Cost effectiveness of reinforcement alternatives for a concrete water chlorination tank
Cost effectiveness of reinforcement alternatives for a concrete water chlorination tank
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DOI：
10.1016/j.jobe.2019.100992
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发表时间：
2020
影响因子：
6.4
通讯作者：
A. Younis;U. Ebead;P. Suraneni;A. Nanni
中科院分区：
文献类型：
--
作者：
A. Younis;U. Ebead;P. Suraneni;A. Nanni
水/废水处理厂的钢筋混凝土水池由于使用某些处理化学品和方法而产生的侵蚀性暴露条件，容易受到严重腐蚀。不锈钢或纤维增强聚合物(FRP)等非腐蚀性材料可能是此类混凝土结构的有吸引力的替代加固选择。然而，这种材料的高初始成本限制了它们的使用，尽管这种想法忽视了混凝土长期耐久性的改善。本文采用寿命周期成本分析方法(LCCA)对混凝土水氯化水池中非腐蚀性钢筋的使用进行了研究，旨在评估不同钢筋替代品的成本效益。对黑钢、环氧涂层钢、不锈钢和玻璃钢(GFRP)四种混凝土加固材料进行了100年的分析比较，结果表明，使用非腐蚀钢筋有助于实现相当大的长期成本节约。LCCA分析表明，经过35年的建设，玻璃钢变得比黑钢更经济。玻璃纤维增强混凝土的净现值(NPC)比黑色钢筋混凝土低约43%。不锈钢的使用也有潜在的优势，但成本效益不如玻璃钢，回收期为50年，NPC比传统设计低25%。与黑钢相比，环氧涂层钢也显示出长期的成本效益，NPC降低了约11%，使用寿命延长了15年。进行敏感性分析，以评估分析期、贴现率、建筑成本、混凝土强度和辅助胶凝材料的使用对LCCA结果的影响。
Reinforced concrete tanks in water/wastewater treatment plants are susceptible to severe corrosion due to aggressive exposure conditions resulting from the application of certain treatment chemicals and methods. Non-corrosive materials, such as stainless steel or fiber reinforced polymer (FRP), may be attractive alternative reinforcement options for such concrete structures. However, the high initial cost of such materials imposes constraints on their use, although such thinking ignores improvements in long-term concrete durability. The current paper addresses the use of non-corrosive reinforcement in a concrete water chlorination tank using life-cycle cost analysis (LCCA) that aims to evaluate the cost effectiveness of different reinforcement alternatives. A comparison was established between four concrete reinforcing materials, namely, black steel, epoxy coated steel, stainless steel, and glass-FRP (GFRP) through a 100-year analysis period.The results of this study suggest that the use of non-corrosive reinforcement helps achieve a considerable long-term cost saving. LCCA showed that GFRP becomes more economical than black steel in 35 years following construction. The net present cost (NPC) obtained for the GFRP-reinforced concrete was approximately 43% lower than that of the black steel reinforced concrete. The use of stainless steel also had a potential advantage but was less cost-effective than GFRP, with a 50-year payback period and an NPC 25% lower than that of the conventional design. Epoxy coated steel also showed a long-term cost benefit when compared to black steel, with approximately 11% reduction in NPC and 15-year extension in the service life. Sensitivity analyses were performed to assess the effects of the analysis period, discount rate, construction costs, concrete strength, and the use of supplementary cementitious materials on the LCCA outcomes.