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

Autor(es)

Inocente Domingos, Matheus David ^[1] ; Faxina, Adalberto Leandro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Transportat Engn, BR-13566590 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Road Materials and Pavement Design; v. 16, n. 2, p. 469-480, APR 3 2015.
• Citações Web of Science: 2

Resumo

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)

• Processo FAPESP: 06/55835-6 - Caracterização e modelagem de propriedades reológicas de ligantes, de mástiques e de misturas asfálticas
• Beneficiário: Adalberto Leandro Faxina
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores