Experimental Investigation On The Effect Of Temperature And Strain Rate On Dynamic Properties Of Ballast Bonding

With the development of high-speed railway, stability problems of track bed become increasingly prominent, an effective method is using Ballast Bonding to reinforcement of the track bed. Ballast Bonding is one or more cementitious material (such as polyol, isocyanate, etc.) combined composite environmental materials. It has good resistance to ultraviolet light, acid, alkali, oil,weather, freeze-thaw and frost. Split Hopkinson Pressure Bar (SHPB) technology is the most effective means of measuring the dynamic mechanical properties of materials. Based on the traditional SHPB technique, pulse sharping technique, quartz crystal, semiconductor strain gauge technology, long rod system are used for ballast bonding dynamic mechanical strain at different rates and different temperatures study on performance.To study strain rate effect on ballast bonding, we get this material from 10-3 s-1～4×10-s-1 stress-strain curve. Results show that the Ballast Bongding has significant strain rate effect, the yield stress and logarithmic strain rate showed a bilinear relationship.To study temperature effect on ballast bonding, we built a high and low temperature heating and cooling devices SHPB experiment, described the use of the experimental apparatus and method steps of high and low temperature experiments. Using this experimental techniques to test ballast bonding under different loading conditions of temperature stress-strain curve. Experimental results show that the effect of the softening temperature of the material is obvious.Researched on the Ballast Bonding constitutive equations, based on modified Zhu Wang Tang (ZWT) model parameters were fitted model curve obtained can well estimate the experiment results show that the constitutive equation can describe Ballast Bonding’s dynamic response.