Operation of subgrades with application of polyurethane binder for its stabilization

Moscow State University of Civil Engineering (MGSU), National Research University, 129337, Yaroslavskoe shosse, 26, Moscow, Russia

^* Corresponding author: barabanova.tanya@mail.ru

Abstract

Slopes of road subbase and subgrade under operation are subjected to deformation and destruction while being affected by atmospheric precipitation, deicing agents and temperature drops. Stabilization of road slopes should proceed throughout the entire life cycle of the road. There arose a need to work out the most effective and durable design solution. Structures being under operation are exposed to external factors that cause washouts and defects of expansion joints. Washouts of geocell reinforcement structures may occur as well. Structural repairs sometimes are not effective, so destructions continue and progress. Analysis of the use of conventional technologies has shown that implementation of a polyurethane binder for stabilization of slopes is the most effective design solution under certain conditions. Binder based on polyurethane, when applied to rock material (crushed stone or gravel), forms a durable structure that is resistant to external influences and has high strength properties. A set of national standards for application of this technology is currently being developed. It is confirmed that the material under consideration meets the requirements of fire protection, sanitation and epidemiology, hygiene, and environmental safety. By these days, this technology has been implemented at more than 30 highway structures in the city of Moscow and in the Moscow and Smolensk Regions.