SBS(苯乙烯-丁二烯-苯乙烯嵌段共聚物)是一种性能与橡胶最相似的热塑性弹性体。SBS沥青改性剂主要由苯乙烯-丁二烯-苯乙烯嵌段共聚物与一定量的添加剂和稳定剂组成。SBS改性沥青结合料一直是国内外最常用的路面材料。然而,传统的湿法SBS改性沥青结合料需要制造商提前生产并运输到混合设备进行混合。这为不道德的企业提供了一个机会,通过添加其他物质来减少SBS的数量,允许劣质沥青结合料通过检查而不被发现。同时,传统的湿法SBS改性沥青往往经历相分离和经历性能下降,随着储存时间的增加。然而,干法SBS改性沥青可以直接在搅拌设备中添加,有效解决了传统湿法SBS改性沥青的相关问题。在一定程度上也有助于减少环境污染。本研究对干法SBS改性沥青结合料的提取工艺进行了研究。通过各种试验方法阐明了两种不同用量的干法SBS改性沥青结合料的性能和改性机理,包括基本指标,流变性能,红外光谱,和荧光显微镜。结果表明,由于油的掺入,交联剂,增溶剂,和其他物质加入干法SBS改性剂,在熔融过程中与沥青发生少量化学反应。7%用量的两种干法SBS改性沥青结合料的高低温性能和疲劳性能接近5%用量的湿法SBS改性沥青结合料。
SBS (styrene-butadiene-styrene block copolymer) is a thermoplastic elastomer with properties most similar to rubber. SBS asphalt modifier is mainly composed of a styrene-butadiene-styrene block copolymer with a certain amount of additives and stabilizers. SBS-modified asphalt binder has always been the most commonly used pavement material both domestically and internationally. However, conventional wet-process SBS-modified asphalt binder requires manufacturers to produce it in advance and transport it to a mixing plant for blending. This has provided an opportunity for unscrupulous businesses to reduce the amount of SBS by adding other substances, allowing inferior asphalt binder to pass inspections undetected. At the same time, conventional wet-process SBS-modified asphalt tends to undergo phase separation and experience a decline in performance as the storage time increases. However, dry-process SBS-modified asphalt can be directly added at the mixing plant, effectively addressing the issues associated with conventional wet-process SBS-modified asphalt. It also helps to reduce environmental pollution to a certain extent. This study investigates the extraction process of dry-process SBS-modified asphalt binder. It clarifies the performance and modification mechanisms of two types of dry-process SBS-modified asphalt binder at different dosages through various testing methods, including basic indicators, rheological properties, infrared spectroscopy, and fluorescence microscopy. The results indicate that due to the incorporation of oil, crosslinker, solubilizer, and other substances into dry-process SBS modifier, there is a small amount of chemical reaction with asphalt in the melting process. The high- and low-temperature properties and fatigue properties of the two dry-process SBS-modified asphalt binders at a 7% dosage are close to wet SBS-modified asphalt binder at a 5% dosage.