CNSL -Organic Additive to modify bitumen

WMA production can also incorporate waxes or organic additives, which contribute to temperature reduction by lowering the viscosity of the binder.
Cashew nut shell liquid (CNSL) as a natural, renewable, cost-effective, and readily available organic additive to modify bitumen. CNSL is an oil containing unsaturated phenols and exhibiting antioxidant properties. When CNSL is incorporated into asphaltic mixtures, several positive effects are observed. Firstly, it leads to a reduction in stiffness, making the mixture more flexible.
Additionally, CNSL improves the compatibility between the different components of the mixture. It also plays a crucial role in preventing the stripping of aggregates, which helps enhance the resistance of the asphalt mixture against moisture damage.
Overall, the utilization of cashew nut shell liquid in the preparation of warm-mix asphalt proves to be an energy-efficient, environmentally friendly, and effective approach in pavement construction