Mixing and Compaction of Hot and Warm Asphalt Mixtures Workshop

Workshop Overview


Increasing traffic demands and new sustainability initiatives have led to innovation and development within the HMA industry to produce mixes designed to reduce environmental impact during production and demonstrate superior performance while in-service.

To meet these goals specific advancements in technology include increased use of recycled materials, warm mix asphalt using additives and foamed binders, and use of asphalts modified with polymers or chemicals to improve performance properties. With the introduction of these technologies the complexity of mixes has increased substantially relative to conventional products due to interactions between the modifiers and other mix components and extension in the range of production temperatures used in the field. As a result, use of conventional viscosity based methods to select mixing and compaction temperatures and evaluation of mix designs based solely on volumetrics is insufficient.

The overall goal of selection of mixing and compaction temperatures in the mix design process is to determine the range of temperatures at which the mix can be constructed to achieve density and perform well in the field.Mixture performance is dictated by both asphalt binder properties and the quality of the aggregate structure developed during compaction. The objective of this workshop is to introduce new technologies to evaluate both of these mix components and to provide an open forum for discussion on how these technologies can be applied to improve current mix design procedures. In addition, the workshop includes a hands-on demonstration of application of these technologies to the mix design process.


The registration fee is $795 for the one day workshop and an additional $295 for the hands-on training session. Discounted fees of $695 and $245 for the one day workshop and training session are available for WAPA members. Please register at:


All attendees present will be awarded 1.0 Continuing Education Units (CEUs) for both days of the workshop. One CEU is equivalent to 10 Professional Development Hours (PDHs). Please contact Ann Pahnke if you have any questions.

Dates and Location

April 30 to May 1, 2014
University of Wisconsin-Madison College of Engineering
1415 Engineering Dr.
3609 Engineering Hall
Madison, WI 53706

List of Topics

(Download Workshop Program in PDF)

Day 1: Technical Workshop
 9:00 - Welcome and Introduction
 9:15 - New Concepts to Assess the Role of Asphalt Binder Properties in Mixture Compaction
10:15 - Effects of RAP, WMA Additives, and Modification on Binder and Mastic Workability Properties
11:15 - Influence of Aggregate Properties on Workability and Performance
12:00 - Lunch (Provided)
 1:00 - Effects of Compaction Temperature on Mixture Workability
 2:00 - New Tools to Evaluate Aggregate Structure and Mix Stability
 3:00 - Applications to Field Production and Different Compaction Methods
 4:00 - Research Progress and Opportunities for Further Development
Day 2: Laboratory Hands-On Session (Optional)
 9:00 - Image Processing and Analysis System (iPas) to Evaluate Aggregate Packing
10:00 - Gyratory Pressure Distribution Analyzer (GPDA)
11:00 - Asphalt Lubricity Tests in the DSR