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.