Abstract
In the seasonal frozen regions, freeze-thaw (F-T) damage is the main pavement damage, causing a variety of poor conditions in bitumen pavement, such as cracks, pits, potholes, and slush. In previous studies, we evaluated the effect of nano hydrophobic silane silica (NHSS) on the degradation of asphalt mixture under F-T cycles, and established the damage model of NHSS modified asphalt mixture in spring-thawing season. To gain more understanding of the influence of NHSS on asphalt in spring-thawing season, NHSS modified asphalt was systematically analyzed under F-T aging process in this study. The main research objective of this paper was to investigate the deteriorating properties of NHSS modified asphalt under Freeze-thaw aging process. Within this article, the physicochemical characteristics of NHSS modified asphalt were determined by using various laboratory tests, which included basic property test, dynamic shear rheometer test (DSR), Fourier transform infrared spectroscopy test (FTIR) and thermogravimetric analysis (TGA). The results showed that the incorporation of NHSS could inhibit the F-T aging process of asphalt. Moreover, the chemical composition and thermal stability of asphalt under F-T aging process was analyzed through FITR and TGA test parameters. The results illustrated that the sulfoxide functional groups content index was more suitable for evaluating the aging degree of asphalt in the spring-thawing season and the F-T aging process had a great impact on the thermal property of NHSS modified asphalt.
Highlights
Asphalt is the most common pavement building material, and more than 94% of pavements use asphalt materials, which give a high service level for citizens [1,2]
The complex modulus and the rutting factor variation tendency of BA, CBMA and NHSSMA with temperature is basically the same, which indicates that the addition of carbon black and nano hydrophobic silane silica (NHSS) does not change the viscoelastic properties of asphalt
NHSSMA is increased by 22~27% and 82~92% compared with BA respectively, while the increase in rutting factor of CBMA and NHSSMA is 21~28% and 45~48%
Summary
Asphalt is the most common pavement building material, and more than 94% of pavements use asphalt materials, which give a high service level for citizens [1,2]. In the seasonal frozen regions, freeze-thaw (F-T) damage is the main type of pavement damage, causing a variety of poor conditions in asphalt pavement, such as cracks, pits, potholes, and slush. These conditions shorten the service life of asphalt pavements, increase the maintenance frequency and costs, and affect the smooth flow of traffic and transportation safety [5,6,7].
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