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改性和温度对织物增强混凝土界面性能的影响
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Effect of Modification and Temperature on Interfacial Properties of Textile Reinforced Concrete
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    为了研究界面改性和温度对织物增强混凝土(Textile Reinforced Concrete,TRC)界面性能的影响,分别采用环氧树脂、硅烷偶联剂及纳米二氧化硅(SiO2)对纤维表面进行处理,并通过电镜扫描和拔出试验测试处理后纤维微观形貌和TRC试件在25 ℃、100 ℃及200 ℃ 下的宏观力学性能 . 试验结果表明:纳米 SiO2 浸渍和环氧树脂涂层均明显改善碳纤维束在水泥基体中的界面黏结性能 . 纳米 SiO2颗粒能浸入纤维束内部,改善内部纤维丝与基体间的应力传递,同时纳米SiO2与氢氧化钙反应生成水化硅酸钙凝胶,提高其黏结性能. 硅烷偶联剂处理可以增加纤维表面粗糙程度,提高纳米 SiO2 在纤维表面的附着量,从而进一步提升纤维与基体的界面黏结强度. 在100 ℃ 和200 ℃ 下纳米 SiO2浸渍的碳纤维束界面强度显著高于环氧树脂浸渍的. 本研究将为TRC力学性能设计和热稳定性提升方法提供参考.

    Abstract:

    To study the effect of interface modification and temperature on the interface performance of Textile Reinforced Concrete (TRC), the textile surface with epoxy resin, silane coupling agent and nano-silica(SiO2)were treated, respectively. The scanning electron microscope, and pull-out test were conducted to study the micromorphology and macro-mechanical properties of TRC specimens at 25 ℃, 100 ℃, and 200 ℃. The test results show that both nano-SiO2 impregnation and epoxy resin coating can significantly improve the interfacial properties between carbon fiber and the cement matrix. Nano-SiO2 particles can be immersed into the fiber bundle, which improves the stress transfer between the internal fiber filaments and the matrix, and nano-SiO2 reacts with calcium hydroxide to form a calcium silicate hydrate gel, which improves its bonding performance. The silane coupling agent treatment can increase the surface roughness of the fiber, enhance the amount of nano-SiO2 adhered to the fiber, and then improve the bonding strength along the interface with the cement base. The interfacial strength of carbon fiber bundles impregnated with nano-SiO2 at 100 ℃ and 200 ℃ was significantly higher than that impregnated with epoxy resin. This study can provide a reference for TRC mechanical properties design and thermal stability improvement methods.

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朱德举,任京华,郭帅成.改性和温度对织物增强混凝土界面性能的影响[J].湖南大学学报:自然科学版,2022,49(9):117~125

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  • 在线发布日期: 2022-10-04
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