The effect of the addition of small quantities (1 wt%) of phosphoric or polyphosphoric acid and other phosphorus compounds on the physical and chemical characteristics of straight-run (distillation) bitumens was studied. The effect was similar to that induced by a mild blowing process: the peptized material increased, with a shift towards a gel structure, and minor effects on penetration and low-temperature properties were observed. The resistance to ageing measured by the RTFO test was greatly increased, indicating a way of improving the ageing resistance of straight-run bitumens. Besides the lower cost, an advantage of such a process over blowing is the fact that the original bitumen specifications are not dramatically affected; moreover, the low-temperature behaviour is not modified. © 1995.
Improving the ageing resistance of straight-run bitumens by addition of phosphorus compounds / DE FILIPPIS, Paolo; Giavarini, Carlo; Scarsella, Marco. - In: FUEL. - ISSN 0016-2361. - STAMPA. - 74:6(1995), pp. 836-841. [10.1016/0016-2361(95)00015-w]
Improving the ageing resistance of straight-run bitumens by addition of phosphorus compounds
DE FILIPPIS, Paolo;GIAVARINI, Carlo;SCARSELLA, Marco
1995
Abstract
The effect of the addition of small quantities (1 wt%) of phosphoric or polyphosphoric acid and other phosphorus compounds on the physical and chemical characteristics of straight-run (distillation) bitumens was studied. The effect was similar to that induced by a mild blowing process: the peptized material increased, with a shift towards a gel structure, and minor effects on penetration and low-temperature properties were observed. The resistance to ageing measured by the RTFO test was greatly increased, indicating a way of improving the ageing resistance of straight-run bitumens. Besides the lower cost, an advantage of such a process over blowing is the fact that the original bitumen specifications are not dramatically affected; moreover, the low-temperature behaviour is not modified. © 1995.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
