Engineering Materials Documents and Information of the Asphalt Institute

For further information see the other engineering areas on the left, Asphalt magazine and APA websites, Asphalt Institute online store 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.

Polyphosphoric Acid Modification of Asphalt

Workshop on PPA Modification of Asphalt Binders
A national workshop on Polyphosphoric Acid Modification of Asphalt Binders was conducted in Minneapolis, MN on April 7-8, 2009. The workshop was jointly sponsored by the Transportation Research Board (TRB), Federal Highway Administration, Minnesota Department of Transportation, TERRA, Association of Modified Asphalt Producers, Innophos, ICL Performance Products, and the Asphalt Institute.
View speaker presentations (both slides and webcast videos)(external link).

The Asphalt has a publication on poloymer modification of asphalt: PPA Modification of Asphalt - IS-220.

The TRB also plans on publishing a circular of papers from the Workshop.

Moisture Sensitivity

Chemistry of Asphalt Aggregate Interaction (PDF 1.1 mb)
The Effects of Dusty Aggregates Towards Stipping in Asphalt Pavements (PDF 158 kb)
Influence of Mix Design Towards Stripping Potential of Asphalt Pavements (PDF 200 kb)
Moisture Damage and the Environmental Conditioning System (PDF 1.2 mb)
Test to Assess the Potential for Moisture Damage In Asphalt Mixtures (PDF 460 kb)

Mixes

Crumb Rubber Bituminous Mixes from Waste Tires (PDF 2.1 mb from Asphalt magazine)