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Journal of Central South University

, Volume 24, Issue 5, pp 1019–1026 | Cite as

Application of nano silica to improve self-healing of asphalt mixes

Article

Abstract

Nano silica due to its spherical shape, tiny size and higher density compared to bitumen, may have an inherent potential to improve hot mix asphalt (HMA) self-healing. In this research scanning electron microscopy (SEM) images were used to investigate size, morphology and dispersion of nano silica particles. Additionally, HMA self-healing mechanism was also examined by SEM. Furthermore, dynamic indirect tensile test (IDT) was used to evaluate HMA self-healing index. The SEM results indicated that bitumen mortar flowing into micro cracks may be one of the most important mechanisms of HMA self-healing. The experiment results also showed that modification of bitumen by nano silica promotes the ability of the HMA self-healing.

Key words

nano silica healing index Taguchi method hot mix asphalt 

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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringAmirkabir University of TechnologyTehranIran

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