Comparative Analysis of Viscosity Characteristic of Rubber Asphalt with Different Preparation Methods

Abstract

Abstract: In order to clarify the influence of preparation methods and process conditions on the viscosity characteristic of rubber asphalt, it was prepared by high-speed shear and mechanical mixing under different preparation temperature, preparation time, rubber powder particle size and rubber powder content. The viscosity variation trend and viscosity composition differences of rubber asphalt between the two preparation systems were compared and analyzed. The Arrhenius equation was used to calculate the viscous flow activation energy (E_η) of two kinds of rubber asphalt, and the difference of viscous flow characteristics and temperature sensitivity was explored. The results show that the viscosity of rubber asphalt of the two preparation systems first increases and then reduces with the increase of preparation temperature, preparation time and the decrease of rubber powder particle size, and the viscosity of shear rubber asphalt is higher than that of mixing system at 135 ℃, 150 ℃ and 165 ℃, but it presents the opposite rule at 180 ℃. With the increase of the amount of rubber powder, the viscosity of the two systems increases, and the viscosity of the mixing system is always greater than that of the shear system. The viscous flow activation energy of shear system is larger than that of mixing system, which indicates that the viscosity of shear system rubber asphalt mainly comes from rubber powder/asphalt interaction, and the shear rubber asphalt is more sensitive to temperature, while the viscosity of mixing rubber asphalt mainly comes from the steric effect of rubber powder and the stability is better than that of the shear system.

Key words: rubber asphalt, mixing technology, shearing technology, influence factor, viscosity characteristic, viscous flow activation energy

CLC Number:

U414

LI Peilong, WANG Xiao, SUN Shengfei, MA Yunfei. Comparative Analysis of Viscosity Characteristic of Rubber Asphalt with Different Preparation Methods[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3159-3167.

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