聚丙烯纤维对混凝土损伤渗透特性的影响

段明翰; 覃源; 许增光; 马伟丽

doi:10.13801/j.cnki.fhclxb.20201223.001

聚丙烯纤维对混凝土损伤渗透特性的影响

doi: 10.13801/j.cnki.fhclxb.20201223.001

西安理工大学　水利水电学院，西安 710048

基金项目: 国家自然科学基金优秀青年科学基金(51922088)

详细信息

通讯作者:
覃源，博士，副教授，研究方向为纤维混凝土　 E-mail：qinyuan@xaut.edu.cn

中图分类号: TU528
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出版历程
- 收稿日期: 2020-10-19
- 录用日期: 2020-12-10
- 网络出版日期: 2020-12-23
- 刊出日期: 2021-10-01

Effect of polypropylene fiber on the damage and permeability of concrete

Faculty of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China

Funds: The National Natural Science Foundation for Excellent Young Scientists of China (51922088)

摘要

摘要: 为研究损伤开裂后聚丙烯纤维/混凝土(PPF/PC)的渗透特性，通过圆盘劈裂试验预制了不同宽度的裂缝(100~400 μm)，比较了PPF掺量对裂缝曲折度的影响。利用自行设计的渗透试验装置对混凝土损伤后的渗透率进行了研究，分析了不同PPF掺量、不同水压力下混凝土的损伤渗透率的变化规律。通过研究发现，加入PPF后，混凝土脆性较低，内部裂缝更易控制，裂缝曲折度相对于PC更高，且与PPF掺量成正比；相同水压力，相同有效裂缝宽度条件下，随着PPF掺量的增加，混凝土损伤渗透率降低，PPF的存在能够有效提高混凝土损伤后的抗渗性能；相同水压力下，相同PPF掺量的混凝土试件损伤渗透率整体上与有效裂缝宽度成正比；不同水压力下，相同PPF掺量的PPF/PC损伤渗透率在同一有效裂缝宽度情况下，随水压力增加而减小；修正后的泊肃叶渗流模型可以更好地评价PPF/PC损伤渗透特性。
- 聚丙烯纤维/混凝土 /
- 损伤 /
- 纤维掺量 /
- 曲折度 /
- 水压力 /
- 渗透特性
Abstract: In order to study the permeability characteristics of polypropylene fiber reinforced concrete (PPF/PC) after damage and cracking, cracks with different width (100-400 μm) were prefabricated by disc splitting test, and the influence of PPF content on the crack tortuosity was compared. The permeability of concrete after damage was studied by using a self-designed permeability test device, and the change law of damage permeability of the concrete under different fiber contents and water pressures was analyzed. It is found that after adding PPF, the brittleness of concrete is lower, the internal cracks are easier to control, the crack tortuosity is higher than the ordinary concrete (PC), and is proportional to the fiber content; under the same water pressure and the same effective crack width, with the increase of PPF content, the damage permeability of concrete decreases, and the existence of fiber can effectively improve the impermeability of concrete after damage. Under the same water pressure, the damage permeability of concrete specimens with the same amount of PPF is directly proportional to the effective crack width; under different water pressures, the damage permeability of PPF/PC with the same PPF content decreases with the increase of water pressure under the same effective crack width; the modified Poiseuille model can better evaluate the damage and permeability characteristics of PPF/PC.
- polypropylene fiber/plain concrete /
- damage /
- fiber content /
- tortuosity /
- water pressure /
- permeability

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图 1 聚丙烯纤维(PPF)外观形状

Figure 1. Appearance of polypropylene fiber (PPF)

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图 2 劈裂试验装置简图

Figure 2. Schematic diagram of splitting test device

LVDT—Linear variable differential transformer

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图 3 聚丙烯纤维/混凝土(PPF/PC)有效裂缝宽度测量^[18]

Figure 3. Measurement of effective crack width of polypropylene fiber reinforced concrete (PPF/PC) ^[18]

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图 4 IPP软件测量PPF/PC裂缝长度

Figure 4. Crack length of PPF/PC measured by IPP software

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图 5 损伤渗透试验装置简图^[18]

Figure 5. Schematic diagram of damage penetration test facility^[18]

1—Pressure gauge; 2—Water pipe; 3—Valve; 4—Vent hole; 5—Top cover; 6—Six bolts; 7—Thin-walled annular sleeve; 8—Concrete specimen; 9—Support sleeves wall; 10—Water flows collector; 11—Bottom covers; 12—Water outlet; 13—Measuring cup; 14—Steel support bases

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图 6 损伤渗透试验原理图

Figure 6. Schematic diagram of damage penetration test

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图 7 PPF/PC表面裂缝宽度

Figure 7. Surface crack width of PPF/PC

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图 8 PPF/PC裂缝形态对比

Figure 8. Fracture morphology comparison of PPF/PC

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图 9 聚丙烯纤维对PPF/PC曲折度的影响

Figure 9. Effect of polypropylene fiber on tortuosity of PPF/PC

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图 10 聚丙烯纤维掺量对PPF/PC损伤渗透率的影响

Figure 10. Effect of polypropylene fiber content on permeability of PPF/PC

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图 11 水压力对PPF/PC损伤渗透率的影响

Figure 11. Effect of water pressure on damage permeability of PPF/PC

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图 12 损伤渗透率与有效裂缝宽度关系曲线(以0.9 kg/m³纤维掺量PPF/PC为例)

Figure 12. Relationship between damage permeability and effective crack width (Take PPF/PC with 0.9 kg/m³ fiber content as an example)

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表 1 PPF性能参数

Table 1. Physical properties of PPF

Shape	Density/(g·cm⁻³)	Length/mm	Diameter/μm	Tensile strength/MPa	Elastic modulus/MPa	Elongation at break/%
Bundle shape	0.91	19	31.2	565	5900	27

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表 2 混凝土基准配合比及抗压强度

Table 2. Basic mix design and compressive strength of concrete

Specimen	Water/ (kg·m⁻³)	Cement/ (kg·m⁻³)	Fly ash/ (kg·m⁻³)	Fine aggregate/ (kg·m⁻³)	Coarse aggregate/ (kg·m⁻³)	Admixture/ (kg·m⁻³)	Fiber content/ (kg·m⁻³)	Strength/ MPa
PC	135	275	90	815	1 080	10	0	33.29
PPF/PC	135	275	90	815	1 080	10	0.6	35.79
							0.9	39.20
							1.2	36.83
							1.5	35.03
Note: PC—Plain concrete.

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表 3 PPF/PC泊肃叶渗流模型修正系数$\xi $取值

Table 3. Poiseuille flow model correction coefficient $\xi $ values of PPF/PC

Water pressure/MPa	Correction coefficient $\xi $/Relativity R²	0.6PPF/ PC	0.9PPF/PC	1.2PPF/PC	1.5PPF/PC
0.1	$\xi $	0.0192	0.0214	0.0157	0.0107
0.1	R²	0.9000	0.8882	0.6338	0.7196
0.2	$\xi $	0.0182	0.0158	0.0113	0.0082
0.2	R²	0.8608	0.8123	0.7101	0.5653
0.3	$\xi $	0.0105	0.0139	0.0085	0.0073
0.3	R²	0.6157	0.6984	0.4856	0.6125

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