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.
Low temperature rheology of polyphosphoric acid (PPA) added bitumen
Baldino N;GABRIELE, DOMENICO
;OLIVIERO ROSSI, Cesare;Seta L;Lupi FR;Caputo P.
2012-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
