Modify the rheological properties of Daura asphalt by thermoplastic polyurethane using the microwave technique

Abstract

There is a growing need to produce asphalt materials with high economic feasibility, that is the production of asphalt materials with rheological properties that differ from the base asphalt (unmodified asphalt), can be used in many fields such as the production of paving asphalt, where it is not appropriate to use ordinary asphalt. This study included the modification of the rheological properties of Daura asphalt by catalytic chemical treatment with thermoplastic polyurethane(Used in the interior parts of cars) using a microwave oven at a power of (360) watts and at different periods of time. As well as treat asphalt samples with the thermoplastic polyurethane in the presence of sulfur. The modified asphalt samples were studied in terms of ductility, penetration, softening point and penetration Index. A sample with good rheological specification was selected (As7) that are conform with the specifications of Iraqi Roads and Bridges Authority, The selected sample were studied in terms of conducting Marshall tests and comparing them with the original sample in order to demonstrate the possibility of using the modified sample as an paving asphalt. The obtained results showed good specifications in terms of crawl and stability values. An aging test was also conducted on the sample (As7) of the good rheological specifications.