Asfalts beteende i olika exponeringsmiljöer

Sammanfattning

Asphalt is one of the most commonly used materials in road infrastructure and is continuously exposed to environmental conditions that can affect its durability and mechanical properties. Water intrusion, salt exposure, and freeze-thaw cycles are considered major factors contributing to asphalt deterioration. The aim of this study was to investigate how different exposure environments influence the mechanical behavior of asphalt gravel (AG) under controlled laboratory conditions. The study was carried out as an experimental laboratory investigation in which asphalt specimens were manufactured using a standardized asphalt mix with 70/100 bitumen. The specimens were exposed to air, fresh water, salt water, and freeze-thaw cycles. Marshal testing was performed at different time intervals to evaluate Marshall stability, flow value, and stiffness. The results showed that the exposure environments had a clear impact on the asphalt properties. Salt water caused the greatest deterioration, resulting in lower stability and stiffness together with higher deformation values. Freez-thaw cycles also negatively affected the material due to progressive structural damage, while specimens stored in air showed the most stable behavior over time. Fresh water exposure resulted in moderate degradation of the material properties. The study demonstrates that water-related deterioration mechanisms significantly affect asphalt performance and durability. The findings contribute to a better understanding of how environmental factors influence asphalt material and may support the development of more durable pavement structures.