Properties of Printer Waste Toner Modified Bitumen

For the deficiency of the existing technology of petroleum bitumen, the printer (copier) waste toner (PWT) as the major additive, a proper amount of aluminate coupling agent and stearic acid synergist as the auxiliary additive were added to the base bitumen. A new kind of modified bitumen was developed and prepared. In order to evaluate the technical performance of the PWT modified bitumen and the bituminous mixtures, especially assess the high temperature performance, we compared the softening point and PG grade of Qilu 70# base bitumen and the PWT modified bitumen, and compared the Marshall test and rutting test results of the PWT modified bituminous mixtures and Qilu 70# bituminous mixtures. The results show that the PWT can improve the softening point of base bitumen about 3 degrees C-8 degrees C, accordingly, not only improve the high temperature stability of bituminous mixtures, reduce rutting, but also maintain the low temperature anti-cracking performance of bitumen and bituminous mixtures and show the good social, economic and environmental protection benefits. This technology overcomes the technical problem, the low temperature performance is sorry to be reduced when the high temperature performance is improved, which is posed by only adding the PWT to the base bitumen.