Fu Xian, Liu Peng, Kong Dewen, Li Yuan, Wang Yongfa
College of Civil Engineering, Guizhou University, Guiyang, Guizhou, China.
PLoS One. 2025 May 23;20(5):e0323011. doi: 10.1371/journal.pone.0323011. eCollection 2025.
Phosphogypsum-based cementitious materials (PGCs) typically exhibit low strength and poor toughness when utilized as construction materials. This study explores the incorporation of raw bamboo fibers of varying lengths into PGCs at different ratios to develop raw bamboo fiber-reinforced phosphogypsum-based composite materials (BFRPGCs). Firstly, the influence of the water-cement ratio on the mechanical properties of BFRPGCs was investigated through a one-factor experimental approach, leading to the identification of an optimal water-cement ratio. Secondly, the effects of the length and content of raw bamboo fibers on the mechanical properties of BFRPGCs at this optimal water-cement ratio were examined, along with an exploration of the mechanisms by which raw bamboo fibers impact the mechanical properties of the composites, considering their damage modes. Finally, the microstructure of BFRPGCs was analyzed using scanning electron microscopy (SEM), which elucidated the mechanisms through which raw bamboo fibers influence the working and mechanical properties of the composites. The results demonstrated that the incorporation of raw bamboo fibers significantly enhanced the mechanical strength of the specimens. Specifically, when the length of the bamboo fibers was 12 mm and the doping amount was 1.0%, the compressive and flexural strengths of BFRPGCs reached their maxima at 28.99 MPa and 8.41 MPa, respectively. These values represent increases of 123.73% and 169.82% compared to the control group. Additionally, hydration-generated calcium silicate hydrate (C-S-H) gels and calcium aluminate (AFt) phases formed a skeletal support around the CaSO₄·2H₂O, reinforcing the matrix structure. Furthermore, numerous hydration products adhered to the surfaces of the raw bamboo fibers, resulting in enhanced adhesion between the fibers and the matrix. This study provides valuable insights for the research and application of fiber-reinforced phosphogypsum-based building materials.
磷石膏基胶凝材料（PGCs）用作建筑材料时通常强度较低且韧性较差。本研究探索将不同长度的原竹纤维以不同比例掺入PGCs中，以开发原竹纤维增强磷石膏基复合材料（BFRPGCs）。首先，通过单因素试验方法研究水灰比对BFRPGCs力学性能的影响，从而确定最佳水灰比。其次，研究了在该最佳水灰比下原竹纤维长度和含量对BFRPGCs力学性能的影响，并探讨了原竹纤维影响复合材料力学性能的机制，同时考虑其破坏模式。最后，使用扫描电子显微镜（SEM）分析了BFRPGCs的微观结构，阐明了原竹纤维影响复合材料工作性能和力学性能的机制。结果表明，掺入原竹纤维显著提高了试件的力学强度。具体而言，当竹纤维长度为12 mm且掺杂量为1.0%时，BFRPGCs的抗压强度和抗折强度分别达到最大值28.99 MPa和8.41 MPa。与对照组相比，这些值分别提高了123.73%和169.82%。此外，水化生成的硅酸钙水合物（C-S-H）凝胶和钙矾石（AFt）相在CaSO₄·2H₂O周围形成骨架支撑，增强了基体结构。此外，大量水化产物附着在原竹纤维表面，增强了纤维与基体之间的粘结力。本研究为纤维增强磷石膏基建筑材料的研究和应用提供了有价值的见解。
