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<p>This study systematically examines the combined corrosion caused by chloride, sulfate, and magnesium ions in alkali-activated slag concrete (AASC) under the influence of both load and dissolution. The results indicate that the load and dissolution facilitated ion diffusion into the AASC. The promoting effect of dissolution on sulfate ions was greater than that on chloride ions. With an increase in the load level, the promoting effect of sulfate ions was greater than that of chloride ions at the early stage of corrosion, whereas the promoting effect of sulfate ions was less than that of chloride ions at the late stage of corrosion. As the corrosion progressed, the pH of the pore solution decreased, leading to the reduced stability of Friedel’s salt and Ettringite. The desorption of chloride and sulfate ions from the corrosion products enhanced the transport of these ions in the AASC. The inhibitory effect of the dense brucite (magnesium hydroxide) layer on chloride and sulfate ion transport decreased as the exposure age increased. The cohesionless magnesium silicate hydrate (M-S-H) formed by magnesium ions and calcium silicate hydrate (C-S-H) disrupts the AASC structure, enhancing the movement of chloride and sulfate ions.</p>

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Unmasking the attack behaviour of composite chloride ions, sulfate ions, and magnesium ions in alkali-activated slag concrete subjected to load damage and dissolution

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Qiang Fu,
  • Yingkun Xue,
  • Yuanyao Miao,
  • Zhaorui Zhang,
  • Yongliang Han,
  • Ditao Niu

摘要

This study systematically examines the combined corrosion caused by chloride, sulfate, and magnesium ions in alkali-activated slag concrete (AASC) under the influence of both load and dissolution. The results indicate that the load and dissolution facilitated ion diffusion into the AASC. The promoting effect of dissolution on sulfate ions was greater than that on chloride ions. With an increase in the load level, the promoting effect of sulfate ions was greater than that of chloride ions at the early stage of corrosion, whereas the promoting effect of sulfate ions was less than that of chloride ions at the late stage of corrosion. As the corrosion progressed, the pH of the pore solution decreased, leading to the reduced stability of Friedel’s salt and Ettringite. The desorption of chloride and sulfate ions from the corrosion products enhanced the transport of these ions in the AASC. The inhibitory effect of the dense brucite (magnesium hydroxide) layer on chloride and sulfate ion transport decreased as the exposure age increased. The cohesionless magnesium silicate hydrate (M-S-H) formed by magnesium ions and calcium silicate hydrate (C-S-H) disrupts the AASC structure, enhancing the movement of chloride and sulfate ions.