Hot Mix Asphalt Technology - January/February 2008 - (Page 40)

Illinois Tollway Tests RAP continued Tollway has conducted regarding ground tire rubber (GTR) modified asphalt. • The N50 19.0-mm and N50 subbase mixtures are being used to compare the properties of PG 58-22 and PG 58-28 asphalt binders in higher-RAP mixtures. The last item listed above involves determining the degree of “softness” required when incorporating higher percentages of RAP into HMA. The industry agrees that a softer PG grade is required when using higher percentages of RAP. The analysis of the mixtures that contain the same mix proportions and vary the PG grade will help the Tollway determine which softer grade will be the most acceptable for its HMA. Through the Tollway’s advance work contract on I-90, the higherRAP HMA mix designs have already been created, the highOne issue with fast-tracking any research work involves funding, and the Tollway has limited research funding in its current budget to dedicate to this work. Mindful of the long-term benefits that this work could provide, these organizations contributed time, money and effort to make this research possible: • Rockford Blacktop • Rock Road Companies • Heritage Slag Products/The Levy Company • Rocky Mountain Enterprises, Inc. • Seneca Petroleum • Astec Mobile Screens • Illinois DOT speed processors to fractionate RAP have been set up, and several of the mixes have been produced successfully by Rockford Blacktop and Rock Road Companies to verify that the specified volumetric properties of each mix can be obtained. These higher-RAP densegraded and SMA test production mixes were developed through the Tollway’s materials consultant, S.T.A.T.E. Testing, and will be analyzed for fatigue and durability at the University of Illinois, and for moisture susceptibility by IDOT. The test results may be part of an upcoming University of Illinois research project sponsored by IDOT to study the impact of higher RAP contents on pavement structural performance. That study would be performed using high-RAP laboratory mixes with specific material resources taken from the Tollway’s I-90 project to allow for future comparison to high-RAP production mixes to be placed on the I-90 project. HMAT Ross Bentsen of Bloom Consultants, LLC, is providing materials engineering services to the Illinois Tollway. Steve Gillen is the materials manager for the Illinois Tollway. With advancements in burner development and combustion control systems, Hauck continues to provide the industry with products to • Increase Profitability • Lower NOx Emissions to Ultra-low Levels Without FGR • Support the Use of Multiple Fuels for maximum flexibility • Improve Energy Efficiency Through the Use of VFD and Mass Flow Control Designs Data Collection System BCS 6000 Control Panel PO Box 90, Lebanon, PA 17042 Phone: 717-272-3051 Fax: 717-273-9882 Hauck Manufacturing Company 40 • Hot Mix Asphalt Technology – JANUARY/FEBRUARY 2008 http://www.hauckburner.com

Table of Contents Feed for the Digital Edition of Hot Mix Asphalt Technology - January/February 2008

Hot Mix Asphalt Technology - January/February 2008 Contents Chairman's Commentary President's Perspective A Conversation with the New NCAT Director NCAT Test Track: Real-Time Testing for Real-World Results Warm Mix: The Lights are Green Illinois Tollway Tests RAP in Fast Forwarded Research Big Creek Teams with TxDOT to Pave Using Innovative Asphalt Mix Diamond Achievement Commendation Issues a Call for Quality Calendar of Events CONEXPO-CON/AGG Product Review Index of Advertisers Advertisers.com

Hot Mix Asphalt Technology - January/February 2008

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