BFRP筋与钢-PVA混杂ECC粘结性能

姜天华; 万聪聪; 颜斌

doi:10.13801/j.cnki.fhclxb.20220819.004

BFRP筋与钢-PVA混杂ECC粘结性能

doi: 10.13801/j.cnki.fhclxb.20220819.004

姜天华^{1, 2, ,},
万聪聪^{1, 2,},
颜斌^{1, 2}

1.
武汉科技大学　城市建设学院，武汉 430065
2.
武汉科技大学　高性能工程结构研究院，武汉 430065

基金项目: 东南沿海工程结构防灾减灾福建省高校工程研究中心基金(201902)

详细信息

作者简介:
姜天华，博士，教授，研究方向为　E-mail: wustjth@163.com

通讯作者:
姜天华，博士，教授，硕士生导师，研究方向为高性能纤维增强聚合物复合材料及其结构　E-mail: wustjth@163.com

中图分类号: TU377.9+4；TB333
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出版历程
- 收稿日期: 2022-06-06
- 修回日期: 2022-07-29
- 录用日期: 2022-08-03
- 网络出版日期: 2022-08-22
- 刊出日期: 2023-06-15

Adhesion properties of BFRP reinforcement and steel-PVA hybrid ECC

JIANG Tianhua^{1, 2
, ,},
WAN Congcong^{1, 2
,},
YAN Bin^{1, 2}

1.
School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
2.
Institute of High Performance Engineering Structure, Wuhan University of Science and Technology, Wuhan 430065, China

Funds: Southeast Coastal Engineering Structure Disaster Prevention and Mitigation Fujian Provincial University Engineering Research Center Fund Project (201902)

摘要

摘要: 为研究玄武岩纤维增强树脂复合材料(BFRP)筋与钢-聚乙烯醇混杂纤维增强水泥基复合材料(钢-PVA混杂ECC)的粘结性能，进行系列试验研究与分析。研究表明：在试验钢纤维掺量范围内，钢纤维掺量对试件的力学性能和界面粘结性能均为正面影响，钢-PVA混杂ECC试件的立方体抗压强度随钢纤维掺量增加而增大，增加钢纤维掺量可显著提高BFRP筋与钢-PVA混杂ECC的粘结强度；在试验BFRP筋直径及锚固长度范围内，BFRP筋直径及锚固长度对试件的界面粘结性能均为负面影响，增大BFRP筋直径及锚固长度，BFRP筋与钢-PVA混杂ECC试件的粘结强度均有不同程度的降低。中心拉拔试件粘结强度基本都在5~12 MPa之间。其中，采用0.9vol%钢纤维掺量，BFRP筋直径为8 mm及锚固长度为5d (d为 BFRP 筋的直径)的试件粘结强度最大，为16.82 MPa；而未掺加钢纤维，BFRP筋直径为12 mm及锚固长度为5d的试件粘结强度最小，为5.46 MPa。中心拉拔试件破坏模式分为BFRP筋拔出破坏和BFRP筋拔出-钢-PVA混杂ECC劈裂破坏(拔出-劈裂破坏)，所有试件基本都为BFRP筋拔出破坏，仅有少量试件为拔出-劈裂破坏，且只有拔出-劈裂破坏的试件表面与BFRP筋接触部分出现破碎现象。采用四段式(微滑移段、滑移段、下降段和残余段)表达式建立的粘结-滑移模型可以较准确反映BFRP筋与钢-PVA混杂ECC的粘结滑移全过程。基于试验实测粘结强度和抗压强度值，建立了可计算BFRP筋基本锚固长度的表达式。
- BFRP筋 /
- 钢纤维 /
- 聚乙烯醇纤维 /
- ECC /
- 粘结性能 /
- 粘结-滑移模型
Abstract: In order to study the adhesion properties of basalt fiber reinforced composites (BFRP) ribs and steel-polyvinyl alcohol hybrid fiber reinforced cement matrix composites (steel-PVA mixed ECC), a series of experimental studies and analysis were carried out. The results show that in the range of test steel fiber doping, the mechanical properties and interfacial adhesion properties of the steel fiber doping have a positive effect on the mechanical properties and interfacial adhesion properties of the specimen, and the cubic compressive strength of the steel-PVA hybrid ECC specimen increases with the increase of the amount of steel fiber, and the increase of the steel fiber doping can significantly improve the bonding strength of the BFRP rib and the steel-PVA hybrid ECC; In the test BFRP rib diameter and anchor length range, the diameter of the BFRP rib and the anchoring length have a negative impact on the interfacial bonding performance of the specimen, which increases the diameter of the BFRP rib and the anchoring length. The bond strength of BFRP ribs and steel-PVA hybrid ECC specimens has been reduced to varying degrees. The bond strength of the central pull specimen is basically between 5 and 12 MPa. Among them, the specimen with 0.9vol% steel fiber doping, BFRP rib diameter of 8 mm and anchor length of 5d has the largest bonding strength of 16.82 MPa, while the specimen with unaddressed steel fiber, BFRP rib diameter of 12 mm and anchor length of 5d has the smallest bonding strength, which is 5.46 MPa. The central pull specimen failure mode is divided into BFRP rib extraction failure and BFRP tendon extraction-steel-PVA mixed ECC cleavage failure (pulling-splitting failure), all specimens are basically BFRP rib extraction failure, only a small number of specimens are pulled out-cleavage failure, and only the surface of the specimen with the pull-split failure is broken in contact with the BFRP tendon. The bond-slip model established by using four-stage expressions (micro-slip section, slip section, descending section and residual section) expression can accurately reflect the bonding slip process of BFRP rib and steel-PVA mixed ECC. Based on the measured bond strength and compressive strength values of the test, an expression is established to calculate the basic anchor length of the BFRP rib.
- BFRP reinforcement /
- steel fibres /
- polyvinyl alcohol fibres /
- ECC /
- bonding performance /
- bonding-slip model

