Foam concrete, a new kind of building material, has attracted wide attention due to its high energy absorption capability and low density. However, the low strength and poor toughness of foam concrete have become obstacles to hinder its further application. Coir fiber (CF), as a renewable recycled plant fiber, has shown a significant effectiveness for improving the mechanical properties of cement-based materials in some previous studies. In this paper, CF was introduced into foam concrete to develop its dynamic performance. A total of 54 foam concrete specimens with different CF contents (0.0%, 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%) were prepared and divided into six groups. A single-impact test was carried out at three driving gas pressures (0.20, 0.25, and 0.30 MPa) by means of Split Hopkinson pressure bar experimental technology to investigate the effect of CF content on the dynamic performance of foam concrete, including the failure mode, dynamic compressive strength, stress-strain behavior, and energy absorption capacity. Furthermore, to explain the change mechanism of CF-foam concrete, a microstructure analysis was conducted through a scanning electron microscope and X-ray diffraction. The results revealed that an appropriate amount of CF could significantly improve the dynamic performance of foam concrete. The foam concrete’s ductility attained an optimal level at the CF content of 1.5%. The dynamic compressive strengths reached their highest values of 2.27 MPa (at 0.20 MPa gas pressure), 3.18 MPa (at 0.25 MPa gas pressure), and 4.21 MPa (at 0.30 MPa gas pressure) at the CF content of 1.5%. The peak values of energy absorption were 8.9 J (at 0.20 MPa gas pressure) at a CF content of 2.0%, 14.9 J (at 0.25 MPa gas pressure) at a CF content of 1.5%, and 22.4 J (at 0.30 MPa gas pressure) at a CF content of 1.5%, respectively. However, this improvement would deteriorate when CF was in excess.

泡沫混凝土作为一种新型建筑材料，因其高能量吸收能力和低密度而备受关注。但是，泡沫混凝土的低强度和韧性差已成为阻碍其进一步应用的障碍。在以前的一些研究中，作为可再生的再生植物纤维的椰壳纤维（CF）在改善水泥基材料的机械性能方面显示出显着的有效性。本文将CF引入泡沫混凝土以提高其动态性能。总共准备了54个CF含量不同（0.0％，0.5％，1.0％，1.5％，2.0％和2.5％）的泡沫混凝土试样，并分为6组。在三种驱动气体压力（0.20、0.25和0）下进行了一次冲击试验。30兆帕）通过分裂霍普金森压力棒实验技术来研究CF含量对泡沫混凝土动力性能的影响，包括破坏模式，动态抗压强度，应力应变行为和能量吸收能力。此外，为解释CF泡沫混凝土的变化机理，通过扫描电子显微镜和X射线衍射进行了微观结构分析。结果表明，适量的CF可以显着改善泡沫混凝土的动力性能。当CF含量为1.5％时，泡沫混凝土的延展性达到最佳水平。在CF含量为1.5％时，动态抗压强度达到最高值2.27MPa（在0.20MPa气压下），3.18MPa（在0.25MPa气压下）和4.21MPa（在0.30MPa气压下）。CF含量为2.0％时能量吸收的峰值为8.9 J（在0.20 MPa气压下），CF含量为1.5％时的能量吸收的峰值为14.9 J（在0.25 MPa气压下），以及0.30 MPa气压下的22.4 J ）的CF含量分别为1.5％。但是，当CF过量时，这种改进会恶化。