Effect of bio-based additives on bitumen properties

In the last years, the constant shift in bituminous binder sources and qualities have increased interest in identifying new products that can enhance the properties of bitumen. This study is a broad testing overview on the effect of five chemistries, derivate from the pine-trees, on a selected paving grade bitumen. The experimental programme was based on empirical properties, such as penetration value and softening point temperature, and fundamental properties such as dynamic viscosity and rheology-based behaviour. The cross over temperature were used to determine the transition between a more predominantly elastic behaviour and a more predominantly viscous behaviour. It has been noticed that different chemistries can either harden, soften or change the temperature susceptibility of bitumen. Further investigation will include the ageing process effect on these chemistries, to develop products addressed to enhance bitumen quality.