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The creep-recovery behavior of asphalt binders/cements modified with SBR copolymer (AC+SBR), polyphos-phoric acid (AC+PPA) and a combination of both (AC+SBR+PPA) at temperatures from 52 to 76 °C was analyzed by means of the multiple stress creep and recovery (MSCR) test. All the formulations have the same high PG grade (PG 76-xx) and the 50/70 base binder is graded as PG 64-xx. Increases in the percent recovery (R) and decreases in the nonrecoverable compli-ance (Jnr) were observed after the modification process, which is favorable to the AC resistance to rutting. The AC+SBR+PPA and the AC+PPA showed similar acceptable traffic levels within the whole temperature range, and they were higher than the ones obtained for the AC+SBR. This indicates that PPA may be an alternative to replace the SBR copolymer on asphalt cement modification, provided that the formulation is not highly susceptible to fatigue cracking and thermal cracking.

Comportamento fluência-recuperação de ligantes asfálticos modificados com copolímero SBR e ácido polifosfórico