Effect of Healing Agents on Crack Healing of Asphalt and Asphalt Mortar
1
State Key Lab of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
2
Department of Physics and Electronics, South Eastern Kenya University, 170-90200 Kitui, Kenya
3
Research Institute of Highway Ministry of Transport, Beijing 100088, China
4
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1373; https://doi.org/10.3390/ma11081373
Received: 19 June 2018 / Revised: 28 July 2018 / Accepted: 2 August 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Environment-Friendly Construction Materials)
This study investigated the effect of seven healing agents on crack healing ability of long-term aged asphalt and its mortar. Different healing agents including sunflower oil, aromatic oil, bitumen emulsion, and maltene-based emulsions were used. The crack healing of asphalt made use of two asphalt disk samples and healing was evaluated using direct tensile tests. For asphalt mortar, notched semi-circular samples were used. Test results indicated that the crack healing of asphalt and its mortar depended strongly on the type of healing agent. In general, asphalt healed faster than its mortar. Asphalt healing could be well improved by using oil agents, while asphalt mortar could be well healed with maltene-based emulsions. The crack healing of asphalt mortar developed rapidly followed by a steady state of increase. Initial crack healing using healing agents could be contributed by the diffusion and softening effects, which resulted in low strength recovery. Long term healing could lead to the bonding reconstitution in the cracks, which were decisive for the final strength gain. The promising healing agent should be able to achieve maximum strength recovery to resist cracking as well as a sufficient re-healing ability to deal with crack opening and closing.
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Keywords:
asphalt; asphalt mortar; healing agents; crack healing; healing model
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MDPI and ACS Style
Pan, C.; Tang, P.; Riara, M.; Mo, L.; Li, M.; Guo, M. Effect of Healing Agents on Crack Healing of Asphalt and Asphalt Mortar. Materials 2018, 11, 1373.
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