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| 偏高岭土-矿渣地聚物混凝土与钢筋的粘结性能 |
| Bond Performance between Metakaolin-slag Based Geopolymer Concrete and Reinforcing Bar |
| 投稿时间：2023-10-30 修订日期：2023-12-02 |
| DOI： |
| 中文关键词: 地质聚合物混凝土 粘结性能 破坏形态 粘结-滑移本构模型 钢筋 |
| 英文关键词: Geopolymer concrete bond performance failure mode bond-slip constitutive model reinforcing bar |
| 基金项目:国家留学基金资助项目 |
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| 中文摘要: |
| 为研究地质聚合物混凝土(Geopolymer concrete, GPC)与钢筋之间的粘结性能,对27个偏高岭土(MK)-矿渣(GGBS)基GPC与钢筋粘结试件进行了中心拉拔试验,分析了粘结长度和钢筋直径对破坏形态、粘结强度和峰值滑移的影响,根据粘结应力-滑移曲线特征揭示了粘结机理。基于现有文献和试验所得数据,统计分析得到GPC与普通硅酸盐混凝土(Ordinary Portland concrete,OPC)与钢筋粘结性能的差异,同时建立了四段式粘结-滑移本构模型。结果表明：GPC与钢筋粘结试件的破坏形态有拔出破坏、劈裂-拔出破坏和劈裂破坏；随粘结长度和钢筋直径增大,试件由拔出破坏变为劈裂-拔出或劈裂破坏,界面GPC破坏程度减小,粘结强度降低,峰值滑移减小,当钢筋直径为20mm,粘结强度和峰值滑移略有回升；基于拔出破坏建立的粘结-滑移本构模型与试验曲线拟合较好。 |
| 英文摘要: |
| In order to research the bond performance between Geopolymer concrete (GPC) and reinforcing bar, pull-out tests on 27 bond specimens between metakaolin-slag based GPC and reinforcing bar were carried out, the influences of bond length and bar diameter in failure modes, bond-slip behaviors, and slip at peak bond stress were investigated, the bond mechanism was revealed by the features of bond stress-slip curves. Based on existing articles and experimental data, the difference between GPC and Ordinary Portland concrete (OPC) in bond performance with reinforcing bar was obtained by statistical analysis, furthermore, the four-stage bond-slip constitutive model was established. The results show that there are three failure modes of bond specimens between GPC and reinforcing bar: pull-out failure, splitting-pull-out failure and splitting failure. With the augment of bond length and bar diameter, the failure modes change into splitting-pull-out or splitting failure from pull-out failure, damage degree of GPC on the bond interface reduce, the bond strength decreases and the slip at peak bond stress increases, the bond strength and the slip at peak stress enable improvement slightly with diameter of 20mm. In addition, the bond-slip constitutive model established for pull-out failure is in excellent agreement with the experimental curves. |
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