Analysis On Influence Of Micro-encapsulated Phase Change Thermoregulation Agent On Temperature Field Of Asphalt Pavement

Environmental temperature has significant influence on the viscous-elastic-plasticity characteristics of asphalt mixture, which will cause asphalt pavement deformation under high temperature and traffic load, and crack under low temperature. Analysis of asphalt pavement structures and design of pavement materials can be better achieved by accurately analyzing asphalt pavement temperature field under environmental conditions. Former research prepared Micro-Encapsulated Phase Change Thermoregulation Agent(MEPCTA) that can regulate asphalt pavement temperature and improve asphalt pavement resistance to adverse temperature change. However, no research has been conducted on the influence of MEPCTA on asphalt pavement temperature field.This paper built a finite element model corresponding to the existed outdoor asphalt mixture model which was built by former researcher, accuracy of the built model, pavement parameters and boundary conditions were validated by comparing the calculated temperature and measured one, and temperature distributions of outdoor asphalt mixture model constructed with and without MEPCTA were analyzed. A 2-D finite element model of asphalt pavement was also built to study temperature field difference between asphalt pavements constructed with and without MEPCTA under different conditions. The results show: temperature distributions inside outdoor asphalt mixture model varied similarly to environmental temperature and also were later that environmental temperature; the built finite element model had good accuracy, which showed that pavement parameters and boundary conditions were well considered; temperature difference between asphalt pavement constructed with and without MEPCTA were observed when different dosages of MEPCTA were mixed into upper and full surface layer of asphalt pavement; the larger dosage of MEPCTA led to larger latent heat accumulated temperature value, which means stronger influence of MEPCTA on asphalt pavement temperature; thermoregulation efficiency of MEPCTA was determined by its dosage, location and the variation of environmental conditions.