Avaliação dos efeitos da radiação ultravioleta sobre propriedades reológicas de ligantes asfálticos modificados com PPA e copolímeros SBS e SBR
DOI:
https://doi.org/10.14295/transportes.v25i1.1100Keywords:
Ultraviolet irradiation, Long-term aging, Modified asphalt binders.Abstract
The aging process suffered by asphalt binders interferes directly with the mechanical properties of HMA mixes. In order to avoid an excessive hardening of the asphalt binder, the specifications limit certain aging indices or aging param-eters. However, asphalt binder specifications do not take account of the effect of the ultraviolet radiation (UV) on the rheo-logical properties of such materials. The objectives of this work are (i) to quantify the effects of the UV radiation on the rheological properties of a 50/70 pen-grade asphalt binder and five asphalt binders modified with polyphosphoric acid and the SBS and SBR copolymers (binder+PPA, binder+SBS, binder+SBS+PPA, binder+SBR and binder+SBR+PPA) and (ii) to compare the aging levels caused by UV radiation with the aging level in the PAV. The samples aged in the PAV and in the wetherometer were previously aged in the RTFO oven. The use of modifiers increased the resistance to long-term aging of the materials, either in the PAV or in the wetherometer. The binder+SBR+PPA showed the best performance in terms of aging resistance.Downloads
References
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