Highly Modified Asphalt (HiMA), a technology developed by Kraton, is designed to enhance durability and processability in asphalt pavement applications. The technology has more than twice the polymer loading of ordinary asphalt, which makes the asphalt act like asphalt-modified rubber instead of rubber-modified asphalt, enabling it to be more resistant to fatigue and deformation. The HiMA mixes are readily workable and easy to lay in the field, enhancing construction efficiency and performance.
HiMA significantly improves the structural pavement’s resistance to rutting and cracking under most circumstances, leading to longer product life. Thinner pavements can achieve equivalent engineering properties, and the asphalt layer’s upfront reduction and paving costs typically offset additional HiMA polymer loading. Both scenarios deliver reduced life cycle costing. This technology also enhances surface durability, increasing resistance to cracking and rutting since thin lift asphalt overlays and inlays, and micro surfacing treatments are regularly used to protect existing pavement from weather and traffic load stresses.
- Wearing courses for high traffic, or harsh climate roads
- Pavement preservation overlays
- Cement concrete overlays
- High performance base courses at reduced thickness
- Waterproofing bridge deck asphalt
- More durable porous asphalt
- Racetrack and airport pavements
- Bitumen emulsions for chip seals with superior stone retention
- Heavy duty pavement including terminal platform, toll plaza, parking lot
Kraton is committed to proving and advancing our innovations. We collaborate with several third-party agencies and regulatory bodies to ensure we work towards solutions that address transportation needs.
Kraton was an asphalt test track sponsor with the National Center for Asphalt Technology (NCAT) at Auburn University. We constructed a HiMA section on the 1.7 mile track in a control group, and since the test track cycle commenced in 2009, Kraton tested the technology on section North 7 for five years as a structural pavement construction. Results were that even though the HiMA section is 18 percent thinner than the control group, after 5-plus years and 20,000,000 axle loads of heavy truck traffic, it showed only one-third as much rutting and no bottom-up fatigue cracking.
As part of the Transportation System Preservation Technical Services Program (TSP2), Kraton has worked with the National Center for Pavement Preservation (NCPP) at Michigan State University to develop a HiMA thin lift asphalt specification. The program, sponsored by the American Association of State Highway and Transportation Officials (AASHTO), includes 10 participating US Department of Transportation in northeastern states and Professor Walaa Mogawer, the director of the Highway Sustainability Research Center at the University of Massachusetts Dartmouth.
HiMA can solve a variety of asphalt pavement challenges since the technology for asphalt base courses allows pavement thickness reductions of 30-40 percent, delivering cost savings upfront.
The model calculator below can help show how this reduction works. Just input the following information:
- Lift thicknesses, mix density and typical costs for in-place hot mix.
- Select whether each lift is already polymer modified asphalt (PMA).
- Select which lifts to convert to HiMA.
- Adjusted thicknesses for the HiMA mixes to see how the raw material cost varies.
The model is intended as an example to show trends, not as a tool to predict actual pavement cost, as it is a simplistic model that only accounts for in-place hot mix costs with the same mix designs and overall pavement design. It assumes a 1.2 factor cost increase for modified versus unmodified asphalt binder and a 1.4 factor for HiMA versus unmodified. Other construction considerations may impact final results.
Features and Benefits
- Enhance asphalt durability
- Longer product life
- Decrease construction time
- Higher polymer loading
- Resistant to fatigue and deformation
- Resistant to rutting and cracking
HiMA THICKNESS vs COST MODEL
Reasonable efforts have been made to assure the accuracy of the data, modeling and information provided by Kraton Corporation; however, the data, modeling and information have been provided for informational purposes, and is furnished on the express condition that the recipient shall make their own assessment to determine the suitability of such information for their particular and individual purposes. Kraton Corporation does not imply any guarantee or warranty of the accuracy of the data, modeling or information as estimated. The data, modeling and information represent a commercially reasonable evaluation based on our own operations, public information and estimated material costs which can change at any time without notice. Kraton Corporation assumes no liabilities resulting from any inaccuracies or omissions of the data, modeling and information provided, or from use of such data, modeling and information. Kraton Corporation DISCLAIMS ALL EXPRESS AND IMPLIED WARRANTIES WITH RESPECT TO THE DATA, MODELING AND INFORMATION AND DISCLAIMS ALL IMPLIED REPRESENTATIONS AND WARRANTIES PROVIDED BY STATUTE OR COMMON LAW INCLUDING BUT NOT LIMITED TO ANY WARRANTY OF MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE OR USE. IN NO EVENT SHALL Kraton Corporation BE LIABLE TO ANY PARTY FOR ANY LIABILITY OR DAMAGES WHATSOEVER, INCLUDING BUT NOT LIMITED TO INDIRECT, CONSEQUENTIAL, PUNITIVE, INCIDENTAL, RELIANCE, EXEMPLARY OR SPECIAL DAMAGES ARISING OUT OF PROVIDING THIS DATA MODELING AND INFORMATION.