SBS改性瀝青多次再生性能研究
[Abstract]:SBS modified asphalt is a blend formed by adding SBS polymer to the asphalt. Because the SBS modifier can improve the high and low temperature performance of asphalt, SBS modified asphalt has better road performance than ordinary asphalt. SBS modified asphalt has been widely used in the construction of high grade pavement in our country, but it has been used for 20 years since the first batch of SBS modified asphalt pavement was built in 1990s. After 2000, a large number of SBS modified asphalt pavement has been used for more than ten years. These pavements have entered a stage of overhaul and reconstruction, which will produce a large number of waste SBS modified asphalt pavement materials. In order to recycle these waste pavement materials, it is of great significance to study the regeneration and multiple regeneration of SBS modified asphalt. It should be pointed out that the aging of SBS modified asphalt is irreversible and can not be reclaimed from a chemical point of view in view of whether it can be regenerated or not. The performance recovery of aging modified asphalt is called regeneration. In this paper, based on the national science and technology support project: recycling technology equipment and demonstration of waste asphalt pavement, the problem of whether or not SBS modified asphalt can be regenerated and reclaimed many times is studied, and the indoor aging and regeneration tests are carried out. The effects of SBS modified asphalt were evaluated from three aspects: characteristic index, viscoelastic property and rheological property of recycled asphalt mortar. It was found that both asphalt test and asphalt mortar test showed that the properties of SBS modified asphalt could not be completely restored by regenerating agent, but the performance of modified asphalt could be restored to a certain extent by regenerating agent. In general, the performance recovery of SBS modified asphalt is better by primary regeneration, and the reclaimed modified asphalt retains more properties of SBS modification. The characteristic attenuation of modified asphalt is serious after repeated regeneration, but the asphalt still retains the modified asphalt characteristic which some ordinary asphalt does not have.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U414
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