ESTABLISHMENT OF MAINTENANCE SYSTEM FOR CONCRETE STRUCTURES

在本研究中，为了社会发展的可持续性和可行性，建立了混凝土结构的维护体系。本研究得到的结果可以总结如下。(1)给出了选择修复和强化材料和/或技术的程序。使用修复和强化材料和/或技术，将主要在安全性和可使用性方面恢复耐久性性能。特别是混凝土结构在恶劣环境下的安全性能通常取决于钢筋的腐蚀情况，对钢筋具有本质保护作用的（覆盖）混凝土耐久性是否足够至关重要。因此，通过材料耐久性试验或耐久性数值模拟，提出了能够防止钢筋腐蚀发生或发展的修复增强材料。(2)通过研究劣化或复合劣化对混凝土结构组成材料力学性能的影响，提出了混凝土结构全寿命期内混凝土、钢筋和混凝土-钢粘结物力学性能的公式化方法。并给出了利用这些力学性能预测混凝土构件或结构安全性能的方法。(3)混凝土结构的维护应在整个工程开始时考虑，因为维护水平将影响混凝土结构的设计和施工。考虑到世界范围内混凝土结构设计规范的流行趋势，维护系统以性能规范为基础，包括性能验证。主要性能是关于安全性、适用性、对第三方的危害、美观性和耐久性，应考虑到性能随时间的变化而进行验证。(4)提出了适用于简单或复杂劣化现象的维修强化准则，作为一般维修体系的组成部分。少

In this research, the maintenance system of concrete structures for the sustainability and feasibility of social development was established.The results obtained in this study can be summarized as follows.(1)The procedure for choosing the repair and strengthening materials and/or techniques was shown. The recovery of durability performance on mainly safety and serviceability will be achieved using repair and strengthening materials and/or techniques. Especially, the safety performance of concrete structure subjected to the severe environment usually depends on the reinforcing steel corrosion, and it is important that the durability of (cover) concrete, which has the protective function for reinforcement essentially, is sufficient. Therefore, material durability tests or durability numerical simulations proposed the repair and strengthening materials, which could prevent the corrosion occurring or developing on the reinforcement.(2)The method to formularize the mechanical property of co … More ncrete, reinforcing steel and bond of concrete-steel in the whole life of concrete structure was shown by investigating the influence of deterioration or complex deterioration on the mechanical property of constituent materials of concrete structures. The procedure to predict the safety performance of concrete member or structure using those mechanical properties was also shown. Furthermore, non-destructive test for concrete structure(3)The maintenance of concrete structure should be considered at the beginning of total project, because the level of maintenance would influence the design and construction of concrete structure. The maintenance system is based on performance specifications including verification of performance, in the view of worldwide fashion of design code on concrete structures. The principal performances are about safety, serviceability, hazards to third parties, aesthetic appearance and durability, which should be verified in consideration of time dependent change in performance.(4)The guideline on repair and strengthening, which was applicable to simple or complex deterioration phenomenon, was proposed as a component of general maintenance system. Less