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图 1 中心拉拔试件示意图

Figure 1. Schematic diagram of the central pull specimen

d—Diameter of the BFRP rib anchorage length; PVC—Polyvinyl chloride

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图 2 中心拉拔试验装置

Figure 2. Central pull-out test device

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图 3 钢纤维掺量对BFRP筋增强钢-聚乙烯醇(PVA)混杂ECC抗压强度的影响

Figure 3. Effect of steel fiber doping on compressive strength of BFRP reinforced steel-polyvinyl alcohol (PVA) hybrid ECC

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图 4 钢纤维掺量对BFRP筋增强钢-PVA混杂ECC界面粘结强度的影响

Figure 4. Effect of steel fiber doping on interfacial bond strength of BFRP reinforced steel-PVA hybrid ECC

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图 5 BFRP筋直径对BFRP筋增强钢-PVA混杂ECC界面粘结强度的影响

Figure 5. Effect of BFRP rib diameter on interfacial bond strength of BFRP reinforced steel-PVA hybrid ECC

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图 6 BFRP筋锚固长度对BFRP筋增强钢-PVA混杂ECC界面粘结强度的影响

Figure 6. Effect of BFRP rib anchorage length on interfacial bond strength of BFRP reinforced steel-PVA hybrid ECC

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图 7 BFRP筋增强钢-PVA混杂ECC中心拉拔试件破坏模式

Figure 7. Center pull specimen destruction mode of BFRP reinforced steel-PVA hybrid ECC

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图 8 不同参数下BFRP筋增强钢-PVA混杂ECC中心拉拔试件粘结-滑移曲线

Figure 8. Bonding-slip curves of BFRP reinforced steel-PVA mixed ECC center pull specimen under different parameters

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图 9 BFRP筋增强钢-PVA混杂ECC试验曲线与拟合曲线对比

Figure 9. Comparison of test curves and fitted curves of BFRP reinforced steel-PVA hybrid ECC

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图 10 BFRP筋增强钢-PVA混杂ECC粘结应力传递示意图

Figure 10. Schematic diagram of bond stress transfer of BFRP reinforced steel-PVA hybrid ECC

l_a—Anchorage length of BFRP bars; τ—Bond strength; A_B—Cross-sectional area of BFRP bars; f_B—Tensile stress of BFRP bars

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图 11 BFRP筋增强钢-PVA混杂ECC粘结强度与抗压强度的非线性关系

Figure 11. Nonlinear relationship between bond strength and compressive strength of BFRP reinforced steel-PVA hybrid ECC

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表 1 纤维各项性能指标

Table 1. Fiber performance indicators

Fiber	Type	Length/ mm	Diameter/ μm	Elastic modulus/ GPa	Tensile strength/ MPa	Elongation/ %	Density/ (g·cm⁻³)
PVA fiber	Bundled	12	40	42	1600	7	1.3
Steel fiber	Wave type	13	200	220	3000	3-5	7.5
Note: PVA—Polyvinyl alcohol.

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表 2 玄武岩纤维增强树脂复合材料(BFRP)筋基本力学性能

Table 2. Basalt fiber reinforced plastics (BFRP) muscle basic mechanics performance

Diameter/mm	Tensile strength/MPa	Elastic modulus/GPa	Elongation/%	Density/(g·cm⁻³)
8	1462.24±61.52	57.61±1.08	2.64±0.75	1.98±0.58
10	1248.49±102.56	54.68±2.25	2.73±0.55	2.07±0.22
12	1294.46±82.53	56.52±1.52	2.81±0.14	2.01±0.45

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表 3 工程水泥基复合材料(ECC)配合比

Table 3. Engineering cementitious composites (ECC) mix ratio

Cement/(kg·m⁻³)	Fly ash/(kg·m⁻³)	Sand/(kg·m⁻³)	Water reducer/(kg·m⁻³)	Water/(kg·m⁻³)	PVA fiber/vol%
393	865	457	5	311	1.5

