Abstract
Recently, China has started paying more attention to environmental protection, and the efficient utilization of exhaust gases produced by smelting has emerged as a key problem concern. The silica fume collected from the exhaust gases produced by smelting ferrosilicon or industrial silicon was often used as a cement concrete admixture. Using silica fume as an asphalt modifier can make exhaust gases profitable. In this study, silica fume/SBS composite-modified asphalt mortar was prepared to improve the performance of asphalt. The effects of the silica fume content, temperature, and ratio of filler asphalt on the composite-modified asphalt mortar were studied through the cone penetration, softening point, viscosity, dynamic shear rheological (DSR) test, and bending beam rheometer (BBR) test. The thermal stability of composite-modified asphalt was analyzed through the thermal analysis test. The results showed that with the increase of silica fume content and ratio of filler asphalt, the high-temperature performance of asphalt mortar was improved; the content of silica fume had a great influence on the low-temperature performance of asphalt mortar, the optimum silica fume content was 7%; increasing the ratio of filler asphalt reduced the low-temperature cracking resistance of asphalt mortar; the incorporation of silica fume enhanced the initial decomposition temperature, thermal residual rate, temperature in which the weight loss rate reaches the maximum, and the endothermic peak of maximum temperature and improved the properties of asphalt.
Highlights
Asphalt pavement constitutes more than 90% of the expressway in China for its good smoothness, low noise, convenience, and ease of maintenance [1, 2]. erefore, the study of the high-quality modified asphalt and its mixtures has become an important research area in the field of road traffic, for reducing the early disease and prolonging the service life of asphalt pavement
The cone penetration test was used to evaluate the consistency of the asphalt mortars. e angle of the cone was 30°, and the cone was made of stainless steel
It could be seen that increasing the ratio of filler asphalt greatly improves the high-temperature performance of asphalt mortar
Summary
Asphalt pavement constitutes more than 90% of the expressway in China for its good smoothness, low noise, convenience, and ease of maintenance [1, 2]. erefore, the study of the high-quality modified asphalt and its mixtures has become an important research area in the field of road traffic, for reducing the early disease and prolonging the service life of asphalt pavement. Erefore, the study of the high-quality modified asphalt and its mixtures has become an important research area in the field of road traffic, for reducing the early disease and prolonging the service life of asphalt pavement. It has been found that silica fume has many properties, such as abundant reserves, low cost, large specific surface area, low thermal conductivity, strong thermal stability, and strong adsorption capacity. It has great advantages in improving asphalt’s high- and low-temperature performance, fatigue performance, and water stability [6,7,8,9,10,11]. Wei et al studied the diatomite and SBS composite-modified asphalt by using regression analysis and a modified grey model. Tan et al carried out the low-temperature bending test, low-temperature compression test, and contraction coefficient test of matrix
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