ABSTRACT Parameters characterising the properties of soils used as backfill in immediate contact with cast iron pipes exhumed from a variety of soils after up to 129 years exposure are used together with average annual precipitation to estimate the average time of wetness. This is shown to correlate closely with pipe wall corrosion penetration. The possibility of microbiologically influenced corrosion is dismissed owing to lack of critical nutrients. The presence of chlorides in some soils most likely arises from pipe wall corrosion penetration and subsequent leakage of chlorinated drinking water. The predictions from the derived model are compared with an independent set of 16 pipe-wall corrosion penetration observations for pipes with up to 98 years exposures and found to agree well. The potential influences of soil temperature, physical damage and poor quality backfill are discussed.

中文翻译：

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基于湿度时间的回填土铸铁管长期局部腐蚀的发展

摘要 表征用作回填土的土壤特性的参数与从各种土壤中挖掘出的铸铁管直接接触长达 129 年，并与平均年降水量一起使用，以估计潮湿的平均时间。这被证明与管壁腐蚀渗透密切相关。由于缺乏关键营养素，微生物影响腐蚀的可能性被排除在外。某些土壤中氯化物的存在很可能是由于管壁腐蚀渗透和氯化饮用水随后泄漏造成的。将派生模型的预测与暴露于长达 98 年的管道的一组独立的 16 次管壁腐蚀渗透观察进行比较，结果一致。土壤温度的潜在影响，