Reclamite,

City of Orlando, Florida 1997 Rejuvenation Study on Reclamite

The City has been treating low volume streets with Reclamite asphalt rejuvenating agent for about 10 years. An initial application is typically made within one year after placement of the asphaltic concrete for an overlay. Reapplication is scheduled at a period of about 6 years.

The intent of this program is to reverse the effects of “aging” (sometimes referred to as weathering or oxidation) by reintroducing portions of the asphaltic cement lost as a result of weathering. With aging, oxidation occurs and, in effect, reduces the petrolenes fraction of the asphaltic cement. Increasing the petrolenes fraction improves the ductility of the asphaltic cement and therefore pavement durability.

Specifications developed for pavement rejuvenators and prior testing by others have concentrated on verifying that the rejuvenating products decrease the viscosity (or increase the penetration) of the asphaltic cement. Viscosity is measured on asphaltic cement extracted from cores obtained prior to treatment and after treatment with a rejuvenating agent. There is not much information available regarding critical values of viscosity, penetration or ductility that would indicate when pavement is likely to develop cracks. SHRP-A-369 indicates that, in previous studies, penetration less than 10 and ductility less than 20, measured at 25°C, were established to be the limits at which pavement starts to show cracking.

This implies that Reclamite, itself, has good aging characteristics. At the Reclamite recommended dosage of 0.153 parts per 1.0 part asphalt, the rheological properties of the treated asphalt after PAV 20hrs (5- 10 years of service life) were equivalent to PAV,10hrs of the untreated binder (3 - 5 years of service life).

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