BFRP筋与低碱度硫铝酸盐水泥混凝土粘结性能试验

赵军; 潘昊瑾; 王自柯; 宋起行

doi:10.13801/j.cnki.fhclxb.20220906.001

BFRP筋与低碱度硫铝酸盐水泥混凝土粘结性能试验

doi: 10.13801/j.cnki.fhclxb.20220906.001

郑州大学　力学与安全工程学院，郑州 450001

基金项目: 国家自然科学基金青年科学基金(51908512)；教育部创新团队发展计划(IRT_16R67)；河南省高等学校重点科研项目计划(21A560012)；河南省重点研发与推广专项(科技攻关)项目(222102320081)

详细信息

通讯作者:
王自柯，博士，副教授，硕士生导师，研究方向为纤维增强复合材料(FRP)结构　E-mail: zkwang@zzu.edu.cn

中图分类号: TU528
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出版历程
- 收稿日期: 2022-07-06
- 修回日期: 2022-08-13
- 录用日期: 2022-08-25
- 网络出版日期: 2022-09-07
- 刊出日期: 2023-06-15

Experimental investigations on bonding performance between BFRP bars and low alkalinity sulphoaluminate cement concrete

School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China

Funds: National Natural Science Foundation of China (51908512); Program for Innovative Research Team in University of Minister of Education of China (IRT_16 R67); Key Scientific Research Project of College and University in Henan Province (21 A560012); Key R & D and Promotion Special Project in Henan Province (Tackling Key Scientific and Technological Problems) (222102320081)

摘要

摘要: 为研究玄武岩纤维增强聚合物复合材料(Basalt fiber reinforced polymer，BFRP)筋与低碱度硫铝酸盐水泥混凝土的粘结性能，对共90个粘结试件进行中心拉拔试验，研究了筋材表面形貌、混凝土强度等级等因素对粘结性能的影响。试验结果表明，对筋材表面进行喷砂、缠绕纤维和螺纹处理能显著提高粘结性能，深螺纹环氧树脂BFRP筋与65 MPa低碱度硫铝酸盐水泥混凝土的粘结强度高达39.09 MPa，远大于光滑BFRP筋的13.32 MPa。强度等级对BFRP筋-低碱度硫铝酸盐水泥混凝土粘结试件的粘结强度的影响更为明显，此外BFRP筋与低碱度硫铝酸盐水泥混凝土粘结性能高于普通硅酸盐混凝土。最后，通过CMR模型和mBPE模型对BFRP筋-混凝土粘结试件的粘结滑移(τ−s)曲线进行拟合，发现CMR模型对粘结滑移曲线的上升段拟合效果较好，清晰准确地反映了其粘结-滑移本构关系，为研究BFRP筋增强硫铝酸盐水泥混凝土结构的力学性能提供了关键理论依据。
- BFRP筋 /
- 硫铝酸盐水泥混凝土 /
- 粘结强度 /
- 混凝土强度等级 /
- 筋材表面形貌 /
- 粘结滑移曲线
Abstract: In order to study the bonding performance between basalt fiber reinforced polymer (BFRP) bars and low alkalinity sulphoaluminate cement concrete, a total of 90 bonding specimens were tested by central pullout test. The effects of surface morphology of BFRP bars and concrete strength grade on the bonding performance were studied. The experimental results show that sand blasting, fiber winding and ribbed treatments on the surface of BFRP bars can significantly improve the bonding performance, the bond strength between deep ribbed epoxy resin BFRP bar and low alkalinity sulphoaluminate cement concrete with strength grade of 65 MPa is as high as 39.09 MPa, which is much higher than 13.32 MPa of smooth BFRP bar. The effect of strength grade on bond strength of BFRP bar/low alkalinity sulphoaluminate cement concrete is more obvious. In addition, the bonding performance between BFRP bars and low alkalinity sulphoaluminate concrete is higher than that of ordinary Portland concrete. Finally, the CMR and mBPE models were used to fit the bond-slip (τ−s) curve of BFRP bar-concrete bond specimens. It is found that the fitting result of CMR model for the ascending segment of the bond-slip curve is better, which clearly and accurately reflects the bond-slip constitutive relationship between BFRP bar and concrete, and provides a key theoretical basis for investigating performance of BFRP-reinforced sulphoaluminate cement concrete structures.
- BFRP bar /
- sulphoaluminate cement concrete /
- bond strength /
- concrete strength grade /
- surface morphology of bars /
- bond-slip curve

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图 1 BFRP筋表面形貌

Figure 1. Surface morphologies of BFRP bars

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图 2 BFRP筋/混凝土拉拔试件制作及尺寸

Figure 2. Fabrication and size of BFRP bar/concrete pullout specimen

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图 3 加载装置示意图

Figure 3. Schematic diagram of setup

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图 4 混凝土强度变化

Figure 4. Change of concrete strength

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图 5 BFRP筋破坏模式(P-1—拔出和表面刮擦；P-2—拔出和层间剪切；R-3—筋材拉断)

Figure 5. Failure mode of BFRP bars (P-1—Pullout and surface scraping of BFRP bar; P-2—Pullout and interlaminar shear of BFRP bar; R-3—Rebar fracture)

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图 6 不同分组BFRP筋/混凝土拉拔试件的粘结-滑移(τ-s)曲线

Figure 6. Bond-slip (τ-s) curves of different groups of BFRP bar/concrete pullout specimens

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图 7 BFRP筋/混凝土拉拔试件滑移值对比

Figure 7. Comparison of slip values of BFRP bar/concrete pullout specimens

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图 8 不同表面形貌BFRP筋/混凝土拉拔试件的τ-s曲线

