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How crystalline waterproofing admixtures combat corrosion

机译:结晶防水剂如何抵抗腐蚀

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摘要

Water movement through the concrete allows waterborne chlorides to penetrate reinforcing steel and causes corrosion, resulting in expansive pressure and cracking. Once cracking has started, water movement increases and the rate of deterioration increases leading to a drastically shortened lifespan. The problem is that concrete on its own is not waterproof. Concrete is filled with interconnected capillary pores that allow the concrete to 'breathe', but also allow water to pass through. Due to concrete's high pH level, it is typically good at protecting reinforcement. The steel reinforcing bars are passivated by an iron oxide film that protects the steel. However, the passive layer can break down over time due to atmospheric carbon dioxide, which through carbonation, lowers the pH of the concrete until the passive layer becomes unstable. The passive layer can also be rapidly broken down by aggressive chemicals such as chloride brought in by water. Once the passive layer is compromised, reinforced steel will begin to corrode if there is moisture and oxygen present at the surface of the steel.
机译:穿过混凝土的水分运动使水性氯化物渗透到钢筋中并引起腐蚀,从而导致膨胀压力和开裂。一旦开始破裂,水的流动就会增加,劣化的速度也会加快,从而导致使用寿命大大缩短。问题在于混凝土本身不能防水。混凝土中充满了相互连接的毛细孔,这些毛孔可以使混凝土“呼吸”,但也可以让水通过。由于混凝土的高pH值,它通常可以很好地保护钢筋。钢筋由保护钢的氧化铁膜钝化。但是,由于大气中的二氧化碳,钝化层会随时间推移而分解,而二氧化碳会通过碳化作用降低混凝土的pH值,直到钝化层变得不稳定为止。钝化层也可以被侵蚀性化学物质(例如水引入的氯化物)迅速破坏。一旦钝化层受损,如果钢表面上存在湿气和氧气,钢筋将开始腐蚀。

著录项

  • 来源
    《Concrete》 |2017年第5期|27-29|共3页
  • 作者

    Alireza Biparva;

  • 作者单位
  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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