玄武岩纤维棒水泥基材料韧性及孔隙特征研究

Study on the Toughness and Pore Characteristics of Basalt Fiber Bars Cementitious Materials

摘要:

为探究玄武岩纤维棒（BFB）对水泥基材料韧性及渗透性能的影响机制，分析了BFB直径及掺量对力学性能和渗透性能的影响，并结合CT技术探讨BFB对材料孔隙结构的调控作用。结果表明，较小直径的BFB能够有效降低材料孔隙率，提高抗渗透性能，并显著增强抗折韧性，但对抗压强度略有削弱；而BFB掺量提高，对材料韧性及抗渗透性能均有明显增强作用。当BFB直径为0.2mm、掺量为3.0%时，试件综合性能最优，与不掺BFB相比，抗折强度提升约1.6倍，孔隙率降低36.49%，并表现出多缝开裂与挠曲硬化特性，当BFB直径为0.4mm时，试件整体性能较不掺BFB呈下降趋势。

Abstract:

To investigate the influence mechanism of basalt fiber bars (BFB) on the toughness and permeability of cement-based materials, the effects of BFB diameter and content on mechanical and permeability properties were analyzed. Furthermore, CT imaging technology was employed to explore the regulation of pore structure by BFB. The results indicate that BFB with smaller diameters can effectively reduce porosity, improve impermeability, and significantly enhance flexural toughness, although a slight reduction in compressive strength was observed. Increasing the BFB content further improved both toughness and impermeability. When the BFB diameter was 0.2 mm and the content was 3.0%, the specimens exhibited the best overall performance: flexural strength increased by approximately 1.6 times, porosity decreased by 36.49%, and multi-crack formation along with strain-hardening behavior was observed. In contrast, specimens with a BFB diameter of 0.4 mm showed a general decline in performance compared to those without BFB.