http://yetl.yabesh.ir/yetl1/handle/yetl/19019 2026-04-12T13:20:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4309850 Prediction of Cable Deterioration Based on the Characteristics of Delamination Corrosion on Hot-Dip Galvanized Steel Wire Jian Guo; Yile Zhong The cables of cable-supported bridges are susceptible to corrosion damage after decades of service. The early cable systems were predominantly composed of hot-dip galvanized (HDG) steel wires. The coating thickness of steel wires cannot be precisely controlled or accurately measured due to the imperfections of the hot-dip galvanizing process. There is a lack of experimental data specifically for HDG steel wire despite a wealth of atmospheric corrosion data for zinc and steel. A method for rapidly predicting the level of deterioration of cables after obtaining the characteristics of delamination corrosion on steel wire with different coating thickness based on empirical corrosion parameters (A,n) of zinc and iron in different environments is proposed in this study. The corrosion kinetics models for HDG steel wires (Φ5) in both environments is also derived in this study, using marine and nonmarine environments as examples. The reliability of models was verified by comparing them with atmospheric corrosion experimental data of zinc and steel. The corrosion processes of the wires were simulated using cellular automata, and corrosion control parameters were obtained by integrating these simulations with the corrosion kinetics models. These parameters were then used to simulate cable corrosion and predict cable deterioration progression. 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4309849 Thermal Equilibrium Process When Mixing Asphalt with Reclaimed Asphalt Pavement: Experimental Investigation and Simulation Quan Liu; Jiangyu Liu; Ruiyu Fang; Yuting Han; Jiantao Wu The thermal equilibrium of asphalt mixtures, when combined with reclaimed asphalt pavement (RAP), forms the foundation for high-quality hot pavement recycling. This study focuses on quantifying the thermal equilibrium process of recycled asphalt during mixing. To achieve this objective, a typical RAP content of 20% was utilized in preparing the recycled asphalt. In the experiments, three preheated RAP temperatures were considered to reflect different practical scenarios. Thermal images of recycled asphalt were captured throughout the entire mixing process from 10 s to 90 s in order to characterize the temperature evolution pattern of recycled asphalt mixtures. In addition to experiments, discrete element simulation was conducted to elucidate additional details regarding temperature exchange. The results indicated that the initial thermal equilibrium during mixing may have a significant impact on RAP dispersion and temperature variation, while the subsequent mixing period has limited influence on the final thermal state. Furthermore, it is observed that complete thermal equilibrium cannot be achieved due to the nonuniform distribution of RAP at the end of mixing. In addition, a model describing the temperature evolution of RAP is proposed in this study, which demonstrates a good fit with the data. 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4309848 Fiber Treatment for Improving Foam Concrete Flexural Behavior Jiehong Li; Taehwan Kim; Ailar Hajimohammadi Foam concrete is widely used in situations where toughness is crucial. Adding polyvinyl alcohol (PVA) fibers is a common way to make foam concrete stronger and tougher. However, these fibers show extremely high bond strength with the matrix, causing them to break prematurely when the foam concrete cracks, which reduces their effectiveness. This study introduces a novel water-based water-repellent treatment for PVA fibers in foam concrete with a density of 800  kg/m3. Test results show that treated fibers had a weaker bond with the concrete, pulled out longer during bending tests, and distributed better. Although treated fibers slightly decreased the foam concrete’s compressive strength (by up to 13%) compared to untreated fibers, they significantly increased flexural strength and toughness and made the cracks narrower. Treated fibers improve toughness by 20.8% at a displacement of 0.8 mm compared to untreated fibers. This toughness enhancement would likely be even greater at longer displacements. 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4309847 Application of Graphene–Basalt Fiber Asphalt Mixtures in Pavement Engineering in Seasonally Frozen Regions Huzhu Zhang; Wenjia Yang; Jinxuan Zhao; Penglei Lv; Lijuan Sun Seasonally frozen regions present significant challenges in the construction, operation, and maintenance of roads. It is not possible to attain sufficient improvement in the performance of asphalt mixtures under seasonally frozen conditions using a single external additive. Therefore, dense-grained asphalt mixture AC-13 was selected as the research object in this study. Graphene and basalt fiber were applied for the composite modification of matrix asphalt mixtures (AM), and response surface methodology (RSM) was used to determine reasonable graphene and basalt fiber contents and the optimal asphalt aggregate ratio. The composite modification effect and the feasibility of its application in asphalt pavement in seasonally frozen regions were verified via road performance and freeze–thaw resistance performance tests. The evolution laws of road performance parameter indicators for graphene–basalt fiber asphalt mixtures (GBFAM) under different graphene contents, basalt fiber contents, and asphalt aggregate ratios were studied, and a significance analysis of the factors and the interactions among them was conducted. The results demonstrate the practicality of the GBFAM mixing ratio determination based on the RSM. Furthermore, compared with AM, the GBFAM exhibited superior overall performance. The optimal asphalt aggregate ratio for the GBFAM was 5.32%, with a graphene content of 0.20% and basalt fiber content of 0.30%. The GBFAM road performance parameters increased within a certain range of variation based on the optimum graphene content, basalt fiber content, and asphalt aggregate ratio, and subsequently decreased with increasing graphene content, basalt fiber content, and asphalt aggregate ratio; furthermore, the road performance parameters were approximately maximized around the optimum mixing ratio parameters. Thus, the results show that the graphene content, basalt fiber content, and asphalt aggregate ratio significantly affect the GBFAM road performance. Moreover, GBFAM exhibits excellent road performance and can be used in seasonally frozen regions for asphalt pavement engineering. Special natural climatic conditions and the combined effect of traffic loads contribute to the development of rutting, cracks, looseness, spalling, and other issues, which seriously decrease the quality and service lives of roads, and the addition of modified materials is a common method to reduce these issues. Considering the advantages of graphene or basalt fiber for improved road performance of asphalt mixtures and in order to overcome the limitations of a single modified material in improving the performance of asphalt mixtures, graphene and basalt fiber were applied for the composite modification of AM, and RSM was used to determine the GBFAM optimal mixing ratios parameters. Verification of applicability for seasonally frozen regions was performed through road performance and freeze–thaw resistance performance tests, and the influencing road performance factors and economic costs of GBFAM were analyzed. The research results can provide the foundation and reference for the pavement engineering application of GBFAM in seasonally frozen regions, which is of great practical significance for reducing asphalt pavement diseases in seasonally frozen regions, extending the lifetime of the road and achieving a low carbon environment. 2025-01-01T00:00:00Z