双层状氢氧化物（LDH）在混凝土中的应用：综述

亚历 山大, 米哈 伊尔, 丹尼 尔·, 扎希 德·
葡萄牙材料研究所

摘要

钢筋混凝土氯化物腐蚀问题是影响全球基础设施并造成巨大经济损失的严重问题。因此，这个问题最近在
科学界引起了相当大的关注。双层状氢氧化物（LDH）最近作为一种新型混凝土添加剂出现，具有提高混凝土抗氯
化物和减轻腐蚀的潜力。LDH是粘土状结构，由带正电的阳离子层和缔合的氢氧化物和层间的可交换阴离子组成。
由于这种电荷平衡结构，LDHs具有从环境中封装阴离子并将其替换为存在于其层中的可交换阴离子的特性。潜在的
应用包括混凝土中的氯化物截留和缓蚀阴离子的输送。然而，许多用途广泛的 LDH组合物可以很容易地合成，并且
它们作为水泥添加剂的应用远远超出了混凝土中的缓蚀范围。本综述总结了 LDH在混凝土中应用的最新进展。对最
近发表的大量文献进行了严格审查，并确定了趋势。

关键词

双层状氢氧化物；加强；离子交换；腐蚀；混凝土

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