RET SBS Modified Asphalt

- January 01, 2016 -

Extensive test data is available from government agencies, asphalt materials experts and universities, showing Elvaloy® RET to be at least equal, but in most cases superior in performance to SBS-modified asphalt meeting a similar specification grade.

Slower pavement deformation and reduced damage from moisture and temperature extremes, are among the reasons why a well-designed asphalt paving mix made with RET-modified binder can deliver a longer-lasting return on the owners' investment in infrastructure.

Compare the Polymers

Differences between RET and SBS begin with basic polymer chemistry and handling properties.

 • Specifically engineered by DuPont and Chevron for asphalt modification  • Polymer developed in 1940s, primarily for adhesive markets.
 • Storage-stable, since Elvaloy® RET chemically links with the asphalt   • SBS is a dispersion of polymer in asphalt; therefore, separation is possible. 
 • Rail car or barge shipments are possible with Elvaloy® RET.  • Bulk PMA shipment is more difficult due to risk of separation.
 • PMA can be winter-filled and stored for reheating and use later.  • Winter-filling is not recommended.
 • Gentle mixing is all that is needed; a high-shear mill can be used, but isn't necessary.  • High-shear mill required for mixing; increases capital and maintenance investment.
 • Elvaloy® RET is delivered as a free-flowing pellet, so it can be bulk stored and shipped.  • SBS is not bulk shipped or stored.

Compare the Processing

Terminal operators and paving contractors can also benefit from proven Elvaloy® RET asphalt modifier technology.

 • Lower storage, mixing and compaction temperatures  • Higher storage, mixing and compaction temperatures
 • Less energy use in mix plant  • More energy use in the mix plant
 • Less likely to have smoking issues  • More likely to have environmental emissions (smoking) from the mix plant if extra additives are applied
 • Compaction can be obtained more quickly, getting traffic back on the mat sooner.   • Longer compaction times, long lane closures; harder to construct during ever increasing night/weekend paving windows
 • Much less likely to cause fume complaints  • Complaints to authorities about fumes, from workers and the public
 • Fewer complaints from job site neighbors.   • More likely to have fumes at the paving train due to higher temperatures
 • Mat less likely to shove/move due to lower temperatures.  • More likely to have shoving, moving, and tender mix issues
 • Paving crew will think Elvaloy® RET modified asphalt paves much like a neat asphalt.  • Harder to pave with. Crews inexperienced with PMA can have serious paving issues.
 • As mix cools, Elvaloy® RET solidifies to \"lock in\" paving performance.