SBS改性沥青多次再生性能研究

发布时间：2018-11-13 08:39

【摘要】：SBS改性沥青是通过向基质沥青中加入SBS高分子聚合物形成的共混物,由于SBS改性剂能够很好的提高沥青的高低温性能,SBS改性沥青具有优于普通沥青的路用性能。我国的高等级路面建设中大量使用了SBS改性沥青,而从上世纪90年代第一批SBS改性沥青路面铺筑至今,这些路面已经使用了20年之久,2000年后大量铺筑的SBS改性沥青路面也已使用了十多年,这些路面已经进入一次甚至多次的大修、重建阶段,这将产生大量的废旧SBS改性沥青路面材料,为使这些废旧路面材料得到循环利用,研究SBS改性沥青的再生及多次再生问题具有重要意义。需要指出的是,针对SBS改性沥青能否再生存在较大争议,从化学角度分析SBS改性沥青的老化是不可逆的,无法实现再生,本文从行业习惯出发,将老化改性沥青的性能再恢复称为再生。本文研究依托国家科技支撑计划课题:废旧沥青路面再生利用技术装备及示范,围绕SBS改性沥青能否再生及多次再生的问题,通过室内老化及再生试验,从表征SBS改性沥青性能的特征性指标、粘弹特性、再生沥青砂浆流变性能三个方面出发对SBS改性沥青再生效果进行了评价。研究发现,无论是沥青试验还是沥青砂浆试验结果均表明再生剂无法使SBS改性沥青的性能完全恢复到初始水平,但再生剂能够实现改性沥青性能一定程度上的恢复。总的来说,一次再生对SBS改性沥青性能恢复效果较好,再生的改性沥青保留了较多SBS改性的特性。多次再生后改性沥青的特征衰减严重,但沥青仍保留了部分普通沥青所不具备的改性沥青特性。
[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.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U414

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