DuPont Home
DuPont(tm) Elvaloy(r) RET

Pavement rutting can be significantly reduced using DuPont™ Elvaloy® RET asphalt modifier

Loaded "French wheel" and "Hamburg wheel" tests are among those used to simulate the dynamics of heavy and repeating traffic loads. These tests and newer dynamic shear rheometry (DSR) based tests ... such as Multiple Stress Creep Recovery (MSCR) ... consistently show outstanding rut resistance for pavements made with RET.

One state's DOT shared with DuPont scientists results of Hamburg wheel test results, comparing two PG 64-28 grade asphalts. One grade was modified by air blowing; the other by adding Elvaloy® RET. Both passed SHRP binder tests for their grade rating; however, the grade modified by adding Elvaloy® RET clearly resisted rutting much better (see below).

xxx

In this test, rut depth of 20 mm occurred with the air-blown product after 10,000 cycles. In contrast, after twice as many cycles, ruts were only half as deep (10 mm) in the product made with Elvaloy® RET.

Available Rutting-Related Technical References

Government ministries, universities, asphalt research centers and producers have conducted studies showing RET's excellent rut resistance » Explore rutting studies
mutiple stress creep recovery test
Learn more about Multiple Stress Creep Recovery (MSCR)
One of the newer tests for asphalt is called "Multiple Stress Creep Recovery." Using DSR equipment, it records deformation (unrecovered compliance) of a binder after repeated stresses, thus predicting long-term rutting effects at a given design temperature. » More about MSCR testing