Interface bonding and toughening mechanism of graphene oxide-modified carbon fiber/C-S-H
YANG Xin
ZHANG Yubo
LIU Yanhui
Abstract：Traditional carbon fiber cement-based composites(CFRC)generally suffer from poor fiber/matrix compatibility and weak interfacial adhesion.In this study,molecular dynamics(MD)simulations were employed to investigate the influence of graphene oxide(GO)on the physicochemical properties of carbon fiber(CF)and the interfacial bonding in CFRC,the reinforcement mechanism of the GO-modified CFRC was analyzed by combining interaction energy and radial distribution function.Results indi-cate that GO-modified carbon fiber exhibits increased roughness and a lower contact angle,suggesting that GO is beneficial for en-hancing the compatibility and mechanical interlocking between CF and calcium silicate hydrate(C-S-H).When the pull-out speed is 1 m/s,the interfacial shear strength of C-S-H/GO@CF is improved by at least 337%compared to that of C-S-H/CF,which is at-tributed to the significant enhancement of Coulombic interactions at the interface that transforms the failure mode from weak to strong.Moreover,GO can form both chemical bonds and hydrogen bonds with C-S-H,thereby further reinforcing the interfacial bonding strength.
Keywords：carbon fibergraphene oxideinterfacial bondingtoughening mechanismmolecular dynamics
Publication Date：2025-09-25
Online Publishing Date：2025-10-15(First online date of this platform, not the publication date of the document)
Pages：6( 37-42 )