This study conducts an investigation into the effect of the geopolymer mortar (GPM) thickness on the bond behavior of the FRP grid-concrete interface. Eighteen specimens were tested under the single-lap shear loading to evaluate the effect of the mortar thickness (8/10/15/20/25 mm) and macro fiber reinforcement from failure mode, load response, strain distribution, and bond stress distribution. The study further assessed the applicability of existing calculation models for the FRP grid-concrete interface. The results indicate that the ultimate load initially increased and then decreased as the mortar thickness increased, and the macro fiber reinforced mortar enhanced the ultimate load. However, mortar thickness variation and macro fiber reinforcement had little effect on the failure mode, strain distribution, and bond stress distribution, while lager thickness and macro fibers significantly reduced crack occurrences. Additionally, existing models for the FRP sheet-concrete interface tended to underestimate the effective bond length and interface fracture energy of the FRP grid-concrete interface. Regression analysis, based on existing models, enabled the development of effective bond length and bond-slip relationships, showcasing satisfactory accuracy.

中文翻译：

---

以地质聚合物砂浆为粘合剂的 FRP 网格-混凝土界面的粘结行为


本研究研究了地质聚合物砂浆（GPM）厚度对 FRP 网格-混凝土界面粘结行为的影响。在单搭接剪切载荷下测试了 18 个样本，从破坏模式、载荷响应、应变分布和粘结应力分布方面评估砂浆厚度 (8/10/15/20/25 mm) 和粗纤维增强的影响。该研究进一步评估了现有计算模型对FRP网格-混凝土界面的适用性。结果表明，随着砂浆厚度的增加，极限荷载先增大后减小，粗纤维增强砂浆增强了极限荷载。然而，砂浆厚度变化和粗纤维增强对破坏模式、应变分布和粘结应力分布影响不大，而较大的厚度和粗纤维则显着减少裂缝的发生。此外，现有的 FRP 板-混凝土界面模型往往会低估 FRP 网格-混凝土界面的有效粘结长度和界面断裂能。基于现有模型的回归分析能够开发有效键长和键滑移关系，显示出令人满意的准确性。