Study of Rubber Asphalt Modification Mechanism
The paper studies the modification mechanism of asphalt rubber blending system by means of scanning electron microscopy, infrared spectroscopy, differential thermal analysis, component analysis and chemical analysis. The results indicate that the swollen rubber powder is mutually-adhered to form a network structure and the matrix asphalt changes from homogeneous body into a two-phase continuous blending structure system constituted by rubber powder and asphalt; physical swelling dominates the system, accompanied by a little chemical reaction and with the prolongation of time, the chemical reaction becomes more obvious; the swollen rubber powder forms damping effects to improve the viscosity of rubber asphalt. The modification of asphalt comes from two aspects: firstly, the network structure formed by swollen rubber powder, secondly, the modification of the asphalt composition resulting from rubber powder desulphurization degradation; the natural rubber has better performance in modifying asphalt than synthetic rubber.
Jianmin Zeng, Taosen Li, Shaojian Ma, Zhengyi Jiang and Daoguo Yang
X. F. Wang "Study of Rubber Asphalt Modification Mechanism", Advanced Materials Research, Vols. 194-196, pp. 844-847, 2011