Abstract
It is well known that crumb rubber (CR) and styrene–butadienestyrene (SBS) composite modified asphalt has better rheological and engineering performance. However, it always presents very poor compatibility and storage stability. Meanwhile, Trans-polyoctenamer (TOR) can effectively improve the compatibility and thermal stability of rubber asphalt. Thus, this study aims to investigate the effectiveness of TOR on rheological properties, microstructure and thermal stability of CR/SBS modified asphalt. The results show that TOR has a significant influence on strengthening anti-rutting and temperature sensitivity of CR/SBS modified asphalt. However, TOR has a slightly negative influence on the anti-cracking ability for CR/SBS modified asphalt, which still maintains the critical low temperature requirement. Furthermore, TOR could be able to promote the conformation of cross-linked structure between polymer and asphalt, resulting in a significant enhancement in rheological properties and thermal stability of CR/SBS modified asphalt. Lastly, the effects of TOR on viscoelastic performance for modified asphalt markedly depend on the component of neat asphalt, and high asphaltene content is beneficial for improving the rheological behavior effects of TOR.
Highlights
Asphalt concrete, due to the viscoelastic nature in which it distributes load and sustains significant plastic deformation, has been widely used for pavement and waterproofing roof construction [1,2]
The results indicate that TOR can significantly improve the high temperature performance of crumb rubber powder (CR)/styrene–butadienestyrene copolymer (SBS) modified asphalt, which is related to the formation of network structure [11,29]
The addition of TOR would decrease the ductility of CR/SBS modified asphalt, which means that TOR has an adverse effect on the low-temperature performance of CR/SBS modified asphalt
Summary
Due to the viscoelastic nature in which it distributes load and sustains significant plastic deformation, has been widely used for pavement and waterproofing roof construction [1,2]. Polymer modified asphalt is extensively used to enhance pavement performance and extend duration pavement service life, for instance crumb rubber powder (CR), styrene–butadienestyrene copolymer (SBS) as well as some other polymers [1,4,5,6]. Crumb rubber modified asphalt (CRMA) is extensively studied and applied in asphalt pavement for decades [11,12,13,14]. The addition of crumb rubber into asphalt is an efficient method for environmental protection and low cost of asphalt road. Previous studies have shown that CR can enhance the mechanical and rheological properties of asphalt by reducing fatigue and low-temperature cracking distinctly [11,15,16,17,18]. The high viscosity and limited high-temperature performance of CRMA result in higher energy consumption and restrict its wide use [10,19,20]
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