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玻纤织物增强混凝土界面黏结性能的试验研究
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Experimental Study on Interfacial Bonding Properties of Glass Textile Reinforced Concrete
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    利用MTS万能试验机进行了纤维束的静态拔出试验,分别研究了不同的埋置深度、温度及纤维织物表面改性对耐碱玻璃纤维织物与水泥基体间黏结性能的影响.试验结果表明:玻璃纤维织物与水泥基体的黏结性能与纤维束埋深、纤维织物改性及温度条件存在一定的相关性.在常温条件25 ℃时,随着纤维束埋置深度的增大(15~25 mm),纤维束的拔出刚度、极限拔出力和拔出功不断增大,等效黏结强度反而呈现减小趋势.在相同的埋置深度(15 mm)下,随着温度的升高,纤维束的拔出刚度和极限拔出力不断降低.温度在25 ℃至300 ℃范围时,浸渍环氧树脂或者黏砂处理均能提高纤维束的极限拉拔承载力,且表面黏砂相比浸渍环氧树脂具有更好的增强效果.然而,当温度在400 ℃和500 ℃范围变化时,表面浸渍环氧树脂和黏砂对提高玻璃纤维束的极限拔出力影响不太显著,而在一定程度上降低了极限拔出力.

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    Pullout tests were conducted to investigate the influences of different embedded depths,temperatures and textile modification on the interfacial bonding properties between alkali-resistant(AR) glass textile and cementitious matrix by using a MTS load frame. The experimental data indicated that the bond properties between the glass textile and cement matrix were related to the embedded depth,textile modification and temperature. At the room temperature(25 ℃),the pullout stiffness,ultimate pullout force and pullout work increased,and the equivalent bond strength decreased with the increase of the embedded depth(15~25 mm). When the embedded depths were constant (15 mm),the pullout stiffness and ultimate pullout force of bundles decreased with the increase of the temperature. Impregnating epoxy resin and sticking sand on the surface of AR-glass textile can increase the ultimate pullout force,and sticking sand on the glass textile can increase the ultimate pullout force when the temperature varied from 25 ℃ to 300 ℃. However,impregnating epoxy resin and sticking sand on AR-glass textile do not significantly influence on the ultimate pullout force at the temperatures between 400 ℃ and 500 ℃,and can slightly reduce the ultimate pullout force.

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朱德举,张伟明,刘赛.玻纤织物增强混凝土界面黏结性能的试验研究[J].湖南大学学报:自然科学版,2020,47(3):122~130

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  • 在线发布日期: 2020-03-17
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