| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Transportat Engn, BR-13566590 Sao Paulo - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | JOURNAL OF TRANSPORTATION ENGINEERING; v. 140, n. 11 NOV 2014. |
| Web of Science Citations: | 0 |
| Abstract | |
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(nr)) 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 degrees C. The base binder experienced a decrease in its rutting potential after the addition of modifiers because the R values increased and the J(nr) 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(nr) at lower temperatures (up to 64 degrees C) with increasing loading-unloading times, which can be translated into minor reductions in its susceptibility to rutting when both times were doubled. (C) 2014 American Society of Civil Engineers. (AU) | |