Developing an innovative hydrophobic/breathable functionalized graphene-based coating for controlling the chloride-induced corrosion of rebar in concrete structures

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-10 DOI:10.1016/j.conbuildmat.2025.140662

Mahmood Shariatmadar, Mohammad Mahdavian, Bahram Ramezanzadeh

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引用次数: 0

Abstract

This study introduces the innovative use of a thin graphene-based film designed to enhance resistance against chloride-induced corrosion while maintaining the breathability of concrete. In this study, the graphene oxide (GO) was modified through a two-step procedure, first involving a reaction with (3-aminopropyl)triethoxysilane (GO-A) and then with epoxy silicone (GO-AE). The GO-AE dispersion was applied to the concrete substrate (700 ± 150 nm), creating a hydrophobic surface with a 108° contact angle, low water capillary absorption (103 g.m⁻².day⁻¹), and 45 % breathability. The electrochemical test results revealed a low corrosion current density (8 ×10⁻⁸ A.cm⁻²) and high concrete resistance (162 kΩ.cm²) in the presence of the GO-AE protective film after 120 days of submersion in the saline solution, improving by 4 and 3 orders of magnitude over uncoated concrete. Additionally, after 25 freeze-thaw cycles and 200 h of QUV irradiation, the GO-AE-coated concretes showed slight changes in WCA (409 g/m²/day) and breathability (56 %).

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本研究介绍了一种基于石墨烯的薄膜的创新应用，这种薄膜旨在增强混凝土的抗氯化物腐蚀能力，同时保持其透气性。在这项研究中，氧化石墨烯 (GO) 通过两步程序进行改性，首先与（3-氨丙基）三乙氧基硅烷（GO-A）反应，然后与环氧硅氧烷（GO-AE）反应。将 GO-AE 分散液涂在混凝土基底（700 ± 150 nm）上，形成一个接触角为 108°、毛细吸水率低（103 g.m-2.day-1）和透气性为 45% 的疏水表面。电化学测试结果表明，在盐溶液中浸泡 120 天后，有 GO-AE 保护膜存在的混凝土腐蚀电流密度低（8 ×10-8 A.cm-2），混凝土电阻高（162 kΩ.cm2），比未涂膜的混凝土分别提高了 4 个和 3 个数量级。此外，经过 25 次冻融循环和 200 小时的 QUV 照射后，GO-AE 涂层混凝土的 WCA（409 克/平方米/天）和透气性（56%）略有变化。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.