共聚甲醛纤维超高性能水泥基复合材料抗弯性能试验

王春生; 张洋; 段兰

doi:10.13801/j.cnki.fhclxb.20230524.003

共聚甲醛纤维超高性能水泥基复合材料抗弯性能试验

doi: 10.13801/j.cnki.fhclxb.20230524.003

长安大学　公路学院，西安 710064

基金项目: 钢桥疲劳损伤的冷维护方法及长期性能研究(51578073)；长寿命高性能钢桥智能设计、建造与管养创新团队(2019TD-022)

详细信息

通讯作者:
王春生，博士，教授，博士生导师，研究方向为钢桥与组合结构桥梁，桥梁疲劳断裂与长寿命高性能桥梁　E-mail：wcs2000 wcs@163.com

中图分类号: TU528；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-03-15
- 修回日期: 2023-04-02
- 录用日期: 2023-04-22
- 网络出版日期: 2023-05-25
- 刊出日期: 2024-01-01

Flexural performance of ultra-high performance fiber reinforced cementitious composite material doped with copolymer formaldehyde fiber

School of Highway, Chang'an University, Xi'an 710064, China

Funds: Research on Cold Maintenance Methods and Long Term Performance of Steel Bridge Fatigue Damage (51578073); Long Life High Performance Steel Bridge Intelligent Design, Construction, and Management Innovation Team (2019TD-022)

摘要

摘要: 为探究共聚甲醛纤维超高性能水泥基复合材料(UHPFRC)的抗弯力学性能，设计并测试了5组抗弯试件，包括3组纤维单掺型试件和2组纤维混杂型试件。结果表明：共聚甲醛纤维UHPFRC试件中，纤维体积掺量为2vol%时，UHPFRC试件具有更好的抗弯强度，平均强度可达13.4 MPa；适量的共聚甲醛纤维可延缓UHPFRC基体的开裂，增强其裂前变形能力，5组试件中，2vol%共聚甲醛纤维UHPFRC试件的开裂挠度最大，可达0.65 mm；混杂纤维可更好地增强UHPFRC的抗弯强度和韧性，1.5vol%共聚甲醛纤维和1.5vol%钢纤维混掺时，UHPFRC试件抗弯强度可达13.9 MPa，同时该组试件的韧性最好。本文揭示了共聚甲醛纤维在UHPFRC抗弯力学性能方面的作用效果，对其在UHPFRC中的应用及UHPFRC的推广具有重要参考价值。
- 共聚甲醛纤维 /
- 超高性能水泥基复合材料 /
- 抗弯性能 /
- 纤维类型 /
- 纤维掺量
Abstract: In order to investigate the flexural performance of ultra-high performance fiber reinforced cementitious composite material (UHPFRC) doped with copolymer formaldehyde fiber, five groups of bending specimens were designed and tested, including three groups of single mixed specimens and two groups of fiber hybrid specimens. The results show that among the copolymer formaldehyde fiber UHPFRC specimens, 2vol% copolymer formaldehyde fiber UHPFRC specimens have better flexural strength, with an average strength of 13.4 MPa. An appropriate amount of co-formaldehyde fiber can delay the cracking of UHPFRC matrix and enhance its ability to deformation before cracking. Among the five groups of test pieces, the cracking deflection of 2vol% copolymer formaldehyde fiber UHPFRC test piece is the largest, which can reach 0.65 mm. Hybrid fiber can better enhance the flexural strength and toughness of UHPFRC. When 1.5vol% copolymer formaldehyde fiber and 1.5vol% steel fiber are mixed, the flexural strength of UHPFRC specimens can reach 13.9 MPa, and the toughness of this group of specimens is the best. The research reveals the effect of copolymer formaldehyde fiber on the flexural mechanical properties of UHPFRC, which has important reference value for its application in UHPFRC and the promotion of UHPFRC.
- copolymer formaldehyde fiber /
- ultra-high performance fiber reinforced cementitious composite material /
- flexural performance /
- fiber type /
- fiber content

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图 1 超高性能水泥基复合材料(UHPFRC)的扩展度测试