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表 4 中心拉拔试件编号参数汇总

Table 4. Summary of central pull specimen number parameters

BFRP bar		Steel fiber doping/vol%
Diameter/mm	Anchorage length/mm	0	0.3	0.6	0.9
8	5d	S0-8-5d	S0.3-8-5d	S0.6-8-5d	S0.9-8-5d
10	2.5d	S0-10-2.5d	S0.3-10-2.5d	S0.6-10-2.5d	S0.9-10-2.5d
	5d	S0-10-5d	S0.3-10-5d	S0.6-10-5d	S0.9-10-5d
	7.5d	S0-10-7.5d	S0.3-10-7.5d	S0.6-10-7.5d	S0.9-10-7.5d
12	5d	S0-12-5d	S0.3-12-5d	S0.6-12-5d	S0.9-12-5d
Notes: S0, S0.3, S0.6 and S0.9—0vol%, 0.3vol%, 0.6vol% and 0.9vol% of the volume of the steel fiber, respectively; 8, 10 and 12—BFRP rib diameters of 8 mm, 10 mm and 12 mm, respectively; 2.5d, 5d and 7.5d—2.5 times, 5 times and 7.5 times the diameter d of the BFRP rib anchorage length, respectively.

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表 5 BFRP筋增强钢-PVA混杂ECC粘结-滑移曲线拟合参数

Table 5. Bonding-slip curves fitting parameters of BFRP reinforced steel-PVA hybrid ECC

Specimen number	CMR model			BSP model	GFRP model		BSP model	BSP model full curve
Specimen number	α	β	R²	R²	α	R²	R²	α	β	R²
S0-10-2.5d	1.686	2.080	0.963	0.973	0.346	0.943	0.989	0.760	1.372	0.976
S0-10-5d	2.388	1.364	0.971	0.968	0.614	0.928	0.973	0.721	1.319	0.972
S0-10-7.5d	2.730	1.212	0.975	0.977	0.924	0.950	0.962	0.692	1.146	0.975
S0-12-5d	2.651	1.041	0.943	0.981	0.658	0.941	0.939	0.873	1.111	0.966
S0-8-5d	1.827	0.846	0.973	0.985	0.352	0.990	0.988	0.697	1.002	0.983
S0.3-10-2.5d	1.921	1.559	0.961	0.979	0.719	0.961	0.953	0.792	1.082	0.975
S0.3-10-5d	1.806	0.855	0.972	0.984	0.360	0.994	0.982	0.600	0.874	0.982
S0.3-10-7.5d	5.054	1.362	0.975	0.982	1.210	0.934	0.938	0.804	1.042	0.962
S0.3-12-5d	2.146	1.355	0.974	0.954	0.677	0.981	0.959	0.683	0.896	0.960
S0.3-8-5d	1.816	1.230	0.970	0.982	0.617	0.993	0.979	0.684	0.897	0.968
S0.6-10-2.5d	1.132	1.080	0.983	0.979	0.622	0.954	0.943	0.577	1.062	0.954
S0.6-10-5d	1.995	1.516	0.953	0.959	0.389	0.946	0.986	0.753	0.726	0.955
S0.6-10-7.5d	1.926	1.691	0.957	0.962	0.516	0.947	0.943	0.750	0.967	0.960
S0.6-12-5d	2.527	2.351	0.972	0.972	1.247	0.937	0.935	0.810	0.950	0.966
S0.6-8-5d	2.370	1.343	0.981	0.986	0.836	0.957	0.951	0.679	0.956	0.973
S0.9-10-2.5d	1.693	1.391	0.961	0.974	0.511	0.973	0.966	0.639	1.037	0.973
S0.9-10-5d	1.812	1.174	0.974	0.963	0.405	0.929	0.957	0.605	1.264	0.964
S0.9-10-7.5d	2.933	1.302	0.984	0.974	0.596	0.958	0.973	0.604	1.075	0.963
S0.9-12-5d	1.863	1.128	0.963	0.979	0.440	0.940	0.975	0.764	1.274	0.976
S0.9-8-5d	1.765	2.118	0.968	0.969	0.700	0.944	0.970	0.769	1.187	0.969
Notes: α and β—Coefficients to be determined; R²—Correlation coefficient obtained by fitting the bond-slip model; CMR—Cosenza-Manfredi-Realfonzo; BSP—BFRP bars and steel-PVA hybrid ECC; GFRP—GFRP/steel strand fiber composite bars.

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表 6 BFRP筋基本锚固长度粘结系数K

Table 6. Bonding coefficients K for the basic anchor length of BFRP ribs

Steel fiber doping/vol%	Compressive strength/MPa	K					Average value
Steel fiber doping/vol%	Compressive strength/MPa	10-2.5d	8-5d	10-5d	12-5d	10-7.5d	Average value
0	29.50	0.00268	0.00385	0.00265	0.00210	0.00264	0.00278
0.3	30.22	0.00307	0.00427	0.00300	0.00210	0.00295	0.00308
0.6	31.90	0.00292	0.00470	0.00291	0.00232	0.00252	0.00307
0.9	32.48	0.00335	0.00503	0.00323	0.00233	0.00291	0.00337
Average value	—	0.00300	0.00446	0.00295	0.00221	0.00275	—

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