부산대학교 도서관

Swelling and dissolution of crumb rubber exist in hot asphalt, resulting in volume expansion and mass attenuation. To analyze the effect of particle changes of crumb rubber on the viscosity of rubber asphalt, the stirring process was used to prepare rubber asphalt under different conditions. And the relationship between the parameters of volume expansion ratio (VR), mass attenuation ratio (T) and particle change composite index(φ) of crumb rubber particle and the viscosity of rubber asphalt was analyzed. Infrared spectroscopy (IR) analysis was conducted on the asphalt samples separated from crumb rubber to ascertain the phy-chemical behavior. The results show that the parameters VR and T can respectively reflect the volume expansion and mass attenuation degrees of rubber particles in asphalt, and the index φ can effectively characterize the comprehensive particle changes of crumb rubber in rubber-asphalt system. The variation trend of the parameter φ is consistent with the viscosity of rubber asphalt, and the two have a good exponential relationship. With the increase of preparation temperature," and the viscosity of rubber asphalt both increase first and then decrease,and the peak values appear at 180 °C, that is, the comprehensive effect of swelling and dissolution of crumb rubber contributes the most to the viscosity. The rising temperature will lead to adequate dissolution and partial degradation of rubber with mass attenuation, which cause that the volume expansion rate and the viscosity of rubber asphalt decrease. In the process, some of rubber molecules are degraded by chain breaking, and the absorption peaks of typical functional groups are significantly enhanced. The degradation degree is closely related to the preparation temperature and time. The steric hindrance of rubber particles caused by the volume expansion and the viscosity enhancement of asphalt phase caused by the dissolution and modification of rubber molecules are the main sources of viscosity for rubber asphalt. [ABSTRACT FROM AUTHOR]