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Open AccessArticle

Investigation of the Self-Healing Behaviors of Microcapsules/Bitumen Composites by a Repetitive Direct Tension Test

Department of Polymer Materials, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China
School of Navigational Engineering, Guangzhou Maritime Institute, Guangzhou 510725, China
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China
Author to whom correspondence should be addressed.
Academic Editor: Reza Montazami
Materials 2016, 9(7), 600;
Received: 27 May 2016 / Revised: 5 July 2016 / Accepted: 15 July 2016 / Published: 21 July 2016
(This article belongs to the Section Structure Analysis and Characterization)
The aim of this work was to evaluate the self-healing behaviors of bitumen using microcapsules containing rejuvenator by a modified fracture healing–refracture method through a repetitive tension test. Microcapsules had mean size values of 10, 20 and 30 μm with a same core/shell ratio of 1/1. Various microcapsules/bitumen samples were fabricated with microcapsule contents of 1.0, 3.0 and 5.0 wt. %, respectively. Tension strength values of microcapsules/bitumen samples were measured by a reparative fracture-healing process under different temperatures. It was found that these samples had tensile strength values larger than the data of pure bitumen samples under the same conditions after the four tensile fracture-healing cycles. Fracture morphology investigation and mechanism analysis indicated that the self-healing process was a process consisting of microcapsules being broken, penetrated and diffused. Moreover, the crack healing of bitumen can be considered as a viscosity driven process. The self-healing ability partly repaired the damage of bitumen during service life by comparing the properties of virgin and rejuvenated bitumen. View Full-Text
Keywords: bitumen; microcapsule; self-healing; tension test; strength bitumen; microcapsule; self-healing; tension test; strength
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MDPI and ACS Style

Su, J.-F.; Yang, P.; Wang, Y.-Y.; Han, S.; Han, N.-X.; Li, W. Investigation of the Self-Healing Behaviors of Microcapsules/Bitumen Composites by a Repetitive Direct Tension Test. Materials 2016, 9, 600.

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