Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber

In this paper, two types of Styrene-Butadiene-Rubber (SBR) were adopted to modify the Buton-rock asphalt (BRA) modified asphalt, aiming to select a binder with excellent comprehensive performances. Powder SBR and latex SBR (0%, 2%, 4%, 6%, and 8%), were mixed with the 15 w% BRA modified asphalt. The...

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Bibliographic Details
Published in:Applied sciences 2020-05, Vol.10 (9), p.3077
Main Authors: Qu, Fangting, Lv, Songtao, Gao, Junfeng, Liu, Chaochao
Format: Article
Language:English
Subjects:
Aging
anti-aging capacity
Asphalt
Asphalt pavements
Butadiene
Buton-rock asphalt (BRA)
compound modified asphalt
Fourier analysis
Fourier transforms
Infrared spectroscopy
Latex
Low temperature
Mechanical properties
performance contrast
Powder
Rheological properties
Rheology
Rocks
Rubber
Scanning electron microscopy
Scrap
Shear modulus
Styrene
Styrene-butadiene rubber
Styrene-Butadiene-Rubber (SBR)
Styrenes
Thermal stability
Thin films
Viscometers
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Summary:In this paper, two types of Styrene-Butadiene-Rubber (SBR) were adopted to modify the Buton-rock asphalt (BRA) modified asphalt, aiming to select a binder with excellent comprehensive performances. Powder SBR and latex SBR (0%, 2%, 4%, 6%, and 8%), were mixed with the 15 w% BRA modified asphalt. The characterization of rheological properties included dynamic shear rheometer, rotational viscometer, and bending beam rheometer test. The short-term aging performance was characterized by the ratio of the complex shear modulus from the un-aged and rolling thin film oven (RTFOT) -aged asphalt. Besides, Fourier transform infrared spectroscopy and scanning electron microscopy were conducted to reveal the modification mechanism. It was observed that the two kinds of BRA-SBR modified asphalt had preferable anti-crack capacity at low temperatures than the BRA modified asphalt. Compared with latex SBR, the powder SBR significantly improved the high-temperature performance, and the anti-aging capacity was stable. However, some negative influence occurred by the addition of latex SBR on the anti-rutting and short-term aging property. According to the micro-mechanism analysis, adding powder SBR and latex SBR into BRA modified asphalt was a physical blending process, and they improved the dispersion state of BRA in asphalt. Based on the comprehensive performance, the recommended combination was BRA and powder SBR.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10093077