Modified Slurry Surfacing for Pavement Rehabilitation

The operational performance of thin-layer surfacings like Slurry Surfacing is characterized by susceptibility to shear stresses at high temperatures (causing aggregate raveling) and thermal cracking at low temperatures. This study investigates the effect of modifiers on bitumen properties to improve the functional performance of such layers. BND 70/100 bitumen and polymer-modified bitumen Orlen Orbiton 45/80-55 were evaluated. Binders were modified with Dinodor A1 adhesion promoter (0.5%), Sasobit synthetic wax (3.0%), and Calprene-501 M SBS polymer (3.0%). Properties were evaluated under European standards and the Superpave system. Adding 3.0% SBS polymer proved most effective: it forms a 3D polymer network and expands the binder's performance temperature range to PG 76-28, providing high rutting resistance and low-temperature elasticity. Sasobit wax increases stiffness (PG 70-22), but fails to improve low-temperature performance.