Abstract
With the rapid development of economic construction, styrene-butadiene-styrene (SBS)-modified asphalt is being more and more widely used in highway engineering, but there are still many deficiencies in the process of its use. In order to further improve its performance for use, nano-organic palygorskite (A-Pal) and star-shaped SBS were compounded to obtain modified asphalt in this study. The high-temperature stability of SBS-modified asphalt was enhanced after incorporation with A-Pal for the high-temperature stability test by a dynamic shear rheometer. The A-Pal should improve the surface free energy and adhesion of SBS-modified asphalt by the water stability test analysis. The aging test shows that A-Pal can reduce the thermal oxygen decomposition of SBS and improve the anti-aging performance and the fatigue resistance of SBS-modified asphalt. A-Pal has a certain improvement effect on the low temperature performance of SBS-modified asphalt as shown by a low temperature crack resistance test. A-Pal-compounded SBS-modified asphalt features good storage stability in normal temperatures with the lowest critical compatibility temperature.
Highlights
In recent years, nano-materials and nano-technology have been applied more frequently in the field of pavement traffic materials, and nano-modified asphalt has become one of the hot topics of research [1,2,3,4]
Asphalt is displayed as the continuous phase, and the dispersed-phase SBS was dispersed as the form of an island in the matrix pitch [33]
After adding A-Pal, the compatibility of SBS polymer with asphalt was improved to some extent; the low temperature and fatigue performance of modified asphalt should improve [19]
Summary
Nano-materials and nano-technology have been applied more frequently in the field of pavement traffic materials, and nano-modified asphalt has become one of the hot topics of research [1,2,3,4]. Nano-layered silicate materials are generally applied to asphalt materials because of the large output and good performance [5,6,7]. Palygorskite (Pal), known as attapulgite, is a layered chain water-rich magnesium– aluminum silicate clay mineral. It has a reputation as “the king of earth” for its wide range of applications. The crystal structure of Pal is characterized by the double-layer Si-O tetrahedral sheets that are connected with the single-layer (Mg, Al)-O octahedron sheets and the unit layers are connected by oxygen to form a pore-like crystal structure [11]. Pal has been widely used in the fields of coating materials [13], cement [14], asphalt and other building materials due to its good rheology, adsorbability and lower cost [15,16,17]
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