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替代建筑材料受到越来越多的关注。 在这一领域的各种研究人员的几项研究表明，纤维复合材料在建筑中最有前途的应用之一是在结构维修和改造领域。 特别是，在这一领域的研究表明，环氧树脂粘结的纤维复合材料板和层压板可用于外部加强各种土木工程类型的结构，地震和非地震力。 美国国家科学基金会最近召开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。 本项目研究复合材料/混凝土和复合材料/钢界面粘结的长期耐久性。 大量的短期研究表明了纤维复合材料用于结构加固的有效性，然而，很少（如果有的话）涉及粘结和界面行为，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基本的了解。 将制定一项全面的加速老化试验计划，以研究在特殊化学溶液模拟的各种侵蚀性环境条件下的粘合情况。 将开发基于扩散理论的分析模型，以预测侵蚀性元素扩散到复合材料和粘结剂中的速率。 Fick定律将被用来预测水分分布，以及侵蚀性元素扩散到复合材料和胶层中。 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. ***