Abstract
Carbon nanofiber (CNF) is a nanomaterial with unique mechanical properties, which can improve the properties of composite materials effectively. Types of research focused on the impact of CNF on asphalt, asphalt binder, and mixture. Traditional emulsified asphalt presents a limited performance at both high and low temperature. Meanwhile, emulsified asphalt with better performance is required in engineering. Referring to the research of CNF-asphalt, CNF is considerable to improve the performance of emulsified asphalt. In this study, a preparation method for CNF modified emulsified asphalt with styrene-butadiene rubber (SBR) was proposed. Ultrasonication and surfactant were utilized to disperse the CNFs in water. The optimum dispersion surfactant percentages and ultrasonic energy density to disperse CNFs were determined through ultraviolet-visible spectra (UV-vis spectra). The modified emulsified asphalt was produced using CNFs suspension with SBR as a modifier, and the properties of the residue with different percentages of CNFs were tested. Gel permeation chromatography (GPC) was performed to analyze the molecular size distribution. The results indicated that CNFs improved high-temperature performance of the residue significantly but decreased low-temperature properties. The addition of SBR not only perfected storage stability but also improved low-temperature performance by introducing more small molecules.
Highlights
In the past few years, nanomaterials, especially carbon nanotube (CNT) and carbon nanofiber (CNF), have presented advantages in composite materials and has attracted extensive investigation
This paper proposed a method to prepare Carbon nanofiber (CNF) modified emulsified asphalt
Negative influence on stability is introduced by CNFs: the sample of 0.1 C presents unqualified stability that is much more than the specification requirements (
Summary
In the past few years, nanomaterials, especially carbon nanotube (CNT) and carbon nanofiber (CNF), have presented advantages in composite materials and has attracted extensive investigation. Goh’s research demonstrated that CNFs improved moisture susceptibility performance (decrease the moisture damage potential) of the mixture in most cases, and hot-mix asphalt mixture exhibited the greatest tensile strength with 0.75 wt% nanofibers (Goh et al, 2011). Despite these achievements, there are still issues. The ID of groups with 0.3, 0.5, and 1.0 wt% CNFs are similar
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