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 1/9 s to 2/18 s, which indicates that they are more susceptible to permanent deformation when both times are longer. These higher J nr values at 2/18 s and the high PG grade can be mainly attributed to the increase in the viscous portion of the viscoelastic response of the bitumen.


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    Title :

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




    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    56.24 / 56.24 Straßenbau