ABSTRACT
The “Ferry-free coastal highway route E39” project entails the construction of several long tunnels along the southwestern Norwegian coast, causing the generation of a remarkable quantity of blasted rocks. The aggregates could be used in the road unbound layers close to the place of production to provide a sustainable cost-benefit application. The research investigates two types of stabilising agents adopted to improve the mechanical properties of the crushed rocks, especially the “weak” rocks not fulfilling the requirements specified by the design guidelines. One additive is based on organosilane and the other additive is based on lignosulfonate. Four types of aggregates are investigated in the laboratory by means of repeated load triaxial tests. Resilient modulus is assessed by Hicks & Monismith model and Uzan model. The resistance against permanent deformation is analysed by Coulomb approach. Results prove that both the mechanical parameters are significantly enhanced by the stabilizing agents.
