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| Analysis on relationship between properties and components of asphalt after multiply recycling |
| Key Laboratory of Transport Industry of Road Structure and Material, Research Institute of Highway Ministry of Transport, Beijing 100088, China |
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Abstract To investigate the mechanism of multiply recycled asphalt, the law of each component and colloidal instability index of asphalt in the multiply recycled process was analyzed by chemical composition test of asphalt with four-component test. The correlation between component and physical properties of penetration and ductility of asphalt was discussed. Based on the relationship among rejuvenating agent dosage,chemical composition and physical properties, the improvement effect of rejuvenating agent in the multiply recycled process was revealed. The results show that with the increasing of recycling numbers, the asphaltene content of asphalt is increased, while the aromatic content and colloid content are decreased. The saturated content is stable, and the colloid instability index is increased. The design of multiply recycled asphalt should focus on the coordination and matching of chemical components to improve the pavement property.
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Received: 22 July 2020
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2022, Vol. 43 
