Wei Hui, Wu Tao, Yang Xue
School of Civil Engineering, Chang'an University, Xi'an 710061, China.
Materials (Basel). 2020 Jan 31;13(3):640. doi: 10.3390/ma13030640.
The impact of carbon and polypropylene fibers in both single and hybrid forms on the properties of lightweight aggregate concrete (LWAC), including the slump, density, segregation resistance, compressive strength, splitting tensile strength, flexural strength, and compressive stress-strain behavior, were experimentally investigated. The toughness ratio and ductility index were introduced for quantitatively evaluating the energy-absorbing capacity and post-peak ductility. A positive synergistic effect of hybrid carbon and polypropylene fibers was obtained in terms of higher tensile strength, toughness, and ductility. The toughness ratio and ductility index of hybrid fiber-reinforced LWAC were increased by 26%-37% and 12%-27% compared with plain LWAC, respectively. The fiber in both single and hybrid forms had a smaller effect on the linearity ascending branch of the stress-strain curves, whereas the post-peak patterns in terms of the toughness and ductility for the hybrid fiber-reinforced LWAC were significantly improved when the fiber in hybrid form.
研究了单一形式和混杂形式的碳纤和聚丙烯纤维对轻骨料混凝土（LWAC）性能的影响，包括坍落度、密度、抗离析性、抗压强度、劈裂抗拉强度、抗弯强度和抗压应力 - 应变行为。引入韧性比和延性指数来定量评估能量吸收能力和峰值后延性。在较高的抗拉强度、韧性和延性方面，混杂碳纤和聚丙烯纤维获得了正协同效应。与素轻骨料混凝土相比，混杂纤维增强轻骨料混凝土的韧性比和延性指数分别提高了26% - 37%和12% - 27%。单一形式和混杂形式的纤维对应力 - 应变曲线的线性上升段影响较小，而当采用混杂形式的纤维时，混杂纤维增强轻骨料混凝土在韧性和延性方面的峰值后模式得到显著改善。
