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Concrete sewer pipe corrosion induced by sulphuric acid environment

机译:硫酸环境引起的混凝土下水道管道腐蚀

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摘要

Corrosion of concrete sewer pipes induced by sulphuric acid attack is a recognised problem worldwide, which is not only an attribute of countries with hot climate conditions as thought before. The significance of this problem is by far only realised when the pipe collapses causing surface flooding and other severe consequences. To change the existing post-reactive attitude of managing companies, easy to use and robust models are required to be developed which currently lack reliable data to be correctly calibrated. This paper focuses on laboratory experiments of establishing concrete pipe corrosion rate by submerging samples in to 0.5 pH sulphuric acid solution for 56 days under 10ºC, 20ºC and 30ºC temperature regimes. The result showed that at very early stage of the corrosion process the samples gained overall mass, at 30ºC the corrosion progressed quicker than for other temperature regimes, however with time the corrosion level for 10ºC and 20ºC regimes tended towards those at 30ºC. Overall, at these conditions the corrosion rates of 10 mm/year, 13,5 mm/year and 17 mm/year were observed.
机译:硫酸侵蚀引起的混凝土下水道的腐蚀已成为世界公认的问题,这不仅是气候条件恶劣的国家以前认为的问题。到目前为止,只有在管道塌陷导致表面溢流和其他严重后果时,才意识到此问题的重要性。为了改变管理公司现有的事后反应态度,需要开发易于使用且健壮的模型,这些模型目前缺乏可靠的数据以进行正确校准。本文着重于通过在10ºC,20ºC和30ºC温度下将样品浸入0.5 pH的硫酸溶液中56天来确定混凝土管道腐蚀速率的实验室实验。结果表明,在腐蚀过程的非常早期阶段,样品的总质量就增加了,在30ºC时,腐蚀的进展比其他温度方案更快,但是随着时间的推移,10ºC和20ºC方案的腐蚀水平趋向于30ºC的腐蚀水平。总体而言,在这些条件下,观察到的腐蚀速率为10毫米/年,13.5毫米/年和17毫米/年。

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