Abstract Sustainability is of paramount importance when facing the design of long lasting, maintenance demanding structures. In particular, a sustainable life cycle design for concrete structure exposed to aggressive environments may lead to significant economic savings, and to reduced environmental consequences. The present study evaluates 18 different design alternatives for an existing concrete bridge deck exposed to chlorides, analyzing the economic and environmental impacts associated with each design as a function of the maintenance interval chosen. Results are illustrated in the context of a reliability-based maintenance optimization on both life cycle costs and life cycle environmental impacts. Maintenance optimization results in significant reductions of life cycle impacts if compared to the damage resulting from performing the maintenance actions when the end of the service life of the structure is reached. The use of concrete with 10% silica fume has been shown to be the most effective prevention strategy against corrosion of reinforcement steel in economic terms, reducing the life cycle costs of the original deck design by 76%. From an environmental perspective, maintenance based on the hydrophobic treatment of the concrete deck surface results in the best performance, allowing for a reduction of the impacts associated with the original design by 82.8%.

中文翻译：

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生命周期视角下基于可靠性的防腐蚀设计维护优化

摘要 在面对持久耐用、维护要求高的结构设计时，可持续性至关重要。特别是，暴露于恶劣环境的混凝土结构的可持续生命周期设计可能会带来显着的经济节约，并减少对环境的影响。本研究评估了暴露于氯化物的现有混凝土桥面板的 18 种不同设计备选方案，分析了与每种设计相关的经济和环境影响，作为所选维护间隔的函数。结果在基于可靠性的维护优化的环境中说明，涉及生命周期成本和生命周期环境影响。与结构使用寿命结束时执行维护操作所造成的损坏相比，维护优化可显着减少生命周期影响。从经济角度来看，使用含 10% 硅粉的混凝土已被证明是防止钢筋腐蚀的最有效策略，将原始甲板设计的生命周期成本降低了 76%。从环境角度来看，基于混凝土甲板表面疏水处理的维护可实现最佳性能，将与原始设计相关的影响减少 82.8%。从经济角度来看，使用含 10% 硅粉的混凝土已被证明是防止钢筋腐蚀的最有效策略，将原始甲板设计的生命周期成本降低了 76%。从环境角度来看，基于混凝土甲板表面疏水处理的维护可实现最佳性能，将与原始设计相关的影响减少 82.8%。从经济角度来看，使用含 10% 硅粉的混凝土已被证明是防止钢筋腐蚀的最有效策略，将原始甲板设计的生命周期成本降低了 76%。从环境角度来看，基于混凝土甲板表面疏水处理的维护可实现最佳性能，将与原始设计相关的影响减少 82.8%。