Recently a wide spectrum of modifying polymeric materials have been test mixed with the bitumens used in road construction; among them, a new class of heterophasic polyolefin copolymers which show little stability when mixed with certain bitumens, especially when stored for long periods at high temperatures. The problem can be solved by adding phosphorous compounds, especially polyphosphoric acid, which shift the bitumen structure from sol to gel. In fact, it was demonstrated that the stability of polymer modified bitumens depends not only on the difference in density and viscosity between bitumen and polymer, but also on bitumen structure.
Polyolefinic polymers for the production of highly stable modified bitumens / Giavarini, Carlo; Santarelli, Maria Laura; DE FILIPPIS, Paolo; Scarsella, Marco. - STAMPA. - 3:(1996), p. PAPER E&E.6.163. (Intervento presentato al convegno 6th EURASPHALT & EUROBITUME CONGRESS tenutosi a Strasbourg nel 6-10 May).
Polyolefinic polymers for the production of highly stable modified bitumens
GIAVARINI, Carlo;SANTARELLI, Maria Laura;DE FILIPPIS, Paolo;SCARSELLA, Marco
1996
Abstract
Recently a wide spectrum of modifying polymeric materials have been test mixed with the bitumens used in road construction; among them, a new class of heterophasic polyolefin copolymers which show little stability when mixed with certain bitumens, especially when stored for long periods at high temperatures. The problem can be solved by adding phosphorous compounds, especially polyphosphoric acid, which shift the bitumen structure from sol to gel. In fact, it was demonstrated that the stability of polymer modified bitumens depends not only on the difference in density and viscosity between bitumen and polymer, but also on bitumen structure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.