No abstract

No abstract

Abstract

In order to study the slope stability of an impervious layer asphalt concrete panel, in this study, the maximum aggregate size used was 19 mm, and a slope flow value test was carried out after changing the gradation index, filler content and bitumen aggregate ratio. The test results showed that the relationship curve between the slope flow value and the test time was mainly divided into three stages for the slope flow value: an almost linear growth stage, a gradual stabilization stage, and a stable stage. The grading index, bitumen aggregate ratio and filler content had an effect on the slope flow value of asphalt concrete. The slope flow value decreased with the increase in the grading index. A reasonable increase in the grading index can increase the slope stability of the asphalt concrete panel. The slope flow value increased with the increase in the filler content and bitumen aggregate ratio. When the filler content exceeded 13%, the slope flow value significantly increased. At the same time, it was also verified that the asphalt concrete slope with the maximum aggregate size of 19 mm had good thermal stability. On this basis, a prediction model of asphalt concrete slope flow value and test time was established. The model considered the effect of different parameters of mix proportion on the slope flow value. The calculation results were in good agreement with the test results.

The nitrogen−fluorine-codoped reduced GO film (N, F-rGO film) is prepared by a simple one-step pyrolysis process. The as-prepared N, F-rGO film displays a loose porous structure between layers, and the N-and F-doping contents of the resulting N, F-rGO film were 4 and 1.3%, respectively. As a negative electrode for lithium-ion batteries (LIBs), the as-prepared N, F-rGO film exhibits high reversible capacity and good cycle stability. It delivers an initial discharge capacity of 2133 mA h g −1 and a high reversible specific discharge capacity of 878 mA h g −1 at the current density of 200 mA g −1 . Even at the current density of 2 A g −1 , the reversible specific capacity could be 344 mA h g −1 after 500 cycles. The N, F-double doping and the high-surface area mesoporous structure of rGO provide efficient ionic diffusion path, offering sufficient active sites for lithium-ion storage, resulting in excellent electrochemical performance.