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Asphalt Pavement Thickness and Mix Design

While there are an infinite number of questions that can be asked, we compiled a list of those questions that have been directed to us the most. These FAQs are categorized into subject areas listed in the contents dropdown box below.

We tried to keep both the questions and answers concise. Additional information is referenced where applicable for those seeking more in-depth information on a given subject.

For further information see the Thickness & Mix Design Documents, other engineering areas, Asphalt magazine and APA websites, and the links page for other information related to these topic area.

We also recommend that you attend our Asphalt Academy courses at sites throughout the country to obtain expert instruction on asphalt topics.

Mix and Thickness Design

For an asphalt pavement in a container terminal, is there any rules of thumb as to what the maximum load could be without causing damage?
Is there a problem with milling up and recycling asphalt mixes that used polymer modified binders?
What is the proper nominal aggregate size to use?
What is the recommended air void content for compaction of asphalt pavements?
How is air void content controlled?
What is the process or how is Density Target Value established or determined?
Is there a limit on the percentage of RAP utilized in new installations.What about RAP use for resurfacing of old asphalt roads? Any limits?If there are limits on the use of RAP in new or resurfacing installations, who sets the limits?
What is the proper mix temperature?
How do the lab-compacted air voids of reheated asphalt mixture samples compare to the air voids of original mixture samples, as-produced, not reheated?

Liquid Asphalt

How do you determine the thermal conductivity of asphalt cement?
What is the vapor pressure of asphalt at typical storage temperatures?
What is the typical thermal BTU value for a pound of asphalt?
What is a typical value for the specific heat of asphalt cement?
How can I learn more about polyphosphoric acid modification of asphalt?

Special Applications

Is there a way to color an asphalt pavement other than shades of black and grey?

Railroads

Does AI have any information about asphalt and its use in railroad beds?

Additional AI Resources

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