Archived: FHWA Asphalt Intelligent Compaction Demonstration
What is Intelligent Compaction (IC)

A typical IC System (courtesy of Bomag)
Intelligent Compaction (IC) is an equipment-based technology for better quality control that results in longer pavement lives. IC machines are vibratory rollers with accelerometers mounted on the axle of drums, global positioning system, infra-red temperature sensors (for asphalt), and on-board computers that can display color-coded maps in real-time to track roller passes, asphalt surface temperatures, and stiffness of compacted materials.
Who We Are
The FHWA has been leading a national effort to advance the IC technology through numerous projects since 2008 to improve compaction quality of materials that include granular soils, cohesive soils, stabilized base, and asphalt pavements. To further accelerate the implementation of IC, FHWA is conducting IC research to further investigate the correlation between IC and in-place asphalt densities.
Asphalt IC Field Projects Wanted
The FHWA IC research team is seeking eight (8) asphalt projects in 2012 and 2013 for this study. The requirements for the projects are two (2) lifts, 1 mile or more asphalt construction as extensive coring would be conducted at the base course (further details on page 2). The steps for an IC demonstration are:
- Select an asphalt paving project
- Provide a special provision document (including IC training)
- Convene planning meetings
- Perform field demonstration
- Conduct an open house event
Contacts
If you are interested in participating in this study and providing candidate asphalt projects, please contact:
Dr. George Chang, P.E., Principal investigator (PI) Transtec Group, 6111 Balcones Drive, Austin TX 78731
(512) 451-6233 gkchang@thetranstecgroup.com
IC Project Requirements
Project Materials/Layers/Length
The requirements of the IC demonstration projects include:
- Materials: Hot mix asphalt (HMA) or warm mix asphalt (WMA) overlay or full depth construction
- Layers: at least two (2) lifts of construction while the bottom lift will be the focus of this study
- Length: at least 1 mile or more of the projects will be used for detailed study
Recommended IC Systems
All systems must be equipped with RTK GPS, accelerometer-based measurement systems, infra-red temperature sensors, and an on-board computer display system. The IC data outputs should also be compatible with the Veda IC software. The recommended double-drum IC systems include but not limit to the following (in order of trade names): Bomag, HAMM/Wirtgen, and Sakai.
Field Demonstration
The activities during the demonstration consist of:
- Day 1 : IC setup and training
- Day 2: IC compaction (at breakdown position), and GPS/field point tests
- Day 3: IC compaction (at breakdown position), GPS/field point tests, and coring at about 50 locations within the Day 2 section (coring locations coincide with previous field point tests)
- Day 4: Open House event (optional)
Depending the actual progress, the coring may be conducted for the Day 3 section instead. Along with IC and field point measurements during breakdown rolling, other compactions (asphalt densities after screed, intermediate rolling, and finish rolling) will be monitored during construction in order to relate the majority of factors to the core densities
Who are welcome to participate
- DOT Construction Engineers, QC/QA Personnel, Spec Writers
- Paving Managers, Superintendents, QC Personnel
- Earthworks Managers, Superintendents, QC Personnel
- IC Roller Vendors
Recommended Double-drum IC Systems
Bomag
HAMM/Wirtgen
Sakai
Veda IC Software
Sponsored by
- U.S. Department of Transportation, Federal Highway Administration
Supported by
- Asphalt Institute
- NAPA National Asphalt Pavement Association
More information is available at: www.fhwa.dot.gov/pavement/ic