In the present work a laboratory evaluation of the low-temperature rheological properties of neat andpolyphosphoric acid (PPA) modified bitumens by using a Dynamic Mechanical Analyzer (DMA) is presented.Fundamental rheological properties were evaluated in controlled kinematic conditions and theresults obtained were compared with traditional procedures such as the Fraass breaking point. Theresults show that the effect of polyphosphoric acid addition at low temperature is strongly dependenton bitumen composition (i.e. wax and asphaltene content), nevertheless it seems that PPA is able todecrease the glass transition temperature (Tg) and to increase the stiffness, improving the low temperatureperformance of the modified materials.
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|Titolo:||Low temperature rheology of polyphosphoric acid (PPA) added bitumen|
GABRIELE, Domenico (Corresponding)
|Data di pubblicazione:||2012|
|Appare nelle tipologie:||1.1 Articolo in rivista|