Rejuvenation treatments for aged pavements

This paper considers the process of oxidative aging of bitumen in general terms and the process of rejuvenation. Emulsion is the best way to deliver such a system; it can be in a number of forms including a rejuvenation sealer, an enrichment emulsion or a chip sealing emulsion. In this work Fulton Hogan developed an engineered emulsion based product with the assistance of Opus consultants for the purpose of sealing and rejuvenation in one step. The development, testing is described. The application on an aged slurry surface at Whakatane airport in February 2006 is described. In this project a chipsealing version was applied, this was polymer modified and designed as a single coat grade 6 seal. Surface texture, cracking and stone loss are being monitored on a monthly basis. Similar work carried out in the state of California in USA is also discussed with respect to longer-term performance. Such systems appear to have the capability of reducing reflective cracking and maintaining pavement integrity. (a)