Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Accelerated short-term ageing effects on the rheological properties of modified bitumens with similar high PG grades

Full text
Author(s):
Inocente Domingos, Matheus David [1] ; Faxina, Adalberto Leandro [1]
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: Road Materials and Pavement Design; v. 16, n. 2, p. 469-480, APR 3 2015.
Web of Science Citations: 2
Abstract

The main purpose of the study was to evaluate the effects of rolling thin-film oven (RTFO) ageing on some rheological properties of modified bitumens. They are graded as PG 76-xx and were obtained from a 50/70 bitumen graded as PG 64-xx. Three types of polymers - polyethylene (PE), styrene-butadiene-styrene (SBS) copolymer and ethylene butylacrylate glycidylmethacrylate (Elvaloy((R))) terpolymer - and polyphosphoric acid (PPA) were selected. Ageing mainly increased the complex modulus (G{*}) and decreased the phase angle (delta) of the bitumens, thereby increasing their stiffness and elasticity. The existence of plateau regions in the master curves of delta for the bitumen+Elvaloy+PPA and the bitumen+SBS can be explained by the distinctive characteristics of the modifiers, since these plateaus were not observed for the other bitumens. The bitumen+SBS and the bitumen+PE showed very high sensitivity to ageing from the point of view of G{*} and delta, and the opposite is observed for the conventional properties. (AU)