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High and low temperature properties and thermal stability of silica fume / SBS composite modified asphalt mortar

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Document pages: 8 pages

Abstract: In recent years, China has begun to pay more attention to environmental protection. The effective utilization of waste gas from smelting has become a key issue of concern. Silica fume collected from waste gas from smelting ferrosilicon or industrial silicon is usually used as cement concrete admixture. Using silica fume as asphalt modifier can make waste gas profitable. In this study, silica fume SBS composite modified asphalt mortar was prepared to improve the performance of asphalt. The effects of silica fume content, temperature and filling asphalt ratio on composite modified asphalt mortar were studied by cone penetration, softening point, viscosity, dynamic shear rheological (DSR) test and bending beam rheometer (BBR) test.he 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.

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