BFRP网格布对超高性能混凝土粘结性能的影响

殷雨时; 苏庆田; 张冠华

doi:10.13801/j.cnki.fhclxb.20220819.002

BFRP网格布对超高性能混凝土粘结性能的影响

doi: 10.13801/j.cnki.fhclxb.20220819.002

殷雨时^{1, 2,},
苏庆田^1, ,,
张冠华²

1.
同济大学　土木工程学院，上海 200092
2.
辽宁省交通规划设计院有限责任公司，沈阳 110166

基金项目: 国家自然科学基金(51978501；51774163)

详细信息

通讯作者:
苏庆田，博士，教授，研究方向为桥梁界面力学和钢桥加固技术　E-mail：sqt@tongji.edu.cn

中图分类号: TU745.39
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- 文章访问数: 187
- HTML全文浏览量: 168
- 被引次数: 0
出版历程
- 收稿日期: 2022-06-15
- 修回日期: 2022-07-16
- 录用日期: 2022-08-03
- 网络出版日期: 2022-08-22

Effect of BFRP mesh cloth on bonding properties of ultra-high performance concrete

YIN Yushi^{1, 2
,},
SU Qingtian^{1
, ,},
ZHANG Guanhua²

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Liaoning Provincial Transportation Planning and Design Institute CO., LTD., Shenyang 110166, China

Funds: National Natural Science Foundation of China (51978501; 51774163)

摘要

摘要: 为分析玄武岩纤维增强树脂复合材料(BFRP)网格布对超高性能混凝土(UHPC)粘结性能的影响，以干/湿粘结类型、BFRP网格布锚固深度和网格布厚度3个参数，分别开展BFRP-UHPC界面正拉粘结试验(48块)和切向剪切试验(21块)，研究了BFRP网格布对其与UHPC界面破坏模态、粘结性能、剪应力-滑移曲线、拉伸比和韧性的影响，同时利用SEM，揭示BFRP-UHPC界面破坏机制。结果表明：锚固深度直接决定BFRP-UHPC界面破坏模式；法向粘结应力和切向粘结应力在界面变化规律上具有正向相关性；BFRP-UHPC界面湿粘结强度高于干粘结工艺水平；随着BFRP厚度和锚固深度逐渐增加，BFRP与UHPC界面粘结应力均呈现逐渐减小的规律；钢纤维对BFRP-UHPC界面增韧效果显著，其端勾构造使UHPC损伤后仍具有残余刚度和强度；当BFRP锚固深度为5 mm时，此时界面粘结应力达到最大，正拉粘结试验中粘结应力最大提升幅度达到74%，拉伸强度比高达1.74。
- 超高性能混凝土 /
- BFRP /
- 湿粘结 /
- 干粘结 /
- 正拉粘结试验 /
- 切向剪切试验 /
- 界面
Abstract: In order to analyze the influence of basalt fiber reinforced polymer (BFRP) mesh on the bonding performance of ultra-high performance concrete (UHPC), the BFRP-UHPC interface pull-out bonding test (48 pieces) and shear test (21 pieces) were carried out respectively with three parameters of dry/wet bonding type, BFRP mesh anchorage depth and mesh thickness. The effects of BFRP mesh on the failure mode, bonding performance, shear stress slip curve, tensile ratio and toughness were studied. At the same time, the failure mechanism of BFRP-UHPC interface was revealed by SEM. The results show that the anchoring depth directly determines the failure mode of BFRP-UHPC interface. There is a positive correlation between tangential bonding stress and normal bonding stress. The wet bonding strength of BFRP-UHPC interface is higher than that of dry bonding process. With the increase of BFRP thickness and anchorage depth, the interfacial bonding stress between BFRP and UHPC shows a decreasing trend. Steel fiber has remarkable toughening effect on BFRP-UHPC interface, its end hook structure makes UHPC still have residual stiffness and strength after damage. When the anchoring depth of BFRP is 5 mm, the interface bonding stress reaches the maximum, the maximum increase of interface in the pull out bonding stress reaches 74%, and the tensile strength ratio is 1.74.
- ultra-high performance concrete /
- BFRP /
- wet bonding /
- dry bonding /
- pull-out test /
- shear test /
- interface

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图 1 玄武岩纤维增强树脂复合材料(BFRP)网格布

Figure 1. Basalt fiber reinforced polymer (BFRP) mesh cloth

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图 2 BFRP网格布粘贴区域示意图

Figure 2. Schematic diagram of BFRP mesh cloth paste area

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图 3 湿粘结BFRP网格锚固深度(上：一侧锚固深度T为20 mm；下：另一侧锚固深度T为20 mm)

Figure 3. Anchoring depth of wet bonded BFRP mesh (Up: 20 mm anchoring depth T on one side; Down: 20 mm anchoring depth T on the other side)

