Durability assessment of MgO/hydromagnesite mortars—Resistance to chlorides and corrosion

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Fabio Enrico Furcas, Alexander German, Frank Winnefeld, Pietro Lura, Ueli Angst
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引用次数: 0

Abstract

The durability of MgO/hydromagnesite mortars was studied with respect to their corrosion performance and resistance to chloride attack and moisture. Rapid chloride ingress measurements showed chloride migration coefficients of \({D}_{\text{Cl}}={1\times 10}^{-13}\) to \({1\times 10}^{-12}\) \({\text{m}}^{2}/{\text{s}}\). MgO/hydromagnesite pastes were cured in alkaline chloride solution to investigate the formation of Mg-chlorides; however, no such phases were observed. The corrosion rate of carbon steel embedded in MgO/HY mortars, as determined by linear polarization resistance measurements, was in the range \({i}_{\text{corr}}=1\times {10}^{-9}\) \(\text{A/}{\text{cm}}^{2}\) in dry and \(1\times {10}^{-7}\) \(\text{A/}{\text{cm}}^{2}\) in wet conditions, irrespective of the mortar composition or curing condition. These findings corroborate the hypothesis that, in the absence of chlorides, the moisture condition is the primary predictor of corrosion rate of carbon steel in the MgO/hydromagnesite binder. These accelerated, short-term experiments suggest that the binder may be suited to protect embedded carbon steel from corrosion under specific exposure conditions of practical relevance.

氧化镁/氢镁砂砂浆的耐久性评价——抗氯化物和耐腐蚀性能
研究了氧化镁/氢菱镁砂浆的耐腐蚀性能、抗氯侵蚀性能和耐湿气性能。快速氯化物进入测量显示了\({D}_{\text{Cl}}={1\times 10}^{-13}\)到\({1\times 10}^{-12}\)\({\text{m}}^{2}/{\text{s}}\)的氯化物迁移系数。在碱性氯化物溶液中对镁氧化镁/氢菱镁矿膏体进行了固化,研究了镁氯化物的形成;然而,没有观察到这样的阶段。线性极化电阻测量结果表明,无论砂浆成分或养护条件如何,MgO/HY砂浆中碳钢的腐蚀速率在干燥和潮湿条件下分别为\({i}_{\text{corr}}=1\times {10}^{-9}\)\(\text{A/}{\text{cm}}^{2}\)和\(1\times {10}^{-7}\)\(\text{A/}{\text{cm}}^{2}\)。这些发现证实了假设,即在没有氯化物的情况下,水分条件是MgO/氢菱镁矿粘结剂中碳钢腐蚀速率的主要预测因素。这些加速的短期实验表明,在实际相关的特定暴露条件下,粘合剂可能适合保护嵌入的碳钢免受腐蚀。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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