Improvement of Reinforcement Effect of Alkoxy Silanes for Conservation of Stone Cultural Assets

Abstract

Improvement of reinforcement effect of alkoxy silanes for conservation of stone cultural assets was investigated. The effect of oligomers of methyltrimethoxysilane with three different molecular weights was compared with the commercial stone reinforcement agent（ OM50, Wacker Chemie AG., Germany）. The compressive strength of solidified model sand with oligomer and an organotin catalyst was higher than that with the commercial stone reinforcement agent of OM50 and it was more significant with the increase of molecular weight. The addition of oligomer to OM50 was also effective. However, the permeability of oligomer to the model sand decreased with the increase of molecular weight. The fracture behavior of the oligomer added system was brittle. The compression test for the solidified model sand with 3-methacryloxypropylmethy ldimethoxysilane and an organotin catalyst showed the ductile fracture. It was found that the fracture behavior is dependent on the chemical structure of alkoxy silane.