Laboratory Evaluation of the Effect of SBS Polymer on the Performance Properties of Bitumen and Asphalt Mixture Containing Nano Silica and Gilsonite
Authors
1 Department of Civil Engineering, Malard Branch, Islamic Azad University, Malard, Tehran, Iran.
2 Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
Abstract
Due to the problems of high cost, difficult processing and unfavorable storage stability of bitumen modified with 1SBS, a lot of research has been done on composite bitumen to achieve superior pavement performance. In this study, the asphalt mixture was modified by nanosilica, gilsonite and SBS. Asphalt binder main performance tests, rutting tests, low temperature bending tests, moisture sensitivity tests, fatigue tests, and durability tests of asphalt mixture modified with SBS, gilsonite, nanosilica/rock asphalt, and nanosilica/ gilsonite/SBS were conducted to determine the performance Their structure should be evaluated. By comparing the results of the tests with the properties of the unmodified asphalt mixture, nano-silica and stone asphalt led to the improvement of the structure performance. The modified asphalt mixture with nanosilica/gilsonite/SBS had higher stability temperature, low temperature cracking resistance, lower moisture sensitivity, and longer durability than asphalt binder modified with 5% SBS, except for similar fatigue life.
Keywords
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