Rheological behaviour of bitumens modified with PE and PPA at different MSCR creep-recovery times

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: INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING; v. 16, n. 9, p. 771-783, OCT 21 2015.
• Citações Web of Science: 13

Resumo

The main objective of the present study was to determine the effects of longer loading-unloading times on the per cent recoveries (R) and the non-recoverable compliances (J(nr)) of bitumens modified with polyethylene (PE), polyphosphoric acid (PPA) and both additives (PE+PPA). These effects were quantified by means of ratios of R values and J(nr) values at one test condition to another test condition, and the best formulations were reported. The base bitumen is graded as PG 64-xx and the modified bitumens have the same high PG grade (PG 76-xx). All the materials showed lower R values and higher J(nr) values with increasing creep and recovery times from 1/9s to 2/18s, which indicates that they are more susceptible to permanent deformation when both times are longer. These higher J(nr) values at 2/18s and the high PG grade can be mainly attributed to the increase in the viscous portion of the viscoelastic response of the bitumen. (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