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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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

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)