Chloride-induced corrosion of galvanized steel in ordinary Portland cement and alkali-activated fly ash mortars with benzotriazole

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-05-10 DOI:10.1016/j.cemconcomp.2025.106117

Jinjie Shi , Xiangdong Guan

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Abstract

Galvanized steel can be passivated in ordinary Portland cement (OPC) due to the formation of a protective calcium hydroxyzincate (CHZ) layer. However, it is rarely concerned about the corrosion resistance of galvanized steel in alkali-activated fly ash (AAFA). Accordingly, this study evaluated the passivation performance and chloride-induced corrosion behavior of galvanized steel in OPC and AAFA mortars, and the impact of benzotriazole (BTA) on the corrosion resistance of galvanized steel was also investigated. The results demonstrated that, unlike OPC mortar, AAFA mortar failed to provide effective protection for galvanized steel due to the inability to form a stable CHZ protective layer. This phenomenon primarily results from the rapid dissolution of the galvanized coating by the alkali activator during the early hydration stage, combined with the lack of adequate calcium ions in the highly alkaline pore solutions. Moreover, BTA enhanced the corrosion resistance of galvanized steel in OPC mortar, whereas it exhibited no inhibition effect in AAFA mortar. These findings could enhance our understanding towards the design of novel low-carbon and high-durable concrete structures.

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镀锌钢在普通硅酸盐水泥和含苯并三唑碱活化粉煤灰砂浆中的氯致腐蚀

镀锌钢在普通硅酸盐水泥（OPC）中可以钝化，因为形成了保护性的羟基锌酸钙（CHZ）层。然而，人们对镀锌钢在碱活性粉煤灰（AAFA）中的耐蚀性却很少关注。因此，本研究评估了镀锌钢在OPC和AAFA砂浆中的钝化性能和氯化物诱导腐蚀行为，并研究了苯并三唑（BTA）对镀锌钢耐腐蚀性的影响。结果表明，与OPC砂浆不同，AAFA砂浆由于无法形成稳定的CHZ保护层而无法对镀锌钢提供有效的保护。这种现象主要是由于在早期水化阶段，碱性活化剂对镀锌层的快速溶解，加上高碱性孔隙溶液中缺乏足够的钙离子。此外，BTA在OPC砂浆中增强了镀锌钢的耐蚀性，而在AAFA砂浆中没有抑制作用。这些发现可以增强我们对新型低碳、高耐用混凝土结构设计的理解。

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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.