Study on long-term deformation and draindown properties of rubberized porous asphalt

The current research focused on the feasibility of CR incorporation in porous asphalt and the effectiveness on the permanent deformation behavior by the following high lights. In the first stage, a broad investigation (Literature review study) have been done in order to clarify the potential effectiveness of CR incorporation in any hot mix asphalt mixture by dry process, more focus on the porous asphalt experience. In the following the draindown test conducted in order to assess the feasibility CR replaced by common draindown fibers. Finally, experimental work continued by Creep characterization to evaluate the influence of CR on permanent deformation deficiencies of porous asphalt. In the current research, the Polymer Modified Bitumen (PMB) is used during the mix design procedure, and in this way the compatibility of the PMB with CR investigated. In addition, the workability of the mixture considering the CR dry process incorporation with PMB was visually investigated and compared. The results proved that the application of CR by dry process could improve the draindown properties of the mixture comparing to the conventional mixtures using common draindown mixtures, which from the economic and environmental point of view is crucial. The Uniaxial Cyclic Compression test results (creep characteristics) did not show apparent and remarkable differences within the reference (control) mixtures.