Multiple Stress Creep-Recovery Test of Ethylene Vinyl Acetate and Polyphosphoric Acid-Modified Binder

The effect of longer creep and recovery times—from 1/9 to 2/18 s—on the percent recoveries (R) and the nonrecoverable compliances (Jnr) of some modified asphalt binders was investigated. A 50/70 base asphalt cement [AC, penetration grade (PG) 64-xx] was modified using ethylene vinyl acetate (EVA) copolymer, polyphosphoric acid (PPA), and a combination of both additives to produce the AC+EVA, AC+PPA, and AC+EVA+PPA formulations, respectively. These formulations have the same high PG grade in the original Superpave specification (PG 76-xx). All the materials were tested at five equally spaced temperatures ranging from 52 to 76°C. The base binder experienced a decrease in its rutting potential after the addition of modifiers because the R values increased and the Jnr values decreased at typical high pavement temperatures. Unlike the other asphalt binders, the AC+EVA showed small increases in R and slight decreases in Jnr at lower temperatures (up to 64°C) with increasing loading-unloading times, which can be translated into minor reductions in its susceptibility to rutting when both times were doubled.


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  • Accession Number: 01531483
  • Record Type: Publication
  • Files: TRIS, ASCE
  • Created Date: Jul 24 2014 3:22PM