Figure 1. Expansion test of ultra-high performance fiber reinforced cementitious (UHPFRC)

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图 2 数字图像测量技术 (DIC)测试配置

Figure 2. Test configuration of the digital image correlation (DIC) technique

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图 3 各组UHPFRC试件裂缝发展和破坏形态

Figure 3. Crack developments and failure modes of each group of UHPFRC specimens

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图 4 UHPFRC试件荷载-应变曲线

Figure 4. Load-strain curves of UHPFRC specimens

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图 5 UHPFRC试件扩展度

Figure 5. Expansion of UHPFRC specimens

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图 6 UHPFRC试件荷载-挠度曲线

Figure 6. Load-deflection curves of UHPFRC specimens

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图 7 2%POM-0%SF/C、3%POM-0%SF/C试件的断面图对比

Figure 7. Comparison of section diagrams of 2%POM-0%SF/C and 3%POM-0%SF/C specimens

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图 8 UHPFRC试件韧性指数趋势图

Figure 8. Trend diagram of toughness index of UHPFRC specimens

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图 9 UHPFRC试件韧性因子趋势图

Figure 9. Trend diagram of toughness factor of UHPFRC specimens

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表 1 纤维的几何与物理参数

Table 1. Geometrical and physical properties of fibers

Fiber type	Density/(g·cm⁻³)	Diameter/mm	Length/mm	Elastic modulus/GPa	Tensile stress/MPa	Elongation/%
POM	1.40	0.2	12	≥10	≥1000	≤16
SF	7.85	0.2	13	20-25	2850	3.5-4
Notes: POM—Copolymer formaldehyde fiber; SF—Steel fiber.

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表 2 试件分组

Table 2. Specimen grouping

Group	POM content/vol%	SF content/ vol%	Cement/ (kg·m⁻³)	Silica fume/ (kg·m⁻³)	Sand/ (kg·m⁻³)	Sika viscocrete/ (kg·m⁻³)	Beads powder/ (kg·m⁻³)	Water/ (kg·m⁻³)
2%POM-0%SF/C	2	0	904.8	67.9	1258.8	36.8	171.7	165
3%POM-0%SF/C	3	0	904.8	67.9	1258.8	36.8	171.7	165
0%POM-3%SF/C	0	3	904.8	67.9	1258.8	36.8	171.7	165
1%POM-1%SF/C	1	1	904.8	67.9	1258.8	36.8	171.7	165
1.5%POM-1.5%SF/C	1.5	1.5	904.8	67.9	1258.8	36.8	171.7	165
Note: C—Cement.

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表 3 UHPFRC试件的试验结果

Table 3. Test results of the UHPFRC specimens

Group	Slump flaw value/mm	Bending strength/MPa
2%POM-0%SF/C	426	13.4
3%POM-0%SF/C	380	11.6
0%POM-3%SF/C	560	13.9
1%POM-1%SF/C	495	12.9
1.5%POM-1.5%SF/C	460	13.9

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表 4 UHPFRC试件韧性指标计算结果

Table 4. Calculation results of toughness index of UHPFRC specimens

Group	Initial crack deflection/mm	Toughness index^[29]			T_b	Toughness factor/MPa
Group	Initial crack deflection/mm	$ {I_5} $	$ {I_{10}} $	$ {I_{20}} $	T_b	Toughness factor/MPa
2%POM-0%SF/C	0.65	3.77	7.34	12.96	7.30	4.38
3%POM-0%SF/C	0.41	3.52	7.81	17.39	8.40	5.04
0%POM-3%SF/C	0.48	5.52	10.27	16.47	11.93	7.16
1%POM-1%SF/C	0.49	4.15	7.98	13.69	10.80	6.48
1.5%POM-1.5%SF/C	0.56	4.84	10.03	16.87	11.95	7.17
Notes: T_b—The area under the load-deflection curve corresponding to the mid-span deflection reaching L/150 (N·mm); I₅, I₁₀, I₂₀—The ratio of the area under the load-deflection curve corresponding to deflections of 3, 5.5, and 10.5 times the initial cracking deflection to the area under the load-deflection curve corresponding to the initial cracking deflection.

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