Smart bituminous material combining anti-icing and self-healing functions using electrothermal graphene microcapsules containing oily rejuvenator

摘要

Pavement icing is a worldwide problem causing serious traffic accidents every year. Recently, new strategic recommendation is made for applying conductive pavement materials to enhance the public safety in snow and ice conditions. Under the excitation of this research background, the aim of this work was to design a smart bituminous material combining anti-icing and self-healing functions using electrothermal graphene microcapsules containing oily rejuvenator. Microcapsule particles were fabricated with an average size of 20 um and 5.0 wt% graphene. Bitumen samples with various content microcapsules (1.0-10.0 wt%) had an increasing electric conductivity trend tested using a four-point probe electrical resistivity instrument. In addition, thermal conductivity of bitumen samples had been greatly enhanced because of the existence of graphene. Anti-icing capability of bitumen samples with graphene microcapsules was sharply increased under a direct voltage (50 V) based on their ice shear force values. Self-healing efficiency of bitumen samples was evaluated by an improved mechanical properties set-up named the beam on elastic foundation (BOEF). With the effect of electrothermal energy conversion, the bitumen samples kept a higher self-healing efficiency after five healing cycles under low temperature of 0 degrees C. These results imply that the graphene microcapsules containing oily rejuvenator is a promise approach to realize the smart pavement combining anti-icing and self-healing functions. (C) 2019 Elsevier Ltd. All rights reserved.