The effect of longer creep and recovery times—from 1 / 9 to 2 / 18 s—on the percent recoveries (R) and the nonrecoverable compliances ( J n r ) 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 J n r values decreased at typical high pavement temperatures. Unlike the other asphalt binders, the AC + EVA showed small increases in R and slight decreases in J n r 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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    Titel :

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


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2014-07-07




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Unbekannt



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