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Case Studies of Concrete Repair and Strengthening of Coal Storage Silos in Eastern Australia

机译：澳大利亚东部混凝土修复和储煤筒仓加固的案例研究

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Two 3000-ton capacity reinforced concrete coal silos and one 5000-ton capacity reinforced concretecoal silo in the Hunter Valley, New South Wales, Australia were deteriorated due to corrosion of steelreinforcement. The storage silos are a critical asset necessary to facilitate the efficient delivery of coal.Serious concrete deterioration of the silos and corrosion to external post-tensioned cables had thepotential to catastrophically interrupt the supply chain. A risk and structural assessment of the siloswas undertaken and a condition investigation completed.A remedial option scenario analysis was conducted for each silo to provide a serviceable strengtheningsolution.The remedial solutions ultimately adopted used either carbon fiber laminates (CFL) and/or posttensioned cables, all externally applied. In both cases where delaminated (drummy) zones of concretewere present or where concrete had severely spalled (internally and externally) concrete repair wasundertaken with a sprayed repair mortar. An elastomeric anti-carbonation coating system was thenapplied to external silo concrete surfaces.
机译：由于钢筋的腐蚀，澳大利亚新南威尔士州亨特谷的两个3000吨增强型混凝土煤仓和一个5000吨增强型混凝土煤仓被破坏了。储存筒仓是促进煤炭高效输送所必需的重要资产。筒仓的严重混凝土恶化和对外部后张紧电缆的腐蚀都有可能严重破坏供应链。进行了筒仓的风险和结构评估并完成了条件调查。对每个筒仓进行了补救方案分析，以提供可使用的加固解决方案。最终采用的补救方案是使用碳纤维层压板（CFL）和/或后张拉电缆，所有外部应用。在两种情况下，都存在混凝土的分层（淤泥）区域或混凝土严重（内部和外部）剥落的情况，使用喷洒的修补砂浆对混凝土进行修补。然后将弹性体抗碳化涂料系统应用于筒仓混凝土外表面。

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