Study on non-destructive reinforcing material of modified one component polyurethane for tunnel crack disease prevention

In view of the defects of tunnel lining structure such as cracking and block dropping, cavity behind, honeycomb and pitted surface, construction joint dislocation and other defects, the technical research direction for non-destructive reinforcement materials in tunnel is proposed. The polyamide curing coating agent and one-component polyurethane protective material with high adhesion, good elongation, large tensile strength and rapid drying are developed. The above materials are described The application technology and key points of brush coating, rolling coating and scraping coating can provide reference for related engineering application.