基于纤维桥接与钙离子调控的水泥−水玻璃固结体韧性增强机制研究

冯啸; 侯本敖; 孙文; 杨文达; 石振中; 张石磊; 李美玲

doi:10.20265/j.cnki.issn.1007-2993.2025-0202

基于纤维桥接与钙离子调控的水泥−水玻璃固结体韧性增强机制研究

doi: 10.20265/j.cnki.issn.1007-2993.2025-0202

1.
山东建筑大学交通工程学院，山东济南　250101
2.
内蒙古引绰济辽供水有限责任公司，内蒙古兴安盟　137499

基金项目: 国家自然科学青年基金（52009075）；山东省自然科学青年基金（ZR2020QE262）；山东省自然科学面上基金（ZR2024ME119）

详细信息

作者简介:
冯　啸，男，1988年生，博士，副教授，主要从事地下工程灾害防控的研究。E-mail：fengxiao19@sdjzu.edu.cn

中图分类号: TU441
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- 文章访问数: 30
- HTML全文浏览量: 11
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2025-05-05
- 修回日期: 2025-09-16
- 录用日期: 2025-11-11
- 网络出版日期: 2026-10-08
- 刊出日期: 2026-10-08

Toughness enhancement mechanism of cement-sodium silicate composites based on fiber bridging and calcium ion regulation

1.
School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China
2.
Inner Mongolia Yin Chao Ji Liao Water Supply Co., Ltd., Hinggan League 137499, Nei Mongol, China

摘要

摘要: 在实际工程中，水泥−水玻璃（C-S）固结体因韧性不足，难以有效吸收动态载荷能量。为解决这一问题，提出CaO-EG-PP三元协同改性体系，通过调控钙离子浓度与聚丙烯纤维桥接作用，系统研究不同配比（0%～5%氧化钙（CaO）、0.04%乙二醇（EG）、0%～1%聚丙烯纤维（PP））对C-S固结体力学性能的影响，结合凝结时间、抗压强度、折压比、拉压比及抗冲击试验，揭示其韧性增强机制。结果表明，体积比（V_c∶V_s）由2∶1增至5∶1时，凝结时间缩短41.2%～ 54.2%；CaO（1%）+ EG（0.04%）组在PP掺量0.2%时抗压强度达6.75 MPa（较对照组提升13.4%），且弹性模量同步提高36.1%；CaO（3%）+ EG（0.04%）组拉压比较对照组提升5.4%～104.1%，PP桥接作用使完全开裂冲击耗能提升至147.15 J（对照组39.24 J）。研究表明，钙离子浓度优化平衡硅氧四面体电荷密度以稳定凝胶结构，EG氢键强化界面结合，纤维桥接与拓扑缠绕抑制微裂缝扩展，三者协同实现“离子调控−氢键稳定−纤维增韧”耦合增强。
- 双液浆 /
- 纤维桥接 /
- 拉压比 /
- 抗冲击性能 /
- 韧性 /
- 力学性能
Abstract: Cement-sodium silicate (C-S) grout struggles to effectively absorb dynamic load energy in practical engineering due to insufficient toughness. To address this problem, a ternary synergistic modification system of CaO-EG-PP was proposed. By regulating calcium ion concentration and the bridging effect of polypropylene (PP) fibers, the effects of different mixing ratios (0%~5% calcium oxide (CaO), 0.04% ethylene glycol (EG), 0%~1% PP fibers) on the mechanical properties of C-S consolidates are investigated. Combined with experiments on setting time, compressive strength, flexural-compressive strength ratio, tensile-compressive strength ratio and impact resistance, the toughness enhancement mechanism is revealed. The results show that when the volume ratio (V_c∶V_s) increases from 2∶1 to 5∶1, the setting time is shortened by 41.2%~54.2%. For the group with 1% CaO + 0.04% EG, the compressive strength reaches 6.75 MPa at a PP fiber content of 0.2%, which is 13.4% higher than that of the control group, and the elastic modulus increases by 36.1% simultaneously. The tensile-compressive strength ratio of the group with 3% CaO + 0.04% EG is increased by 5.4%~104.1% compared with the control group, and the PP fiber bridging effect raises the impact energy consumption at complete cracking to 147.15 J (39.24 J for the control group). The study indicates that optimized calcium ion concentration balances the charge density of silicate tetrahedra to stabilize the gel structure, ethylene glycol strengthens interfacial bonding via hydrogen bonds, and fiber bridging together with topological entanglement inhibits microcrack propagation. The three components synergistically realize the coupled enhancement of ion regulation-hydrogen bond stabilization-fiber toughening.
- cement-sodium silicate slurry couple /
- fiber bridging /
- tensile-to-compressive ratio /
- impact resistance test /
- toughness /
- mechanical properties

