Many studies suggest that the durability of glass-fiber-reinforced-polymer (GFRP) bars in a simulated concrete pore solution is very different than the same bars in an actual concrete environment. This study conducted a comparative evaluation of the durability of GFRP bars in concrete and in simulated concrete environments by investigating their interlaminar shear strength. It focused on evaluating the physical, mechanical, and microstructural properties of GFRP bars subjected to high moisture, saline, and alkaline environments. Bare GFRP bars and cement-embedded GFRP bars were immersed in solutions at different temperatures (23°C, 60°C, and 80°C) and for different exposure times (28, 56, and 112 days). The results show that the percentage water uptake and the apparent diffusivity of the GFRP bars were strongly dependent on the type and temperature of the immersion solution. The interlaminar shear strength of the GFRP bars directly immersed in a solution degraded more significantly than those embedded in concrete and immersed. Moreover, the alkaline solution was more aggressive to the GFRP bars than tap water or saline solution, affecting bar fiber, matrix interface, and chemical structure. As a result of this study, master curves and time-shift factors were developed to correlate the retention of interlaminar shear strength from the accelerated aging test to the service life of GFRP bars in an actual concrete environment.

许多研究表明，玻璃纤维增​​强聚合物（GFRP）钢筋在模拟混凝土孔隙溶液中的耐久性与实际混凝土环境中的相同钢筋非常不同。这项研究通过研究其在层间的剪切强度，对混凝土和模拟混凝土环境中的GFRP钢筋的耐久性进行了比较评估。它专注于评估GFRP钢筋在高湿度，高盐和碱性环境下的物理，机械和微观结构性能。将裸露的GFRP条和水泥包埋的GFRP条浸入不同温度（23°C，60°C和80°C）和不同暴露时间（28、56和112天）的溶液中。结果表明，GFRP条的吸水率和表观扩散率强烈取决于浸入溶液的类型和温度。直接浸入溶液中的GFRP筋的层间剪切强度比埋入混凝土中并浸入水中的GFRP钢筋的降解更显着。此外，与自来水或盐水溶液相比，碱性溶液对GFRP胶条更具腐蚀性，影响胶条纤维，基质界面和化学结构。这项研究的结果是，开发了主曲线和时移因子，以将加速老化测试中层间剪切强度的保持与实际混凝土环境中GFRP钢筋的使用寿命相关联。直接浸入溶液中的GFRP筋的层间剪切强度比埋入混凝土中并浸入水中的GFRP钢筋的降解更显着。此外，与自来水或盐水溶液相比，碱性溶液对GFRP胶条更具腐蚀性，影响胶条纤维，基质界面和化学结构。这项研究的结果是，开发了主曲线和时移因子，以将加速老化测试中层间剪切强度的保持与实际混凝土环境中GFRP钢筋的使用寿命相关联。直接浸入溶液中的GFRP筋的层间剪切强度比埋入混凝土中并浸入水中的GFRP钢筋的降解更显着。此外，与自来水或盐水溶液相比，碱性溶液对GFRP胶条更具腐蚀性，影响胶条纤维，基质界面和化学结构。这项研究的结果是，开发了主曲线和时移因子，以将加速老化测试中层间剪切强度的保持与实际混凝土环境中GFRP钢筋的使用寿命相关联。