织物层间角对玄武岩纤维织物增强混凝土静动态力学性能的影响

Effect of fabric spiral angle on static and dynamic mechanical properties of basalt textile reinforced concrete

  • 摘要: 受螳螂虾螺旋层状结构的启发,本研究采用螺旋式铺设织物的方式制备织物增强混凝土。采用静态拉伸试验探究不同织物层间角(0°、15°、30°和45°)对玄武岩纤维织物增强混凝土(BTRC)力学性能的影响,并结合数字图像分析技术裂缝与应变演变规律。同时,开展低速冲击试验以评估其抗冲击性能。结果表明:在静态拉伸实验中,相较于织物层间角为0°的BTRC,层间角为15°、30°和45°的BTRC试件的最大拉伸强度分别下降了51%、62%和52%。裂缝数量和韧性等参数同样呈现先减小后增大的趋势,而其极限拉伸应变分别提高了17%、26%和43%。在56.64 J冲击能量下,各个层间角试件的最大冲击力变化不大,但对比织物层间角为0°的BTRC试件的能量吸收,层间角为45°的BTRC试件能量吸收量提高了约17.61%。本研究为拓展织物的铺设方式提供了新思路。

     

    Abstract: Inspired by the spiral layered structure of mantis shrimp, fabric reinforced concrete was prepared by laying fabric in spiral way, the effect of fabric spiral angle on the static and dynamic mechanical properties of basalt textile reinforced concrete is studied. In order to study the effect of different fabric spiral angles on the mechanical properties of basalt textile reinforced concrete (BTRC), the static tensile test and digital image analysis technique were used to obtain the crack and strain of BTRC with different spiral angles, and the low velocity impact test was used to evaluate the impact resistance of BTRC with different spiral angles. The results show that the maximum tensile strength of BTRC specimens with spiral angle of 15°, 30° and 45° decreased by 51%, 62% and 52% respectively compared with that of BTRC specimens with spiral angle of 0°, the crack number and toughness also decreased first and then increased, but the ultimate tensile strain increased by 17%, 26% and 43%, respectively. At 56.64 J impact energy, the maximum impact force of each spiral angle specimens does not vary much. But the energy absorption of BTRC specimens with spiral angle of 45° increased by 17.61% compared with that of BTRC specimens with spiral angle of 0°. This research is helpful to develop a new way of fabric laying and further strengthen the mechanical properties of textile reinforced concrete.

     

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