ESTABLISHMENT OF MAINTENANCE SYSTEM FOR CONCRETE STRUCTURES

本研究从社会发展的可持续性和可行性出发，建立了混凝土结构的维修体系，主要研究成果如下：(1)提出了混凝土结构维修加固材料和/或技术的选择步骤。将使用修复和加固材料和/或技术来恢复主要在安全性和适用性方面的耐久性能。尤其是混凝土结构在恶劣环境下的安全性能往往依赖于钢筋的锈蚀，而具有钢筋防护功能的保护层混凝土的耐久性是至关重要的。因此，材料耐久性试验或耐久性数值模拟提出了修复加固材料，以防止钢筋锈蚀的发生或发展。(2)co…力学性能的公式化方法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，揭示了混凝土结构全寿命过程中混凝土、钢筋和混凝土与钢的粘结程度较高。文中还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。混凝土结构的无损检测(3)混凝土结构的养护应从工程开始就开始考虑，因为养护的好坏直接影响到混凝土结构的设计和施工。从世界范围内的混凝土结构设计规范来看，维护体系是以性能规范为基础的，包括性能验证。主要表现在安全性、适用性、对第三方的危害、外观美观和耐久性，应考虑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加固指南，作为一般维修体系的组成部分。较少

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