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图 1 拉伸试件形状及尺寸

Figure 1. Shape and dimensions of tensile test specimens

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图 2 倒杯法测凝结时间示意及数据图

Figure 2. Schematic diagram and data graph of setting time measured by the pouring cup method

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图 3 抗压强度试验示意图

Figure 3. Schematic diagram of compressive strength experiment

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图 4 30°Bé抗压强度及弹性模量数据图

Figure 4. Data graph of compressive strength and elastic modulus at 30°Bé

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图 5 20°Bé抗压强度及弹性模量数据图

Figure 5. Data graph of compressive strength and elastic modulus at 20°Bé

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图 6 抗折试验示意图

Figure 6. Schematic diagram of flexural test

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图 7 体积比2∶1 30°Bé 7 d折压比

Figure 7. Volume ratio 2 to 1, 30° Bé, 7 d flexural-compression ratio

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图 8 体积比5∶1 30°Bé 7 d折压比

Figure 8. Volume ratio 5 to 1, 30° Bé, 7 d flexural-compression ratio

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图 9 ECC拉伸试验示意图

Figure 9. Schematic diagram of ECC tensile test

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图 10 ECC拉压比数据图

Figure 10. Data graph of tension-compression ratio of ECC

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图 11 抗冲击试验示意图

Figure 11. Schematic diagram of impact resistance experiment

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图 12 机理分析示意图

Figure 12. Schematic diagram of mechanism analysis

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表 1 乙二醇技术指标

Table 1. Technical indicators of ethylene glycol

C₂H₆O₂含量 /%	密度(20 ℃) /(g∙cm⁻³)	相对分子含量	水分/%	灼烧残渣/%	酸度（以H⁺含量计） /(mmol∙g⁻¹)	硫酸盐含量/%
≥99.5	1.112～1.115	62.07	0.2	0.005	0.001	0.002

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表 2 材料配比

Table 2. Material ratio

水平	因素
水平	CaO的掺量/%+EG的掺量/%	PP的掺量/%
1	0.00（0 g）+0.00（0.0 g）	0.0（0 g）
2	1.00（10 g）+0.04（0.4 g）	0.2（2 g）
3	3.00（30 g）+0.04（0.4 g）	0.6（6 g）
4	5.00（50 g）+0.04（0.4 g）	1.0（10 g）

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表 3 试验方案

Table 3. Experimental plan

编号	CaO的掺量/%+ EG的掺量/%	PP的掺量/%	编号	CaO的掺量/%+ EG的掺量/%	PP的掺量/%
1	0+0.00	0.0	9	3+0.04	0.0
2	0+0.00	0.2	10	3+0.04	0.2
3	0+0.00	0.6	11	3+0.04	0.6
4	0+0.00	1.0	12	3+0.04	1.0
5	1+0.04	0.0	13	5+0.04	0.0
6	1+0.04	0.2	14	5+0.04	0.2
7	1+0.04	0.6	15	5+0.04	0.6
8	1+0.04	1.0	16	5+0.04	1.0

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表 4 抗冲击性能

Table 4. Impact resistance

编号	第一条可视裂缝		完全开裂		编号	第一条可视裂缝		完全开裂
编号	次数	W₁冲击耗能/J	次数	W₂冲击耗能/J	编号	次数	W₁冲击耗能/J	次数	W₂冲击耗能/J
1	2	19.62	4	39.24	9	1	9.81	2	19.62
2	2	19.62	5	49.05	10	4	39.24	7	68.67
3	3	29.43	4	39.24	11	1	9.81	2	19.62
4	6	58.86	11	107.91	12	4	39.24	7	68.67
5	9	88.29	10	98.10	13	3	29.43	4	39.24
6	11	107.91	15	147.15	14	1	9.81	3	29.43
7	9	8.29	14	137.34	15	2	19.62	4	39.24
8	3	29.43	5	49.05	16	2	19.62	10	98.10

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