污水隧道衬砌的双重防腐

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2021-06-24 DOI:10.1080/14488353.2021.1941597
Keith W. K. Kong
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引用次数: 0

摘要

在下水道环境中,污水产生的气体硫化氢与好氧饲养微生物之间发生了复杂的化学和微生物过程。由此产生的硫酸会对水泥基混凝土结构造成长期腐蚀。这种腐蚀过程被称为“微生物影响腐蚀”。一般来说,普通硅酸盐水泥基混凝土不被认为是直接暴露在酸性下水道环境中的合适材料。因此,有必要防止侵略性环境的发展,以及防止腐蚀性环境与混凝土元件接触。必须为隧道和地下结构指定并提供强大的腐蚀保护系统,以确保这些结构在恶劣的下水道环境下的耐久性,并能够承受100年的设计寿命。实例分析了基于现有技术的7种行之有效的防腐衬里系统。本文提供了以往隧道的经验,并对这七个衬砌系统的成本效益和数量分析进行了进一步的探索性研究。提出了硅酸盐水泥基抗微生物影响腐蚀混凝土的技术规范。
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Double corrosion protection of sewage tunnel linings
ABSTRACT In sewer environments, there are complex chemical and microbiological processes with a reaction between the hydrogen sulphide, a gas produced by the used water, and aerobic feeding microorganism. This resulted in production of sulphuric acid which would cause long-term corrosion on cement based concrete structures. This corrosion process is known as “Microbiologically Influenced Corrosion“. Generally, the ordinary Portland cement-based concrete is not considered as a suitable material for direct exposure to acidic sewer environments. As such, it is necessary to prevent the aggressive environments from developing, as well as to prevent the corrosive environments from coming in contact with the concrete elements. A robust corrosion protection system must be specified and provided for the tunnels and underground structures to ensure the durability of these structures under the aggressive sewer environments and able to withstand a design life span of 100 years. Case example with discussion on seven proven corrosion protection lining systems based on current technology. Past experience of the tunnels is provided with further exploratory study in terms of cost effectiveness and quantity analysis for these seven lining systems to be investigated. A technical specification for Portland cement–based Microbiologically Influenced Corrosion resistant concrete is provided.
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来源期刊
CiteScore
3.90
自引率
7.70%
发文量
31
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