Flexural Performance of Repaired RC Beams with Grouting and GFRP Sheet Equipped with Anchors

Key Engineering Materials Pub Date : 2024-05-14 DOI:10.4028/p-6gfact

Muhammad Ali, R. Djamaluddin, R. Irmawaty, F. Fakhruddin, A. A. Sila

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Abstract

In this study, an experiment was performed on flexural behavior of RC beam that experienced spalling due to corrosion. The spalled concrete was repaired using grouted mortar, while the lost reinforcement area was replaced with Glass Fiber Reinforced Polymer (GFRP) sheets. The effectiveness of these repairs relied heavily on the bond between the existing and new concrete, ensuring no delamination occurred under maximum load. To enhance this bond, connectors or dyna-bolt anchors were incorporated into the joint area. Eight RC beam were prepared, each with a cross-section of 150 mm x 200 mm and length of 3300 mm, consisting of 1) two existing beams (BE), 2) two beams repaired with grouting and GFRP sheet (BGS), 3) two beams with grouting, GFRP sheet, and the addition of 4 anchors (BGS-DN4), and 4) two beams with grouting, GFRP sheet, and the addition of 8 anchors (BGS-DN8). The repaired area was 2700 mm long and 50 mm thick, and then flexural testing using four-point loads was conducted on all specimens. The results showed that RC beam repaired with mortar grouting and GFRP sheets, along with the inclusion of 4 dyna-bolt anchors in the connection area (BGS-DN4), could increase the maximum load by 61% compared to BE. This repair method improved the bond between the existing concrete and the repair material, effectively preventing delamination.

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使用灌浆和装有锚栓的玻璃纤维增强塑料板修复的钢筋混凝土梁的挠曲性能

本研究对因腐蚀而剥落的 RC 梁的弯曲行为进行了实验。剥落的混凝土使用灌浆砂浆进行了修复，同时用玻璃纤维增强聚合物（GFRP）板替代了钢筋损失区域。这些修复工程的效果在很大程度上取决于现有混凝土和新混凝土之间的粘结力，以确保在最大荷载下不会发生分层。为了增强这种粘合力，在接合处安装了连接器或锚栓。共准备了八根 RC 梁，每根横截面为 150 毫米 x 200 毫米，长度为 3300 毫米，包括：1）两根现有梁（BE）；2）两根用灌浆和 GFRP 板修复的梁（BGS）；3）两根用灌浆和 GFRP 板修复的梁，并增加了 4 个锚栓（BGS-DN4）；4）两根用灌浆和 GFRP 板修复的梁，并增加了 8 个锚栓（BGS-DN8）。修复区域的长度为 2700 毫米，厚度为 50 毫米，然后对所有试样进行了四点荷载抗弯试验。结果表明，与 BE 相比，使用砂浆灌浆和 GFRP 片材修复的 RC 梁，以及在连接区域加入 4 个 dyna-bolt 锚固件（BGS-DN4），可将最大荷载提高 61%。这种修复方法改善了现有混凝土与修复材料之间的粘结，有效防止了分层。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Key Engineering Materials

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