Effect of phenolic resin on the rheological, chemical, and aging properties of SBR-modified asphalt
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Effect of phenolic resin on the rheological, chemical, and aging properties of SBR-modified asphalt Peifeng Cheng, Yiming Li*, Zhanming Zhang Department of Civil Engineering, Northeast Forestry University (NEFU), No. 26 Hexing Road, Xiangfang District, Harbin, 150040, China Received 17 March 2020; received in revised form 20 August 2020; accepted 5 September 2020
Abstract
In this study, the effects of phenolic resin (PF) on the permanent deformation and short-term aging resistance of SBR-modified asphalt binder were investigated. Multiple stress creep recovery (MSCR) tests, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC) were performed to investigate the effect of PF on the deformation resistance and aging resistance of SBR-modified asphalt with PF (S4P3). The results show that PF can significantly improve the permanent deformation resistance and aging resistance of the asphalt binder. In addition, S4P3 showed different molecular weight changes during the aging process, and the percentage of large molecular size (LMS) in asphalt has a significant impact on the deformation recovery ability and temperature sensitivity of asphalt. Keywords: Phenolic resin; Styrene–butadiene rubber; Short-term aging; Deformation resistance; FTIR; GPC
1. Introduction Styrene–butadiene rubber (SBR) has been known since its discovery for its effective improvement of low-temperature properties, and has been used as an asphalt modifier [1]. In early 1987, an engineering brief from the United States (US) Federal Aviation Administration website introduced the advantages of SBR modifiers, improved the low-temperature ductility of asphalt, and enhanced its adhesion and cohesion properties [2]. In addition, SBR-modified asphalt has a higher ductility value than SBSmodified asphalt at all test temperatures, which also means that SBR-modified asphalt is more suitable for cold regions than SBSmodified asphalt [3,4]. However, the long-chain butadiene present in SBR molecules is easily oxidized, so aging has a significant impact on the performance of SBR-modified asphalt binders [5]. In addition, it was also found that the improvement of the hightemperature performance of asphalt binders by SBR is limited [6]. These two shortcomings limit the applicability and development of SBR-modified asphalt in cold regions. Therefore, to obtain a high-performance SBR-modified asphalt binder, additional modifications are required. Extensive research has been conducted
* Corresponding author E-mail addresses: [email protected] (P. Cheng); [email protected] (Y. Li). Peer review under responsibility of Chinese Society of Pavement Engineering.
to improve the high-temperature performance of SBR-modified asphalt binders, aging resistance, and its storage stability [7-9]. Research has indicated that polymers can be introduced into the SBR-modified asphalt based on physical or chemical modification methods, and SBR com
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