Elastic Recovery and Quality of Polymer Modified Bitumens

Elastic Recovery is Not Necessarily a Measure of Better Performance

The elastic recovery test has been the de facto method for determining polymer modification qualities since decades, and many agencies include this test as a bitumen specification requirement.

Although the elastic recovery test is successful in detecting the elastomeric modifier, it has been shown not to correlate to performance of bitumen or the asphalt mixture performance.

This whitepaper is written to show that using elastic recovery test or the percent recovery of the MSCR test to define quality of polymer modified bitumen (PmB) could be misleading and could exclude other functional polymers that provide significant benefits to bitumen and asphalt mixture performance.

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