Abstract In this work, the influence of sodium nitrite (NaNO2) and sodium nitrate (NaNO3) corrosion inhibitors on the composition, structure, and chloride binding behaviors of layered double hydroxides (LDHs) formed in ternary ordinary Portland cement-metakaolin-dolomite (OPC-MK-DM) systems is studied. The results show that the nitrite and nitrate anions are preferably intercalated in the Ca Al LDHs (AFm phases), but not in the Mg Al LDHs (hydrotalcite-type phases) due to its limited formation in these ternary cementitious systems cured at ambient temperature. The autogenously formed nitrate- and nitrite-AFm phases are decomposed upon chloride exposure accompanied by Friedel's salts formation, potentially releasing corrosion inhibitive ions to the pore solution in a progressive manner. The NaNO2 and NaNO3 incorporation in ternary OPC-MK-DM binders marginally lowers chloride binding capacity but reduces its penetration resistance mainly due to pore coarsening. Nevertheless, a strong linear correlation can be established between the water-soluble and total chloride contents in ternary OPC-MK-DM systems, regardless of OPC replacement level and corrosion inhibitor incorporation.

中文翻译：

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波特兰水泥-偏高岭土-白云石混合物中亚硝酸盐和硝酸盐插层层状双氢氧化物 (LDH) 的自生形成和智能行为

摘要 在这项工作中，亚硝酸钠 (NaNO2) 和硝酸钠 (NaNO3) 缓蚀剂对普通硅酸盐水泥-偏高岭土-白云石 (OPC) 中形成的层状双氢氧化物 (LDH) 的组成、结构和氯化物结合行为的影响。 -MK-DM) 系统进行了研究。结果表明，亚硝酸根和硝酸根阴离子优选插入 Ca Al LDHs（AFm 相）中，而不插入 Mg Al LDHs（水滑石型相）中，因为其在这些在环境温度下固化的三元胶结体系中的形成有限。自生形成的硝酸盐和亚硝酸盐 AFm 相在氯化物暴露时分解，伴随着弗里德尔盐的形成，潜在地以渐进的方式向孔隙溶液释放腐蚀抑制离子。在三元 OPC-MK-DM 粘合剂中加入 NaNO2 和 NaNO3 会略微降低氯化物结合能力，但主要由于孔隙粗化而降低其渗透阻力。尽管如此，在三元 OPC-MK-DM 系统中，水溶性和总氯化物含量之间可以建立很强的线性相关性，而不管 OPC 替代水平和缓蚀剂掺入如何。