Influence of graphene on calcium leaching in fibre reinforced cementitious mixes under impressed current cathodic protection

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-07-09 DOI:10.1016/j.cemconcomp.2025.106226

Nguyen Tien Dung , Meini Su , Yong Wang , Cise Unluer

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引用次数: 0

Abstract

Anode acidification at the fibre/mortar interface challenges the durability of Fibre-Reinforced Cementitious Matrix (FRCM) composites in Impressed Current Cathodic Protection (ICCP) systems. This study examined the addition of 0.035–0.07 % graphene to FRCM composites, focusing on its role in phase formation, calcium leaching mitigation, and structural performance under electrochemical conditions. Graphene enhanced the formation of portlandite and C-S-H, densified the microstructure, and improved electrical conductivity, leading to reduced degradation and more uniform ion redistribution. Under current densities of 0.05–0.5 A/m², graphene promoted the dissolution of unhydrated cement, rather than hydrated cement products, facilitating a continuous flow of cations and electrons. Thus, graphene-incorporated specimens exhibited delayed failure points and doubled the service life compared to controls. These findings demonstrated graphene's potential to reduce maintenance needs and material usage by up to 50 %, offering significant economic savings and sustainability benefits for ICCP systems.

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外加电流阴极保护下石墨烯对纤维增强胶凝料中钙浸出的影响

在外加电流阴极保护（ICCP）系统中，纤维/砂浆界面的阳极酸化对纤维增强胶凝基质（FRCM）复合材料的耐久性提出了挑战。本研究考察了在FRCM复合材料中添加0.035-0.07%的石墨烯，重点研究了其在电化学条件下对相形成、钙浸出减缓和结构性能的作用。石墨烯增强了硅酸盐和C-S-H的形成，致密化了微观结构，提高了电导率，导致降解减少，离子再分布更加均匀。在0.05 ~ 0.5 A/m2的电流密度下，石墨烯促进了未水化水泥的溶解，而不是水化水泥产品的溶解，促进了阳离子和电子的连续流动。因此，与对照组相比，石墨烯掺入的样品显示出延迟的失效点和两倍的使用寿命。这些发现表明，石墨烯有可能减少高达50%的维护需求和材料使用，为ICCP系统提供显著的经济节约和可持续性效益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.