutes after applying the primer, it is possible to apply the repair composition with a spatula. It is shown that the use of a polysilicate solution in the formulation of a lime composition helps to increase the water resistance, adhesion strength of the composition to the base, and accelerates curing.