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.
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Amin, G.M., Esmail, A. Application of nano silica to improve self-healing of asphalt mixes. J. Cent. South Univ. 24, 1019–1026 (2017). https://doi.org/10.1007/s11771-017-3504-y
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DOI: https://doi.org/10.1007/s11771-017-3504-y