Impact of Mixing process on the physical and Rheological Characteristics of Asphalt Binder Modified with Nano- Silica Powder

1st International Conference on Petroleum Technology and Petrochemicals

石油天然气工程

Zghair, Hussein H.^1 ; Joni, Hasan H.^1 ; Hassan, Maan S.^1

Civil Engineering Department, University of Technology, Baghdad

10066, Iraq^1

关键词: Environmental conditions;    Flexible pavements;    Modified asphalt binders;    Nano silica powder;    Nanosilica particles;    Rheological characteristics;    Rotational viscosity;    Temperature sensitivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/579/1/012046/pdf
DOI  :  10.1088/1757-899X/579/1/012046

来源: IOP

【 摘 要 】

In Iraq pavements materials are exposed to various distresses due to the adverse environmental conditions and heavy traffic. The improvement of performance of flexible pavements is necessary for decreasing these distresses. The objective of this research is to improve the mixing efficiency of nano-silica particles with asphalt binder. Two mixer type (mechanical and high shear), rotational speeds (2000, 4000 and 6000 rpm), and mixing period (30 and 60 minutes) were assessed. Three nano-silica per cent 2%, 4%, and 6% by weight of asphalt were added and the asphalt binder mixtures were prepared by heating at mixing temperature 140 °C. Furthermore, comparisons were made to assess the modified asphalt binder characteristics such as penetration value, softening point, temperature sensitivity (penetration index), ductility and rotational viscosity. Results showed that the use of nano silica as an additive was useful in improving the asphalt binder characteristics. Generally, has been found that the penetration value decreased and softening point increased, as well as the viscosity, were increased and the temperature sensitivity was developed. Additionally, high shear mixing was more useful especially to obtain a good dispersion of nano silica powder in asphalt binder and got a homogenous composite material.