Abstract
In order to promote the resin modifying agent applied into pavement materials, a type of resin modifying agent was selected as the modifier to prepare modified asphalt. The molecular crystal structure of the modifying material was characterized by using the X-ray diffraction test (XRD). The microstructure and element composition of PA6 was investigated through focused ion beam scanning electron microscopy (FIB-SEM). The thermal property and functional groups of PA6 were studied by thermogravimetric analysis-Fourier infrared spectroscopy (TG-FTIR) test. The physical property and rheological properties of PA modified asphalt were evaluated to confirm the applying feasibility of PA6 in asphalt. The results indicated that PA6 was the semicrystalline polymer and the existence of γ crystal form might improve the toughness of asphalt materials effectively. The thermal decomposition process of PA6 could be divided into three stages roughly: inert weight loss stage, rapid weight loss stage, and stable stage. The amount of PA6 modifier should be appropriately controlled during the application process to ensure the comprehensive effect of PA6 on high-temperature performance and low-temperature performance. The corresponding initial modulus attenuation value of PA modified asphalt was less than 70# asphalt under the same test conditions.
Highlights
Polymer modified asphalt mainly includes thermoplastic elastomers, resins, and rubbers [1]
A type of resin modifying agent was selected as the modifier to prepare modified asphalt. e molecular crystal structure of the modifying material was characterized by using the X-ray diffraction test (XRD). e microstructure and element composition of PA6 was investigated through focused ion beam scanning electron microscopy (FIB-SEM). e thermal property and functional groups of PA6 were studied by TG-FTIR test. e physical property and rheological properties of PA-modified asphalt were evaluated to confirm the applying feasibility of PA6 in asphalt
Under the condition of α crystal form as the dominant condition, the crystallinity of PA6 could be obtained by the crystallinity calculation formula to be 67.7%, which suggested that PA6 was the semicrystalline polymer and the existence of c crystal form might improve the toughness of asphalt materials effectively
Summary
Polymer modified asphalt mainly includes thermoplastic elastomers, resins, and rubbers [1]. Ere are many types of polymers used to modify asphalt, which are divided into three categories generally: rubber, such as natural rubber, styrene butadiene rubber, chloroprene rubber, and butadiene Rubber; thermoplastic elastomers, such as polystyrene-b-polybutadiene-b-polystyrene and polystyrene-b-polyisoprene-b-polystyrene; resins: thermoplastic resins, such as polyethylene, ethylene-vinyl acetate copolymer, and polyamide; thermosetting resins such as epoxy resin [4,5,6]. Different modifiers have their own inherent characteristics. Since the improving mechanism and effect of resin modifiers are still unclear, the application of resin in asphalt material is limited
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