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图 4 正拉粘结待做试件

Figure 4. Pull-out bond test specimens to be tested

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图 5 BFRP-UHPC正拉粘结试验

Figure 5. BFRP-UHPC pull out bond test

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图 6 UHPC试件尺寸

Figure 6. UHPC size figure

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图 7 切向剪切试件纵向示意图

Figure 7. Longitudinal schematic of shear test specimen

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图 8 粘结区域及应变片俯视图

Figure 8. Area of test concrete to be tested

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图 9 切向剪切试验图

Figure 9. Single shear experimental setup

LVDT—Linear variable differential transformer

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图 10 BFRP-UHPC正拉试验干粘结破坏形态

Figure 10. Failure mode of dry bond in pull-out test of BFRP-UHPC

t_i (i=1,2,3)—Thicknesses of BFRP mesh cloth t₁—0.85 mm; t₂—1.16 mm; t₃—1.45 mm

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图 11 BFRP-UHPC湿粘结界面破坏形态

Figure 11. Wet bonding interface destroyed performance of BFRP-UHPC

a-b at the bottom left of the figure: a—BFRP mesh cloth has three thicknesses (1—0.85 mm; 2—1.16 mm; 3—1.45 mm); b—Three anchoring depths of BFRP mesh cloth (5—5 mm; 15—15 mm; 20—20 mm)

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图 12 BFRP-UHPC切向剪切试验破坏模式(干粘结)

Figure 12. Tangential shear test failure mode of BFRP-UHPC (Dry bonding)

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图 13 BFRP-UHPC切向剪切试验破坏模式(湿粘结)

Figure 13. Tangential shear test failure mode of BFRP-UHPC (Wet bonding)

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图 14 BFRP单筋轴拉试验

Figure 14. Axial tension test of BFRP single rib

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图 15 BFRP单筋荷载-应变关系曲线

Figure 15. Strain load relation curves of BFRP single rib

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图 16 干粘结工艺下BFRP-UHPC界面粘结强度随网格厚度变化

Figure 16. Variation of interface bond strength with mesh thickness of BFRP-UHPC under dry bond process

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图 17 BFRP-UHPC干、湿粘结工艺下界面粘结强度对比

Figure 17. Comparison of interfacial bond strength of BFRP-UHPC under dry and wet bond process

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图 18 BFRP-UHPC粘结区域应变变化

Figure 18. Strain change in bonding area of BFRP-UHPC

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图 19 BFRP-UHPC粘结区域剪应力变化

Figure 19. Shear stress change in bonding area of BFRP-UHPC

P—Interface load

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图 20 BFRP-UHPC剪应力-滑移量关系曲线

Figure 20. Slip-shear stress relationship curves of BFRP-UHPC

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图 21 BFRP-UHPC界面拉伸强度及拉伸强度比

Figure 21. Interfacial tensile strength and tensile-strength ratio of interface between BFRP and UHPC

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图 22 玄武岩纤维丝在胶体中形貌

Figure 22. Morphology of BFRP filament in colloid

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图 23 玄武岩纤维丝在胶体中脱粘

Figure 23. Debonding of BFRP filament in colloid

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图 24 钢纤维丝在UHPC中形貌

Figure 24. Morphology steel fiber in UHPC

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图 25 钢纤维丝链接UHPC分离混凝土

Figure 25. Steel fiber link UHPC between separation concrete

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表 1 超高性能混凝土(UHPC)配合比(相对质量比)

Table 1. Ultra-high performance concrete (UHPC) mix proportion (Relative mass ratio)

Portland cement	Silica fume	Water	Water reducer	Steel fiber	Fine sand	Crushed stone	W/C
1	0.225	0.225	0.017	0.177	0.900	0.225	0.184
Notes: W—Water; C—Cement.

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表 2 UHPC力学性能

Table 2. Mechanical properties of UHPC

Item	Compressive strength /MPa	Elastic modulus /GPa	Initial crack strength/MPa
UHPC	136	40.2	8.3

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表 3 其他材料性能参数

Table 3. Performance parameters of other materials

Designation	Tensile strength/MPa	Thickness t₁, t₂, t₃/mm	Mass/ (g·m^-²)	Mesh size /mm	Elastic modulus /MPa	Elongation /%
BFRP	1848, 2887, 5377	0.85, 1.16, 1.45	200/372/582	5×5	81500, 82300, 83100	2.76, 2.88, 2.97
Colloid	38	—	—	—	2.4×10³	—
Steel colloid	30	—	—	—	1.2×10⁴	—

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表 4 BFRP-UHPC切向剪切试验数据值

Table 4. Shear test values of BFRP-UHPC

Designation	Series	$ {p_{\text{u}}} $/kN	$ {\tau _{\text{u}}} $/MPa	$ {s_{\text{u}}} $/mm
	DB	9.81	7.02	1.48
t=0.85 mm	WB-5	19.88	14.23	3.00
	WB-15	16.65	12.00	2.60
	WB-20	14.00	11.02	2.20
h=15 mm	WB0.85	16.65	12.00	2.60
	WB1.16	15.35	11.06	2.40
	WB1.45	16.22	11.69	2.53
Notes: $ {p_{\text{u}}} $—Interface ultimate load; $ {\tau _{\text{u}}} $—Interfacial adhesion strength; $ {s_{\text{u}}} $—Local maximum slip value of the interface; DB—Adhesion; WB—Wet bonding; WB-a—Anchorage depth of mesh cloth under wet bonding condition; WBb—Thickness of mesh cloth under wet bonding condition; h—Anchorage depth.

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