Abstract

The edge beams of reinforced concrete bridges with de-icing salts sprayed experience extensive corrosion damage. The average service life of edge beams needing replacement in Sweden has been reported as only 45 years, causing great economic loss to both owners and users. Hence, finding a durable solution for edge beams would benefit society. Hybrid reinforced concrete structures, produced by adding a low-to-moderate fibre content into traditional reinforced concrete, can effectively limit the service crack width and improve resistance to chloride-induced corrosion damage. In this paper, different alternatives of hybrid and traditional reinforced edge beams were designed for a case study. The service life of the alternatives was compared by conducting chloride diffusion calculations and by applying a corrosion-induced cracking model. The economic and environmental (indicated by greenhouse gas emissions) benefits of using hybrid reinforced edge beams were assessed by life-cycle cost analysis and life-cycle assessment. The results showed that the service life of edge beams made of hybrid reinforced concrete can be prolonged by over 58%, thereby enabling a significant reduction in the total life-cycle costs and annual total greenhouse gas emissions.

摘要

喷洒了除冰盐的钢筋混凝土桥梁的边梁遭受了广泛的腐蚀破坏。据报道，瑞典需要更换的边梁平均使用寿命仅为45年，给业主和用户都造成了巨大的经济损失。因此，为边梁找到一个持久的解决方案将有利于社会。在传统钢筋混凝土中添加中低纤维含量的混合钢筋混凝土结构可以有效限制服役裂缝宽度，提高抗氯化物腐蚀破坏的能力。在本文中，为案例研究设计了混合和传统加固边梁的不同替代方案。通过进行氯化物扩散计算和应用腐蚀诱发开裂模型来比较替代品的使用寿命。通过生命周期成本分析和生命周期评估来评估使用混合加固边梁的经济和环境（以温室气体排放量表示）效益。结果表明，混合钢筋混凝土边梁的使用寿命可延长58%以上，从而显着降低总生命周期成本和年温室气体排放总量。