Yang Xue, Wu Tao, Liu Xi
School of Civil Engineering, Chang'an University, Xi'an 710061, China.
Polymers (Basel). 2022 Apr 20;14(9):1675. doi: 10.3390/polym14091675.
This research aimed to investigate the hybrid effects of carbon and polypropylene fibers on the stress-strain behavior of lightweight aggregate concrete (LWAC). The considered test variables were two fiber volume fractions of 0.2% and 0.4% and two water/binder ratios of 0.27 and 0.30. Eighteen groups of prisms fabricated with fiber-reinforced LWAC were tested under axial compressive load. Experimental studies were carried out to analyze the influence of different fiber combinations on the complete stress-strain behavior. It was found that the carbon-polypropylene hybrid fibers led to toughness enhancement that was numerically more significant than the sum of individual fibers, indicating a positive synergistic effect between them. Finally, a mathematical expression of the stress-strain curve accounting for the fiber combinations was developed. Compared with existing stress-strain models, the proposed model shows better accuracy in predicting the effect of carbon and polypropylene fibers in both single and hybrid forms on the stress-strain curve of LWAC.
本研究旨在探究碳纤和聚丙烯纤维对轻骨料混凝土（LWAC）应力-应变行为的混杂效应。考虑的试验变量为两种纤维体积分数，分别为0.2%和0.4%，以及两种水胶比，分别为0.27和0.30。对18组由纤维增强轻骨料混凝土制成的棱柱体进行了轴向压缩荷载试验。开展试验研究以分析不同纤维组合对完整应力-应变行为的影响。结果发现，碳纤-聚丙烯混杂纤维使韧性增强，在数值上比单独纤维增强的总和更显著，表明二者之间存在正协同效应。最后，建立了考虑纤维组合的应力-应变曲线数学表达式。与现有应力-应变模型相比，所提出的模型在预测碳纤和聚丙烯纤维以单一和混杂形式对轻骨料混凝土应力-应变曲线的影响方面具有更高的准确性。
