Title: Interfacial Evolution between Graphene and Cementitious Composites

Author(s): Zhenyu Zhang, Yao Yao, Hu Liu, Dong Zhang, and Yan Zhuge

Publication: Materials Journal

Volume: 121

Issue: 1

Appears on pages(s): 31-40

Keywords: cementitious materials; elevated temperature; graphene; interface evolution; thermal detriment

DOI: 10.14359/51739199

Date: 1/1/2024

Abstract:
Carbon-based nanomaterials such as graphene oxide sheetreinforced cementitious composites have attracted extensive interest owing to their improved post-fire mechanical properties. However, the role of graphene in anti-thermal detriment is still unclear. In the current study, the mechanical characteristics, pore structure, and interface evolution of graphene-toughened cementbased materials under high temperatures are investigated. Scanning electron microscope analysis showed that graphene implanted in the cement matrix had out-of-plane deformation at elevated temperature. The deformation caused the evolution of the interface between graphene and the cement-based material with respect to temperature. Correspondingly, the toughening effect of graphene on cement-based materials decreased first and then increased. The reinforced domain of graphene switched from mesopores to capillary pores when the temperature was beyond 400°C, contributing to the enhanced reinforcement efficiency of the cement mortar. The interfacial evolution process with an in-depth analysis based on multiple scales would benefit from optimizing the design of graphene composites at high temperatures.