Effect of Nano-CaCO₃@SiO₂ on Viscoelasticity of Asphalt

Abstract

Dynamic thermal mechanical analysis was used to evaluate the viscoelasticity of asphalt. The parameters included the energy storage modulus (E), the loss modulus (E′), and the loss tangent (tanδ). The impact of three kinds of particles containing CaCO₃ with different size and structure on the mechanical properties was also measured. The addition of limestone increases the glass transition temperature, while nano-CaCO₃@SiO₂ decreases the glass transition temperature. Nano-CaCO₃ has a negligible effect on the glass transition temperature. The particle size of the limestone is 0.075 mm, which is a material at the micrometer level. During the heating process, it hinders the molecular movement and makes the material harder. Thus the glass transition temperature is relatively high.

Keywords

asphalt / low-temperature performance / glass transition / nano-CaCO₃

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature