Mechanical Properties and Mechanism of Glass Fiber Reinforced Cement Base Filling Cement Mortar
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摘要:
工业废渣的资源化利用是当前材料工程界的一个热点问题。采用玻璃纤维对水泥基充填砂浆力学性能进行增强，通过力学性能测试探讨了纤维掺量及长度对试件强度的影响规律，通过微观实验分析了玻璃纤维的作用机理。实验结果表明，玻璃纤维在水泥基充填砂浆中起到了加筋作用，抗压和抗折强度随纤维掺量增加先上升后降低，掺量为1.2%是强度增长的峰值，中等长度的玻璃纤维对强度的增强最有利；随着玻璃纤维掺量由0增加1.2%，试件的抗剪强度提升了75.7%，且发生剪切破坏时的脆性程度下降，结构完整性提高；玻璃纤维的“桥联作用”增强了水化凝胶体的黏结力和摩擦力，抑制了破坏裂缝的扩展，从而促进了力学性能的改善。本研究可为充填采矿工程的安全建设与玻璃废渣的资源化利用提供重要参考。
Abstract:The resource utilization of industrial waste slag is a hot issue in the field of material engineering. Glass fiber was used to enhance the mechanical properties of cement based filling mortar. Mechanical tests were carried out to explore the influence of fiber content and length on strength and the mechanism of glass fiber was analyzed through microscopic tests. The results show that the compressive and flextural strength of cement-based filling mortar first increases and then decreases with the increasing fiber content due to its reinforcement. The peak value of strength increase is 1.2%, and the middle length of glass fiber is the most beneficial to the strength enhancement. When the glass fiber content increases from 0 to 1.2%, the shear strength of the specimen increases by 75.7%, and the brittleness decreases when shear failure occurs, and the structural integrity is improved. The "bridging effect" of glass fiber enhances the adhesion force and friction force of hydration gel, inhibits the propagation of failure crack, and promotes the improvement of mechanical properties. This study can provide an important reference for the safe construction of backfill mining engineering and the resource utilization of glass waste residue.
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Key words:
- glass fiber /
- backfilling mortar /
- mechanical properties /
- failure mode /
- mechanism
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表 1 尾砂的主要化学成分/%
Table 1. Main chemical composition of test tailings
Al2O3 Fe2O3 MnO MgO CaO SO3 SiO2 TiO2 18.02 1.61 0.32 1.73 2.62 0.22 62.15 0.26 
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表 2 玻璃纤维基本物理性质
Table 2. Basic physical properties of glass fibers
纤维类型 单丝直径/μm 密度/(g/cm3) 延伸率/% 弹性模量/GPa 抗拉强度/MPa 耐酸碱性 分散性 玻璃纤维 8 2.13 39 5.02 398 强 好
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表 3 试件的配合比设计
Table 3. Sample mix ratio design
实验编号 纤维长度/mm 纤维掺量/% F 1 5 0.3 F 2 0.6 F 3 0.9 F 4 1.2 F 5 1.5 F 6 10 0.3 F 7 0.6 F 8 0.9 F 9 1.2 F 10 1.5 F 11 20 0.3 F 12 0.6 F 13 0.9 F 14 1.2 F 15 1.5
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