Volumetric mix-design modification and vibration attenuation analysis of rubberised epoxy asphalt track for railway
Chenguang Shi (Southeast University, RWTH Aachen University, Chongqing Jiaotong University)
You Wu (TU Delft - Railway Engineering)
Raul Fuentes (RWTH Aachen University)
Yulou Fan (Southeast University)
Yixin Zhou (Southeast University)
Chaoliang Fu (RWTH Aachen University)
Jun Yang (Southeast University)
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Abstract
Rubberized asphalt mixture effectively reduces vibrations in railway track due to the elasticity of crumb rubber (CR) and the viscoelasticity of asphalt binder. This study aims to design a rubberized epoxy asphalt mixture using the modified volumetric mix-design method named the multi-point supported skeleton for asphalt mixtures (V-S method). The feasibility and vibration attenuation of the precast epoxy asphalt track was evaluated through a 3D FEM simulation at a 350 km/h speed. By combining the V-S method with the equivalent volume replacement principle between CR and coarse aggregate, four types of rubberized epoxy asphalt mixtures were proposed using the dry method. Indoor test results confirm that these mixtures meet the required specifications. The FEM results demonstrate that the designed epoxy asphalt track meets the design criteria and the components of the EA-4CR track structure demonstrate superior vibration reduction performance among the cases with the same increment in CR content.