Insights into the Mechanism of Graphene Acting on Water and Chloride Ion Permeability of Cement-Based Materials

Author:

Dong Jianmiao1,Zhuang Jiaqiao2,Li Wanjin1,Zou Mingxuan1,He Qi1,Luo Shuqiong3ORCID

Affiliation:

1. School of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China

2. College of Biological & Environmental Sciences, Zhejiang Wanli University, Ningbo 315000, China

3. Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Abstract

Due to its excellent mechanical properties and high aspect ratio, graphene can significantly improve the water and chloride ion permeability resistance of cementitious materials. However, few studies have investigated the effect of graphene size on the water and chloride ion permeability resistance of cementitious materials. The main issues are as follows: How do different sizes of graphene affect the water and chloride ion permeability resistance of cement-based materials, and by what means do they affect these properties? To address these issues, in this paper, two different sizes of graphene were used to prepare graphene dispersion, which was then mixed with cement to make graphene-reinforced cement-based materials. The permeability and microstructure of samples were investigated. Results show that the addition of graphene effectively improved both the water and chloride ion permeability resistance of cement-based materials significantly. The SEM (scanning electron microscope) images and XRD (X-ray diffraction) analysis show that the introduction of either type of graphene could effectively regulate the crystal size and morphology of hydration products and reduce the crystal size and the number of needle-like and rod-like hydration products. The main types of hydrated products are calcium hydroxide, ettringite, etc. The template effect of large-size graphene was more obvious, and a large number of regular flower-like cluster hydration products were formed, which made the structure of cement paste more compact and thus significantly improved the resistance to the penetration of water and chloride ions into the matrix of the concrete.

Funder

National Natural Science Foundation of China

Guangxi Graduate Education Innovation Program Project

Key Public Welfare Special Project of Henan Province

Henan Outstanding Foreign Scientists’ Workroom

ingbo Science and Technology Innovation 2025 Key Project

Publisher

MDPI AG

Subject

General Materials Science

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