Effect of BFRP mesh cloth on bonding properties of ultra-high performance concrete
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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。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.
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Key words:
- 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
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)
图 9 切向剪切试验图
Figure 9. Single shear experimental setup
LVDT—Linear variable differential transformer
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
ti (i=1,2,3)—Thicknesses of BFRP mesh cloth t1—0.85 mm; t2—1.16 mm; t3—1.45 mm
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)
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)
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)
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
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
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
图 20 BFRP-UHPC剪应力-滑移量关系曲线
Figure 20. Slip-shear stress relationship curves of BFRP-UHPC
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
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
/MPaElastic modulus
/GPaInitial 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/mmMass/
(g·m−2)Mesh size
/mmElastic modulus
/MPaElongation
/%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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