Abstract
In the advanced research fields of solar cell and energy storing materials, graphene and graphene oxide (GO) are two of the most promising materials due to their high specific surface area, and excellent electrical and physical properties. However, they was seldom studied in the traditional materials because of their high cost. Nowadays, graphene and GO are much cheaper than before with the development of production technologies, which provides the possibility of using these extraordinary materials in the traditional construction industry. In this paper, GO was selected as a nano-material to modify two different asphalts. Then a thin film oven test and a pressure aging vessel test were applied to simulate the aging of GO-modified asphalts. After thermal aging, basic physical properties (softening point and penetration) were tested for the samples which were introduced at different mass ratios of GO (1% and 3%) to asphalt. In addition, rheological properties were tested to investigate how GO could influence the asphalts by dynamic shearing rheometer tests. Finally, some interesting findings and potential utilization (warm mixing and flame retardants) of GO in asphalt pavement construction were explained.
Highlights
Stable graphene, as a two-dimensional single sheet, was firstly discovered by Andre Geim and Konstantin Novoselov [1]
Graphene oxide (GO) is the precursor of graphene, which is more convenient to be produced at a large scale
70A, 90A, and GO-modified asphalts were firstly aged by a thin film oven test (TFOT) at 163 ◦ C
Summary
As a two-dimensional single sheet, was firstly discovered by Andre Geim and Konstantin Novoselov [1]. As reported in Zhenhai’s paper, GO could significantly increase the modulus and tensile strength of butadiene–styrene–vinyl pyridine rubber [8] Various polymers, such as carboxylated acrylonitrile butadiene rubber [9,10], polypropylene [11], and poly(arylene disulfide) [12], that were modified by GO to enhance their physical properties. A high elastic modulus and poor viscous modulus in winter may lead to surface cracking. Another of the most serious challenges of asphalt roads is oxidation aging [14,15,16]. GO, as described before, is a potential material to improve the physical properties and anti-aging ability of asphalt. The reason why GO does not show significant improvement on the anti-aging property was explained and some interesting applications (warm mixing and flame retardants) were discussed
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