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

9732908萨达特马内什在过去的十年里，纤维增强聚合物复合材料作为一种替代建筑材料越来越受到重视。多位研究者的研究表明，纤维复合材料在建筑领域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，环氧粘结纤维复合材料板材和层合板可用于对各种土木工程类型的结构进行地震和非地震力的外部加固。美国国家科学基金会最近举办的关于建筑用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/钢界面处粘结的长期耐久性问题。大量的短期研究表明了纤维复合材料对结构加固的有效性，然而，很少(如果有的话)研究了粘结和界面行为，特别是粘结的长期耐久性。这项技术的成功应用需要对长期债券行为有一个基本的了解。将制定一项全面的加速老化测试计划，以研究在由特殊化学溶液模拟的各种侵蚀性环境条件下的粘结。将开发基于扩散理论的分析模型来预测侵蚀性元素向复合材料和粘结物中的扩散速率。将采用Fick定律来预测水分分布，以及侵蚀性元素向复合材料和粘结线的扩散。佩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. ***