Preparation and Mechanical Properties of Polyurethane Material for Railway Ballast

Abstract

ABSTRACTThe elastic solidification of track bed is a new track structure improvement technology between the traditional gravel track bed and the ballast less track monolithic track bed. It can effectively solve the main technical problems of heavy haul railway transportation, such as large impact force of wheel rail, serious deformation of track bed and frequent maintenance etc. In this paper, combined with the characteristics of polyurethane properties affected by its chemical composition, a solidified ballast polyurethane material suitable for heavy haul railway was developed by adding diluents and other materials. Physical property test and mechanical triaxial test were carried out to assess the influence of diluent content on the hardening effect of ballast; the physical process and mechanical properties of different proportion materials were analyzed. The experimental results show that adding appropriate amount of diluent into polyurethane material can effectively improve the integrity of ballast bed, increase the strength, reduce the deformation, and prolong the service life of ballast track bed.