As an asphalt modifier, waste polypropylene (RPP) can not only optimize the performance of asphalt but also greatly alleviate the problem of waste plastic treatment, effectively reducing environmental pollution and resource waste. In order to evaluate the influence of RPP and styrene butadiene styrene (SBS) on asphalt performance, the application of RPP in modified asphalt pavement has been expanded. In this study, a dynamic shear rheometer (DSR), bending beam rheometer (BBR) and other instruments were used to evaluate the rheological properties of composite-modified asphalt. Fourier infrared spectroscopy (FTIR) and fluorescence microscopy (FM) was employed to conduct a microscopic analysis of the modified asphalt, and the layer analysis method was adopted to determine the optimal RPP content. The test results show that the rheological properties of asphalt are significantly improved by the composite modification of RPP and SBS. In addition, the cross-linking between polymer and asphalt is further enhanced by the composite addition of RPP and SBS. The comprehensive performance of modified asphalt is optimized at the RPP content of 2%, which is suitable for applications in the cold temperate zone. The RPP/SBS composite-modified asphalt is able to improve the utilization rate of RPP and has good environmental and economic benefits, thus exhibiting excellent comprehensive performance. However, the optimal asphalt content in the mixture was not investigated, and the economic benefits brought by the utilization of RPP were not evaluated and require further study.

In the analysis of the rheological properties of the plant oil pitch, the original analysis method has a narrow range of analysis indicators, which affects the reliability of the analysis results. In this study, a new analytical method for the rheological properties of the plant oil pitch was designed. The microstructure characteristics of the plant oil pitch were obtained using a high-power microscope, the viscosity of the plant oil pitch was measured, and the ductility of the plant oil pitch was analyzed by setting the analysis index. The above parts are integrated, and the dynamic shear tester is used to complete the analysis of pitch rheological properties. So far, the analysis method for the rheological properties of the plant oil pitch has been designed. It can be seen from the comparison of the experimental links that this analysis method is better than the original analysis method in terms of the scope of analysis indicators. In conclusion, the analytical method of the rheological properties of the plant oil pitch is more reliable.

In order to explore the diffusion and regeneration of bio-oil in aged bitumen, waste cooking oil (WCO), waste wood oil (WWO) and straw liquefied residue oil (SLRO) were selected in this paper. According to the surface wetting theory, the contact angle is obtained by combining laboratory experiments with molecular dynamics (MD) simulation, and the wetting parameters are calculated to evaluate the wetting behavior of bio-oil. The experimental phenomena of the wetting process and the main factors driving wetting are further analyzed. A permeation experiment is designed to obtain the permeation fusion layer (PFL). If the crossover modulus of PFLs changes compared with that of the aged bitumen, it is determined that the bio-oil penetrates the corresponding fusion layer. The results show that the motion of bio-oil included spreading and shrinking processes, and a precursor film played a pivotal role in the transportation of nanodroplets. Higher surface tension, lower viscosity and cohesion can effectively promote the wettability of bio-oil. A higher temperature and a longer permeation time are conducive to the permeation of bio-oil in aged bitumen. WCO with the strongest wettability has the weakest permeability, while WWO has superior permeability and can activate the macromolecules’ surface activity, but its wettability is relatively weak. It is necessary to further modify WCO and WWO to be suitable rejuvenators.

The design illustrates the working principle of the spring cold warning system in kiwifruit orchards, develops a warning scheme based on the Internet of Things and wireless sensor networks, establishes a three-dimensional model of the frame structure of the kiwifruit orchard and the wind-blocking device through SolidWorks software, and selects a heat sink and a heat regulating device according to the actual planting environment. The design was simulated using the CIIC IOT comprehensive experimental platform. The experimental results showed that the system performed well, all the designed functions could be realized, the sensing module data collection was accurate when the outdoor temperature decreased to 1°C, and the controlled motor, electric heating module and fan could start normally, which verified the feasibility and practicality of the kiwifruit orchard spring cold warning system and provided a theoretical basis for the actual future kiwifruit orchard It provides a theoretical basis for future practical construction of kiwifruit orchards.

Due to the diversity of plant asphalt sources and refining processes, the composition and properties of the various plant asphalts are also different. The plant asphalts are used to preserve the green environment. The natural material is eco-friendly; hence, the usage of plant asphalts is getting promoted these days. There are some problems in the road performance of some source plant asphalt, so the change characteristics of the microstructure of the modified plant asphalt are analyzed in this paper. Firstly, the raw materials are prepared, then the experimental plan is made, and finally the microstructure change characteristics of asphalt at different dosages of 0%, 0.25%, 0.5%, 0.75%, and 1% are studied using the soft computing techniques. It is found that with the increase of the content of polyphosphate, the structure of modified asphalt has changed. The most obvious change is that the volume of asphaltenes becomes smaller, the number of asphaltenes increases, the area of asphalt micelle becomes smaller, and the area of dispersion medium becomes larger. The experimental study is performed to guide the right material for road construction which is eco-friendly for maintaining the green environment.