"ROAD MANAGEMENT"

The selection of a sequence of appropriate strategies that yield the desired level of service at the lowest cost.

WHAT IS AN ASPHALT REJUVENATOR?

Asphalt consists of two main fractions:
“asphaltenes” which are the hard brittle component, insoluble and not affected by oxidation, and the highly reactive subfractions:

“maltenes” The maltenes are oily and resinous in appearance

The function of the asphaltenes is to serve as the bodying agent.

“Maltene” is the collective name for the remainder of the asphalt material left after the precipitation of the asphaltenes. The 4 bodies of maltenes are:

· Polar Compounds
· First Acidifins — resinous hydrocarbon which act as a solvent
· Second acidifins — act as a solvent
· Saturated hydrocarbons — act as a jelling agent

HOW DOES AN ASPHALT REJUVENATOR WORK?

This relationship of maltene and asphaltene percentage becomes out of balance in the aging process.

HOW DOES AN ASPHALT REJUVENATOR WORK?

This aging process can start as early as initial hot plant production and continues through the pavement life cycle — the effects of time, weather, sunlight, etc.

The cementing agent in an asphalt pavement, the asphalt binder (normally 4-7% by weight) represents the component that experiences premature hardening as a result of oxidation

Asphalt pavements which are structurally sound, deteriorate as a result of oxidation and occasionally as a result of incorrect design or improper construction practice.

The first phenomena, that of oxidation is prevalent in all asphalt pavements.

KEYS TO A QUALITY REJUVENATOR

An asphalt rejuvenator is a manufactured oil or emulsion which has the ability to absorb or penetrate into the pavement and restore those reactive components that have been lost due to oxidation.

KEYS TO A QUALITY REJUVENATOR

· Proper base is essential. A naphthenic or wax free base is ideal — the
molecular make up offers more solvency power or absorption and fluxing
ability.
· Rejuvenators as emulsions are manufactured with 60-65% residual. They have
the ability to “wet” the asphalt binder that is present.
· Fineness of the emulsions particle size is important to aid all components:
wetting, solvency and fluxing.

PREVENTATIVE MAINTENANCE

REJUVENATION FOR: Maintaining good pavements and extending performance life

RESTORATIVE SEALS FOR: Restoration of weathered pavements beyond the scope of a rejuvenator

· If using preventative maintenance systems “rejuvenators” keep that desired
number rating an additional 2 - 5 years typically.
· Use of a rejuvenator on new construction does not seem logical at first.
Applying a surface rejuvenator does several things:

1. restores the original asphalt properties lost in HMA production
2. assists in sealing the pavement
3. improves durability of the surface — durability being the interdependence
between composition and aging.