Long Term Behavior of Bond after Interface of Concrete/FRP & Steel/FRP & Coordination of Research on the Utilization of Fibre Composites for Repair/Retrofit of Structure

在过去的十年中，纤维增强聚合物复合材料作为一种可替代的建筑材料受到越来越多的关注。在这一领域的一些研究表明，纤维复合材料在建筑中最有前途的应用之一是在结构修复和改造领域。特别是，该领域的研究表明，环氧树脂粘合纤维复合材料板和层合板可用于各种土木工程类型结构的抗震和非地震力的外部加固。最近美国国家科学基金会关于建筑复合材料领域研究需求的研讨会，清楚地证明了这项技术的前景，以及有效和协调的研究计划的必要性。该项目解决了复合材料/混凝土和复合材料/钢界面的长期耐久性问题。大量的短期研究表明了纤维复合材料在增强结构方面的有效性，然而，很少有研究涉及纤维复合材料的粘结和界面行为，特别是纤维复合材料的长期耐久性。该技术的成功应用需要对长期债券行为有基本的了解。将开发一个全面的加速老化试验程序，以研究用特殊化学溶液模拟的各种恶劣环境条件下的粘结。将建立基于扩散理论的分析模型来预测侵略性元素向复合材料和键中的扩散速率。采用菲克定律来预测水分分布、侵蚀元素向复合材料和结合线上的扩散。派克的关系将被用来估计债券的寿命。＊＊＊

9732908 Saadatmanesh During the past decade, an increasing level of attention has been paid to fiber reinforced polymer composites as an alternative construction materials. Several studies by various researchers in this area have indicated that one of the most promising applications of fiber composites in construction is in the area of structural repair and retrofit. In particular, research in this field has indicated that epoxy bonded fiber composite sheets and laminates can be used to externally reinforce a variety of civil engineering type structures for seismic and nonseismic forces. The recent NSF workshop on research needs in the area of composites for construction, clearly attests to the promise of this technology and to the need for an effective and coordinated research plan. This project addresses the long-term durability of the bond at the interface of composite/concrete and composite/steel. A large number of short term studies have indicated the effectiveness of fiber composites for strengthening of structures, however, very few, if any at all, have addressed the bond and interface behavior, in particular, the long- term durability of the bond. The successful application of this technology requires a fundamental understanding of the long-term bond behavior. A comprehensive, accelerated aging test program will be developed to investigate the bond under various aggressive environmental conditions simulated by special chemical solutions. Analytical models based on diffusion theories will be developed to predict the rate of diffusion of aggressive elements into the composite and the bond. Fick's law will be adopted to predict the moisture profile, and aggressive elements diffusion into the composite and the bondline. Peck's relationship will be utilized to estimate the life of the bond. ***