Life time prediction for low energy and ecological effects bituminous mixtures

- Life time prediction is based on accumulated damage & consumed time for every damage.
- Fatigue has the most important contribution for the total damage of the pavement.
- Higher rutting in modified bitumen (sasobit, cecabase, foam, RAP) compared to reference.
- Bad rutting results concluded that WMA for hot climate needs further investigation.

Road surfaces with low temperature bitumen are usually used due to the lower energy consumption and environmental considerations.This paper presents a study of the performance of low temperature bitumen, in particular, the long-term behavior and life-time prediction of some low-temperature bitumen. Six bitumen mixture samples were tested with different modifiers such as synthetic Cecabase (C), Sasobit (S), Greenseal (G) and Advera (A) wax. Pavement performance prediction in terms of fatigue cracking and surface rutting is essential for any mechanistically-based pavement design method. In this study full-scale Accelerated Pavement Testing (APT) has been used to simulate field conditions and Equivalent Standard Axles (ESAs). Fatigue response was also analyzed in the laboratory. This paper focus on developing a life time prediction model based on rutting and fatigue to describe the stable and unstable performance of six tested low energy bitumen mixtures.