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Durability of reinforced concrete beams strengthened by galvanized steel mesh-epoxy systems under harsh environmental conditions

机译：在苛刻的环境条件下镀锌钢网环氧系统加强钢筋混凝土梁的耐久性

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摘要

Strengthening and rehabilitation of reinforced concrete (RC) structural elements are being efficiently carried out by fiber-reinforced polymer (FRP) composite materials. However, their long-term durability is still causing concerns for the repairing industry. Recently, the use of steel wire mesh-epoxy systems for strengthening is gaining the attention of researchers and engineers and their long-term durability warrants investigation. This paper presents the results of an extensive experimental study carried out on 60 RC beams strengthened in flexure by medium and high cord density galvanized steel mesh (MSM, HSM). In order to evaluate the dura-bility of these strengthening systems, the RC beams were exposed to direct sunlight and immersed under saline water for 6,12, and 24 months. The beams were tested under four-point bending till failure after each exposure period. The MSM and HSM strengthened beams showed up to 51 and 62% higher load-carrying capacity than that of the control beams at 28 days, respectively, and up to 82% after two years of sun and saline water expo-sure. Furthermore, the exposed beams showed significant delay in crack initiation, no pronounced degradation in strength or stiffness, and no delamination of epoxy. On the contrary, there was significant improvement in the strength of the exposed beams, especially that of the MSM. Based on ACI 440.2R-17 Guidelines, environ-mental reduction factors were proposed for the exposed beams. This study showed that galvanized MSM and HSM laminates could be promising and durable alternative materials for rehabilitation, retrofitting, and strengthening of RC members under harsh climatic conditions of elevated temperature, high salinity, and high humidity.
机译：通过纤维增强聚合物（FRP）复合材料有效地进行钢筋混凝土（RC）结构元件的加强和恢复。然而，他们的长期耐用性仍然对修理行业造成担忧。最近，使用钢丝网环氧系统来加强研究人员和工程师的注意力，并进行了长期耐用性认股权证调查。本文介绍了通过中型和高帘线密度镀锌钢网（MSM，HSM）在弯曲中加强的60 RC梁进行了广泛的实验研究的结果。为了评估这些强化系统的杜拉合体，RC梁暴露于阳光直射并浸入盐水下6,12和24个月。在每次曝光期后，在四点弯曲下测试梁在四点弯曲。 MSM和HSM加强光束分别在28天的控制梁的载荷容量上显示出高达51和62％，在两年的阳光和盐水扩展后持续高达82％。此外，暴露的光束显示出裂纹引发的显着延迟，在强度或刚度中没有明显的降解，并且没有环氧树脂的分层。相反，暴露梁的强度显着改善，特别是MSM的强度。基于ACI 440.2R-17指南，提出了曝光梁的环境减少因子。该研究表明，镀锌MSM和HSM层压板可能是有前途和耐用的替代材料，用于在升高的温度，高盐度和高湿度的恶劣气候条件下进行恢复，改造和加强RC成员。

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