基于大比尺模型试验的连续配筋混凝土路面开裂研究

A large-scale model, continuously reinforced concrete beam (CRCB), was built to analyze the sensitivity of the transverse crack properties for variations in concrete material, reinforcement ratio and the use of macro fibers and active crack control, in order to control the transverse cracks in continuously reinforced concrete pavement (CRCP). An analytical method to calculate crack spacing and width was established to quantify the impact of the parameters. Results show that the analytical results are consistent with the field measured results, indicating the feasibility of the proposed analytical model. Transverse cracks developed with time and became stable after approximately 19-month construction. Steel content has significant effect on transverse cracks with approximately 17% reduction in both crack spacing and width in the test beam using #7 bar with diameter of 22.23 mm, compared to the test beam with #6 bar of 19.05 mm diameter. Lightweight concrete has potential to reduce punchout since it produces higher crack spacing and smaller crack width. With fibers and active crack control, the test beam shows larger crack spacing and less crack width.