Real Scale Cyclic Loading Test of Asphalt Concrete Track with Cant

초록

Ballasted track is premised on the regular maintenance for plastic deformation or mud pumping. Manpower and time, however, is lacking for the maintenance due to low birthrate and aging society. To solve this shortcomings, ballastless track has been introduced worldwide since 1960s, where concrete or asphalt concrete tracks works as a trackbed. The track system has been adopted for tunnels or metros, and recently for Gyungbu 2nd and Honam high-speed rails in Korea. Asphalt concrete track is a new track system that combines the advantage of both ballasted and concrete tracks, and reduces the disadvantage of high maintenance cost of ballasted track and the high construction cost of concrete track. The system gives rapid maintenance, environment-friendliness and easy construction, but its mechanical properties are highly influenced by temperature and loading time. This paper performs real-sized train-loading test to estimate the safety of the asphalt concrete track under the high temperature of 40℃ and the maximum cant of 180 mm by analyzing the normal stress on the top of reinforced roadbed and the tensile strain of the lower surface of asphalt concrete.