Comparative Study on Crack and Factor of Continuously Reinforced Concrete Pavement in the Tunnel and Outside

AbstractPunchout is the main destruction of continuously reinforced concrete pavement, which is closely related to concrete cracking, the form and distribution pattern of pavement crack. Temperature and humidity are important impact factors of concrete pavement cracking. Base on the analysis of temperature and humidity inside and outside the tunnel, this paper studies the influence of temperature and humidity on the continuously reinforced concrete pavement cracking conditions of the test-road, and the application of continuously reinforced concrete pavement in the tunnel and outside by investigating the crack development. It is found that the daily temperature difference is 2°C in the tunnel, the annual temperature difference and humidity are 8.9°C and 75 ∼ 85%, respectively. Temperature during the construction and curing temperature and humidity of continuously reinforced concrete pavement is of great influence on the crack occurrence. Cracks outside the tunnel occur more and are with concentrated distribution in the early stage. Crack distribution in the tunnel is more reasonable. After eight months including a winter, the crack number increased significantly outside, while the spacing was wider and the width was smaller in the tunnel. Results show that appropriate temperature and humidity can guarantee a cement road application, continuously reinforced concrete pavement crack form is more reasonable, performance in the crack width is small, the spacing is big, which reduces the possibility of punchout and spalling