...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Construction and Building Materials >Reinforced concrete repairs in beams
【24h】

Reinforced concrete repairs in beams

机译：钢筋混凝土梁维修

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effectiveness of reinforced concrete repairs may be established in terms of their ability to restore the structural integrity of the reinforced concrete element and to protect the reinforcement from severe weathering conditions. Therefore, 18 large scale reinforced concrete beams were cast and subject to an accelerated corrosion mechanism in a chloride environment. The beams were repaired using two different materials for comparison purposes, namely an OPC mortar and a free flowing micro-concrete. Twelve beams were tested just after the repair material has cured, and the remaining beams were subjected to an aggressive weathering cycle for 6 months after which structural and electrochemical testing were conducted. This paper presents the results of both structural load testing of all beams, and physical and electrochemical performance of repaired beams before and during the accelerated weathering. The results of structural testing showed that in short-term situation both materials behaved very similar to each other and were able to restore 60-70/100 of the beams' capacity. But in long-term situation the OPC mortar beams has deteriorated badly showing extensive cracking, while the free flowing micro concrete beams have shown very little cracking. The former restored only 40-50/100 of the capacity while the latter restored approximately 90/100. The electrochemical monitoring data provided a useful comparison of two repair systems in terms of inhibitive influence of repairs on steel reinforcement and electrochemical interactions between the repaired and unrepaired areas. The protection afforded to the corroded rebars and subsequent reduction in corrosion rate was more significant with free flowing micro-concrete repair material than with OPC mortar. Incipient anodes were formed at the repair/concrete interfaces soon after the repair. Under accelerated weathering conditions, free flowing micro-concrete has been found to offer better resistance to chloride ingress from an external source than OPC mortar. A significant increase in corrosion rate and concrete surface weathering was observed in the climatic chamber, hence suggesting that a long term performance of a repair material can be assessed in a short time scale under these conditions.
机译：可以根据钢筋混凝土修复钢筋混凝土构件的结构完整性并保护钢筋免受严重风化条件的能力来确定其有效性。因此，浇铸了18条大型钢筋混凝土梁，并在氯化物环境中经受加速的腐蚀机理。为了进行比较，使用两种不同的材料（即OPC砂浆和自由流动的微混凝土）对梁进行了修复。修复材料固化后立即测试了十二根梁，其余的梁经受了6个月的侵蚀性老化循环，然后进行了结构和电化学测试。本文介绍了所有梁的结构载荷测试结果以及加速老化之前和期间修复后的梁的物理和电化学性能。结构测试的结果表明，在短期情况下，两种材料的性能彼此非常相似，并且能够恢复60-70 / 100的梁容量。但是在长期情况下，OPC砂浆梁已经严重恶化，显示出大范围的开裂，而自由流动的微混凝土梁则几乎没有开裂。前者仅恢复了容量的40-50 / 100，而后者则恢复了大约90/100。电化学监测数据就修复对钢筋的抑制作用以及修复和未修复区域之间的电化学相互作用而言，提供了两种修复系统的有用比较。与OPC砂浆相比，自由流动的微混凝土修复材料对腐蚀的钢筋提供的保护和随后的腐蚀速率降低更为显着。修复后不久，在修复/混凝土界面处形成了初始阳极。在加速风化条件下，已发现自由流动的微混凝土比OPC砂浆具有更好的抗外部来源氯离子侵入的能力。在气候室内观察到腐蚀速率和混凝土表面风化的显着提高，因此表明在这些条件下，可以在短时间内评估修补材料的长期性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号