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Colloid and Polymer Science

, Volume 293, Issue 12, pp 3505–3516 | Cite as

Size optimization and self-healing evaluation of microcapsules in asphalt binder

  • Daquan Sun
  • Jinlong Hu
  • Xingyi Zhu
Original Contribution

Abstract

Adding self-healing microcapsules into the asphalt binder seems to be an effective way to autonomously repair the micro-cracks in asphalt concrete, slow fatigue cracks growth rate, restore original mechanical properties, and further enlarge the fatigue life. Size including the diameter of the capsules and the thickness of the shell wall is one key parameter significantly determining the properties of microcapsules. Eleven microcapsule samples fabricated under different stirring rates with different core/shell thickness ratio are prepared. An optimal set of parameters suitable for introduction into asphalt is studied based on the microscope observation, component identification, and thermogravimetric estimation. The self-healing capability of the selected microcapsules is further evaluated based on the fatigue life recovery test. From testing results, it is shown that microcapsules fabricated under the 800 rpm stirring speed with 1:1 core/shell thickness ratio have a much more satisfactory size and shell structure, and present superior capability to improve the healing behavior of asphalt.

Keywords

Microcapsule Self-healing Asphalt Size optimization Fatigue life 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 51378393 and 11102104) and the Innovation Program of Shanghai Municipal Education Commission (No. 15ZZ017).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji UniversityShanghaiPeoples’ Republic of China

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