Anti-corrosive superhydrophobic coatings for reinforcement protection: recycling of concrete garbage

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Anti-corrosion Methods and Materials Pub Date : 2024-05-28 DOI:10.1108/acmm-12-2023-2939

Xiaohu Wen, Xiangkang Cao, Xiao-ze Ma, Zefan Zhang, Zehua Dong

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Abstract

Purpose

The purpose of this paper was to prepare a ternary hierarchical rough particle to accelerate the anti-corrosive design for coastal concrete infrastructures.

Design/methodology/approach

A kind of micro-nano hydrophobic ternary microparticles was fabricated from SiO₂/halloysite nanotubes (HNTs) and recycled concrete powders (RCPs), which was then mixed with sodium silicate and silane to form an inorganic slurry. The slurry was further sprayed on the concrete surface to construct a superhydrophobic coating (SHC). Transmission electron microscopy and energy-dispersive X-ray spectroscopy mappings demonstrate that the nano-sized SiO₂ has been grafted on the sub-micron HNTs and then further adhered to the surface of micro-sized RCP, forming a kind of superhydrophobic particles (SiO₂/HNTs@RCP) featured of abundant micro-nano hierarchical structures.

Findings

The SHC surface presents excellent superhydrophobicity with the water contact angle >156°. Electrochemical tests indicate that the corrosion rate of mild steel rebar in coated concrete reduces three-order magnitudes relative to the uncoated one in 3.5% NaCl solution. Water uptake and chloride ion (Cl^-) diffusion tests show that the SHC exhibits high H₂O and Cl^- ions barrier properties thanks to the pore-sealing and water-repellence properties of SiO₂/HNTs@RCP particles. Furthermore, the SHC possesses considerable mechanical durability and outstanding self-cleaning ability.

Originality/value

SHC inhibits water uptake, Cl^- diffusion and rebar corrosion of concrete, which will promote the sustainable application of concrete waste in anti-corrosive concrete projects.

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用于保护钢筋的抗腐蚀超疏水涂层：混凝土垃圾的回收利用

本文旨在制备一种三元分层粗糙颗粒，以加速沿海混凝土基础设施的防腐蚀设计。设计/方法/方法利用 SiO2/海泡石纳米管（HNTs）和再生混凝土粉（RCPs）制备了一种微纳米憎水三元微颗粒，然后与硅酸钠和硅烷混合形成无机浆料。然后将浆料喷涂在混凝土表面，形成超疏水涂层（SHC）。透射电子显微镜和能量色散 X 射线光谱图表明，纳米级的 SiO2 接枝到亚微米级的 HNTs 上，然后进一步粘附到微米级的 RCP 表面，形成了一种具有丰富微纳米分层结构的超疏水颗粒（SiO2/HNTs@RCP）。电化学测试表明，在 3.5% 的 NaCl 溶液中，涂层混凝土中低碳钢筋的腐蚀速率比未涂层混凝土降低了三个数量级。吸水和氯离子（Cl-）扩散测试表明，由于 SiO2/HNTs@RCP 颗粒的孔隙密封和憎水特性，SHC 具有很高的 H2O 和 Cl- 离子阻隔性能。原创性/价值SHC 可抑制混凝土的吸水、Cl- 扩散和钢筋锈蚀，这将促进混凝土废料在防腐混凝土工程中的可持续应用。

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来源期刊

Anti-corrosion Methods and Materials 工程技术-冶金工程

CiteScore

2.80

自引率

16.70%

发文量

审稿时长

13.5 months

期刊介绍： Anti-Corrosion Methods and Materials publishes a broad coverage of the materials and techniques employed in corrosion prevention. Coverage is essentially of a practical nature and designed to be of material benefit to those working in the field. Proven applications are covered together with company news and new product information. Anti-Corrosion Methods and Materials now also includes research articles that reflect the most interesting and strategically important research and development activities from around the world. Every year, industry pays a massive and rising cost for its corrosion problems. Research and development into new materials, processes and initiatives to combat this loss is increasing, and new findings are constantly coming to light which can help to beat corrosion problems throughout industry. This journal uniquely focuses on these exciting developments to make essential reading for anyone aiming to regain profits lost through corrosion difficulties. • New methods, materials and software • New developments in research and industry • Stainless steels • Protection of structural steelwork • Industry update, conference news, dates and events • Environmental issues • Health & safety, including EC regulations • Corrosion monitoring and plant health assessment • The latest equipment and processes • Corrosion cost and corrosion risk management.