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首页> 外文期刊>ACI Materials Journal >Chloride Ion Penetration in Reinforced Concrete and Steel Fiber-Reinforced Concrete Precast Tunnel Lining Segments
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Chloride Ion Penetration in Reinforced Concrete and Steel Fiber-Reinforced Concrete Precast Tunnel Lining Segments

机译：钢筋混凝土和钢纤维混凝土预制隧道衬砌板块中的氯离子渗透

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摘要

Steel corrosion induces distress in concrete structures, resulting in the cracking and spoiling of the concrete cover, which accelerates further damage. Chloride ions (Cl) and carbonation are the primary causes of steel corrosion in concrete. This study investigates the effects of Ct in precast concrete tunnel lining (PCTL) segments through conducting various tests on cylindrical cores extracted from conventional reinforced concrete (RC) and steel fiber-reinforced concrete (SFRC) segments. The full-scale PCTL segments were fabricated and cured at an industrial precast plant. Experimental results show that the external specimens (extrados and intrados faces) of both the RC and SFRC PCTL segments exhibited lower Ct penetration due to surface treatment using a cement slurry. The Cl diffusion coefficient was a function of the exposure period and concentration of the salt solution for both the RC and SFRC segments. SFRC PCTL segments better resisted the ingress of Cl than control RC segments due to a barrier effect induced by steel fibers (SF), which helped inhibiting the penetration of Ct into the hardened concrete. This study demonstrates the potential of SFRC as a more durable alternative for precast segmental tunnel linings compared to conventional RC.
机译：钢腐蚀会引起混凝土结构的损坏，导致混凝土表层开裂和变质，从而进一步加速损坏。氯离子（Cl）和碳化是混凝土中钢腐蚀的主要原因。本研究通过对从常规钢筋混凝土（RC）和钢纤维增强混凝土（SFRC）管段中提取的圆柱芯进行各种测试，研究了Ct在预制混凝土隧道衬砌（PCTL）管段中的影响。完整的PCTL段是在工业预制厂制造和固化的。实验结果表明，由于使用水泥浆液进行了表面处理，RC和SFRC PCTL段的外部标本（ext外和内齿面）均显示出较低的Ct渗透率。 Cl扩散系数是RC和SFRC链段的暴露时间和盐溶液浓度的函数。由于钢纤维（SF）引起的阻挡作用，SFRC PCTL段比对照RC段更好地抵抗了Cl的侵入，这有助于抑制Ct渗透到硬化混凝土中。这项研究表明，与传统的RC相比，SFRC作为预制分段式隧道衬砌的更耐用替代品的潜力。

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