Midwestern Pavement Preservation Partnership

[Pages:82]Midwestern Pavement Preservation Partnership

October 22 ? 25, 2007 Missoula, Mt.

Asphalt Rejuvenators

A Contractors perspective

Maltene Based Asphalt Rejuvenator

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 sub-fractions: "maltenes" These maltenes are oily and resinous in appearance

The Age Of A Pavement Is Not The Primary Factor

In Choosing Candidates For A Rejuvenator Application

The Primary Importance Is The Condition

Of The Pavement

"Right Treatment Right Pavement Right Time"

Which component changed?

Asphalt Cement

Stable component:

Asphaltenes

Reactive components:

Saturated hydrocarbons (paraffins)

First acidaffins Second acidaffins Polar compounds

Chemical Composition of Asphalt Cement

Asphalt cement consists of five component groups:

Asphaltenes(A), the bodying agent gives asphalt its black color, is hard and brittle like pencil lead.

Maltenes, which provide the cohesive and flexible qualities of the asphalt cement. They are categorized as:

?Polar compounds or Nitrogen bases (N)- components of highly reactive resins, which act as a peptizer for the asphaltenes. ?First acidiffins (A1)- components of resinous hydrocarbons which function as a solvent for the peptized asphaltenes. ?Second acidiffins (A2)- components of slightly unsaturated hydrocarbons that also serve as a solvent for the peptized asphaltenes. ? Paraffins (P) ? saturated hydrocarbons, which function as a gelling agent for the asphalt components

Asphalt Components Relationship

A-combined with-N-allows-A1-,A2 -and-P-to mix withAN-holding-A-in solution as long as balanced ratios of-

A-to-N-and-N-to-P-are maintained

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