Study on Multiple Effects of Self-Healing Properties and Thermal Characteristics of Asphalt Pavement

Fan Zhang, Yuxuan Sun, Lingyun Kong*, Augusto Cannone Falchetto*, Dongdong Yuan, Weina Wang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Asphalt pavements are prone to cracking in low-temperature environments, and microwave heating (MH) can heal the cracks effectively. This research mainly investigates the different MH effects on the self-healing properties of asphalt mixtures. With this objective, the three-point splitting test is conducted to generate the cracks. A microwave oven is employed to heat the samples, and a thermal camera measures the surface temperature. Results indicate that heating power and time show a positive linear correlation with healing efficiency, and the HI of the samples can reach over 80%. The HI of the samples decreases with the heating cycle, but the sample with reasonable power and time still has a HI higher than 70% after 5 cycles. The temperature peaks on thermal images indicate that uneven heating exists during heating, but the heating uniformity is within an acceptable range. The healing efficiency level (HEL) suggests that asphalt mixtures have very low inefficient healing behavior if the heating time is below 45 s, but HEL can reach 86.14% at 700 W after 60 s. Furthermore, although the HI of strength shows ideal results, the recovery of other crack parameters, including stiffness, fracture energy, flexible index, and crack resistance index, are not satisfactory.

Original languageEnglish
Article number1313
Number of pages14
JournalBuildings
Volume14
Issue number5
DOIs
Publication statusPublished - May 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • asphalt mixture
  • crack parameters
  • heating cycle
  • heating power
  • heating time

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