Failure mechanism on sulfate attack and dissolved corrosion of diseased tunnel lining structure

Jinwang Mao, N. Liang, Ruhao Yan
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Abstract

To study the corrosion failure mechanism of tunnel lining structure subjected to sulfate attack and dissolved corrosion, site investigation was carried out on a diseased tunnel in Chongqing. The corrosion products were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The results showed that the tunnel lining structure had been exposed to groundwater containing substantial concentrations of salts (SO42-, HCO3-, et al.) for many years, resulted that the concrete strength was lower than its design value. The formation of thaumasite made concrete lose its strength completely. Concrete structure would be destroyed when crystallization pressure exceeded the tensile strength of concrete. The tunnel also appeared dissolved corrosion which made the cement stone density and concrete strength reduce.
病害隧道衬砌结构硫酸盐侵蚀及溶解腐蚀破坏机理
为研究隧道衬砌结构在硫酸盐侵蚀和溶解腐蚀作用下的腐蚀破坏机理,对重庆某病害隧道进行了现场调查。采用扫描电子显微镜(SEM)、能谱仪(EDS)、x射线衍射仪(XRD)和傅里叶变换红外光谱仪(FTIR)对腐蚀产物进行分析。结果表明,隧道衬砌结构长期暴露于含大量盐分(SO42-、HCO3-等)的地下水中,导致混凝土强度低于设计值。膨润土的形成使混凝土完全失去强度。当结晶压力超过混凝土抗拉强度时,混凝土结构将受到破坏。隧道还出现溶解腐蚀,使水泥石密度降低,混凝土强度降低。
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