SBS Content Testing And Quality Evaluation Of SBS Modified Asphalt

Due to high volume of traffic and heavy loads on road surfaces, ordinary asphalt is usually not qualified enough to fulfill the requirements of modern highway systems and improvements need to be implemented to enhance pavement performance of asphalt. With its widely recognized satisfactory performance, SBS modifier has become one of the most promising polymer highway pavement modifiers in China. Dosage and processing quality of the modifier are the key issues in controlling the quality of SBS modified asphalt and preserving durability of pavement.Based on experiments and theoretical analysis, this research conducted the following works:by testing several technical performance indicators including penetration, softening point and ductility, etc, discovered that linear correlation between dosage of SBS modifier and the three indicators is poor; by using Saal formula and testing viscosity of modified asphalt under various temperatures, found that there is significant leaner correlation between lglgηof SBS modified asphalt and lg(T+273.15); through infrared spectroscopy analysis, found that trans-butadiene in SBS can be used as a basis in measuring the dosage of SBS; Based on fluorescence microscopy and image processing technology, using micro-phase structure as the indicator and combined with analysis on performance decays after long-term and short-term aging, evaluated the processing quality of SBS modified asphalt.With results from the experiments and analysis above, this paper summarized methods in testing the dosage of SBS modified asphalt and evaluating processing quality of it. These methods are important in managing and controlling the quality of SBS modified asphalt.