The effect of using high-performance polypropylene fiber–reinforced cementitious mortar on reinforced concrete beam repair was presented in this article. Results of an experimental study for the flexural performance of 13 reinforced concrete beams were presented. The corrosion level, in terms of the mass loss of steel, was estimated to be 10% and 15%. Three non-strengthened specimens were tested as a reference: one control uncorroded specimen and two control specimens corroded with 10% and 15%. Ten specimens were strengthened using different techniques; replacement of the spilled concrete at the tension zone with 40-mm-thick high-performance polypropylene fiber–reinforced cementitious mortar, using external prestressing bars at the tension zone with adding 20-mm-thick high-performance polypropylene fiber–reinforced cementitious mortar at the compression zone, and a combination of these techniques. The prestressing reinforcing bars stress was chosen to be 0.25fpy and 0.38fpy for the corroded 10% specimens and 0.25fpy for the corroded 15% specimens. A combination of 40-mm-thick high-performance polypropylene fiber–reinforced cementitious mortar at the tension side and external prestressing bars at the tension zone increased the specimen capacity by 15% and 34% compared with the uncorroded and 10% corroded control specimens, respectively. A comparative study was conducted to evaluate the efficiency of various strengthening techniques. An analytical model was proposed in order to give design guidelines.

中文翻译：

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使用高性能胶凝砂浆外加预应力对锈蚀钢筋混凝土梁进行改造

本文介绍了使用高性能聚丙烯纤维增强水泥砂浆对钢筋混凝土梁修复的效果。介绍了 13 根钢筋混凝土梁的抗弯性能试验研究结果。就钢的质量损失而言，腐蚀程度估计为 10% 和 15%。测试了三个未强化试样作为参考：一个对照未腐蚀试样和两个对照试样，分别腐蚀了 10% 和 15%。十个标本使用不同的技术进行了加固；用 40 毫米厚的高性能聚丙烯纤维增强水泥砂浆代替受拉区溢出的混凝土，在受拉区使用外部预应力钢筋，在受压区添加 20 毫米厚的高性能聚丙烯纤维增强水泥砂浆，以及这些技术的组合。预应力钢筋应力选择为 0.25fpy 和 0.38fpy 腐蚀 10% 试样和 0.25fpy 腐蚀 15% 试样。与未腐蚀和腐蚀 10% 的对照试样相比，受拉侧 40 毫米厚的高性能聚丙烯纤维增强水泥砂浆和受拉区的外部预应力钢筋的组合使试样承载力提高了 15% 和 34%，分别。进行了比较研究以评估各种强化技术的效率。提出了一个分析模型，以提供设计指南。以及这些技术的组合。预应力钢筋应力选择为 0.25fpy 和 0.38fpy 腐蚀 10% 试样和 0.25fpy 腐蚀 15% 试样。与未腐蚀和腐蚀 10% 的对照试样相比，受拉侧 40 毫米厚的高性能聚丙烯纤维增强水泥砂浆和受拉区的外部预应力钢筋的组合使试样承载力提高了 15% 和 34%，分别。进行了比较研究以评估各种强化技术的效率。提出了一个分析模型，以提供设计指南。以及这些技术的组合。预应力钢筋应力选择为 0.25fpy 和 0.38fpy 腐蚀 10% 试样和 0.25fpy 腐蚀 15% 试样。与未腐蚀和腐蚀 10% 的对照试样相比，受拉侧 40 毫米厚的高性能聚丙烯纤维增强水泥砂浆和受拉区的外部预应力钢筋的组合使试样承载力提高了 15% 和 34%，分别。进行了比较研究以评估各种强化技术的效率。提出了一个分析模型，以提供设计指南。与未腐蚀和腐蚀 10% 的对照试样相比，受拉侧 40 毫米厚的高性能聚丙烯纤维增强水泥砂浆和受拉区的外部预应力钢筋的组合使试样承载力提高了 15% 和 34%，分别。进行了比较研究以评估各种强化技术的效率。提出了一个分析模型，以提供设计指南。与未腐蚀和腐蚀 10% 的对照试样相比，受拉侧 40 毫米厚的高性能聚丙烯纤维增强水泥砂浆和受拉区的外部预应力钢筋的组合使试样承载力提高了 15% 和 34%，分别。进行了比较研究以评估各种强化技术的效率。提出了一个分析模型，以提供设计指南。