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<p>The beachrock distributed around tropical islands is rapidly degrading due to the impacts of storm surges and human activities. Magnesium oxychloride cement (MOC), with its advantages such as high strength, resistance to salt brine, and environmental friendliness, is a promising green restoration material for island construction and coastal protection. In this study, a MOC-based artificial beachrock material was developed using South China Sea sand as the aggregate combined with MOC, intended for the repair of damaged natural beachrock and the construction of artificial beachrock along coastlines. The degradation behavior and mechanisms of the artificial beachrock in a humid beach environment were investigated through tests including unconfined compressive strength (UCS), scanning electron microscopy (SEM), x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and mercury intrusion porosimetry (MIP). The results indicate that the hydration process of the outdoor specimens was impeded in the humid beach environment, preventing the formation of strength-contributing crystalline phases (Phase 5). The evolution of the pore structure, which exacerbated water erosion, was identified as the primary cause of performance degradation. This study offers a novel potential approach for the rapid restoration of beachrock on tropical islands and the stabilization of coastlines.</p>

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Magnesium Oxychloride Cement-Based Artificial Beachrock for the Restoration Island Reefs: Performance Evaluation and Application Strategies

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Yuanrui Li,
  • Jinmei Dong,
  • Jianjun Qu,
  • Jin Zhou,
  • Weixin Zheng

摘要

The beachrock distributed around tropical islands is rapidly degrading due to the impacts of storm surges and human activities. Magnesium oxychloride cement (MOC), with its advantages such as high strength, resistance to salt brine, and environmental friendliness, is a promising green restoration material for island construction and coastal protection. In this study, a MOC-based artificial beachrock material was developed using South China Sea sand as the aggregate combined with MOC, intended for the repair of damaged natural beachrock and the construction of artificial beachrock along coastlines. The degradation behavior and mechanisms of the artificial beachrock in a humid beach environment were investigated through tests including unconfined compressive strength (UCS), scanning electron microscopy (SEM), x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and mercury intrusion porosimetry (MIP). The results indicate that the hydration process of the outdoor specimens was impeded in the humid beach environment, preventing the formation of strength-contributing crystalline phases (Phase 5). The evolution of the pore structure, which exacerbated water erosion, was identified as the primary cause of performance degradation. This study offers a novel potential approach for the rapid restoration of beachrock on tropical islands and the stabilization of coastlines.