Figure 8. τ-s curves of pullout specimens of BFRP bar/concrete with different surface morphologies

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图 9 不同表面形貌BFRP筋/混凝土拉拔试件的粘结强度

Figure 9. Bond strength of pullout specimens of BFRP bar with different surface morphologies/concrete

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图 10 混凝土种类对BFRP筋/混凝土拉拔试件粘结强度的影响

Figure 10. Effect of concrete types on bond strength of BFRP bar/concrete pullout specimens

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图 11 混凝土强度与BFRP筋/低碱度硫铝酸盐水泥混凝土拉拔试件粘结强度的关系

Figure 11. Relationship between concrete strength and bond strength of BFRP bar/low alkalinity sulphoaluminate cement concrete pullout specimens

τ_m—Interfacial bond strength of BFRP bars and concrete; f_cu—Cube compressive strength corresponding to the bond specimen; R²—Coefficient of determination

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图 12 BFRP筋/混凝土拉拔试件的τ-s试验与拟合曲线结果对比

Figure 12. Comparison of τ-s test and fitting curve results of BFRP bar/concrete pull-out specimens

CMR— Clustered multi-resolution; mBPE— byte pair encoding

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表 1 XRF测得的普通硅酸盐水泥和硫铝酸盐水泥化学成分及烧失量

Table 1. Chemical composition of ordinary Portland cement and sulphoaluminate cement by XRF and loss on ignition

Type	Chemical composition												LOI
Type	SiO₂	Al₂O₃	Fe₂O₃	CaO	K₂O	SO₃	TiO₂	MgO	Na₂O	P₂O₅	BaO	MnO	LOI
LSAC 42.5	7.84	17.80	2.22	50.87	0.87	16.23	0.91	2.13	0.28	0.06	−	0.06	3.22
PO 42.5	17.29	4.82	3.91	65.34	1.16	3.19	0.35	3.26	0.17	0.05	0.04	0.08	3.41
Notes: LSAC—Low alkalinity sulphoaluminate cement; PO—Portland cement.Ordinary; 42.5—Cement quantity class; LOI—Loss on ignition.

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表 2 混凝土配合比

Table 2. Mix proportion of concrete

Concrete type	Cement	River sand	Gravel (10-20 mm)	Gravel (5-10 mm)	Water	Superplasticizer
SAC(C30)	386	617	810	347	239	−
SAC(C50)	397	635	833	357	179	−
SAC(C65)	404	647	849	364	129	8.1
OPC(C30)	386	617	810	347	239	−
OPC(C65)	404	647	849	364	129	8.1
Notes: SAC—Low alkalinity sulphoaluminate cement concrete; OPC—Ordinary Portland cement concrete; C30—Compressive strength of concrete is 30 MPa.

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表 3 混凝土抗压强度及劈裂抗拉强度

Table 3. Compressive strength and splitting tensile strength of concrete

Concrete type	Compressive strength with curing time/MPa				Mechanical properties on the day of pullout test (Curing for 34 days)
Concrete type	3 days	7 days	28 days	56 days	Compressive strength/MPa	Splitting tensile strength/MPa
SAC(C30)	24.2	27.7	32.2	34.1	33.7	2.42
SAC(C50)	37.4	45.2	51.3	51.7	53.3	3.71
SAC(C65)	54.8	57.1	65.0	65.4	66.5	4.00
OPC(C30)	21.1	27.5	35.3	40.7	37.0	2.61
OPC(C65)	54.7	57.2	69.3	72.1	71.2	4.25

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表 4 玄武岩纤维增强聚合物复合材料(BFRP)筋几何特性

Table 4. Geometric properties of basalt fiber reinforced polymer (BFRP) bars

BFRP bar type	Outside diameter d_o/mm	Mean diameter d_b/mm	Density/ (g·mm⁻³)	Fiber mass fraction/wt%	Fiber volume fraction/vol%	Rib height r_h/mm	Rib width r_r/mm	Rib spacing r_s/mm	Rib angle α/(°)
SR/E	6.20	6.08	2.22	87.69	70.23	0.14	3.29	7.17	23
SC/E	7.25	6.61	2.21	82.23	70.00	−	−	−	−
DR/E	6.52	6.21	2.07	85.21	60.33	0.31	4.37	8.03	25
HW/E	7.60	6.51	2.13	80.39	64.46	0.71	2.78	7.04	27
SS/E	5.86	5.83	2.30	87.60	76.20	−	−	−	−
DR/V	6.85	6.55	2.10	87.92	65.75	0.29	4.21	6.87	20
Notes: SR/E—Shallow ribbed/epoxy resin; SC/E—Sand coated/epoxy resin; DR/E—Deep ribbed/epoxy resin; HW/E—Helical wrapping with fiber/epoxy resin; SS/E—Smooth surface/epoxy resin; DR/V—Deep ribbed/vinyl ester resin.

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表 5 BFRP筋拉伸性能测试结果

Table 5. Tensile properties results of BFRP bars

BFRP bar type	Mean diameter /mm	Ultimate tensile strength/MPa	Elastic modulus/GPa	Elongation at break/%
SR/E	6.08	1475.0±53.6	63.9±3.7	2.17±0.15
SC/E	6.60	1173.3±59.0	46.5±1.1	2.13±0.17
DR/E	6.21	1526.6±60.2	59.3±1.2	2.57±0.08
HW/E	6.51	1193.3±51.1	50.9±2.9	2.29±0.18
SS/E	5.83	1574.0±131.7	63.9±1.9	2.10±0.10
DR/V	6.55	1270.7±39.1	49.7±2.0	2.38±0.08

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表 6 所有BFRP筋/混凝土中心拉拔试件具体设计参数汇总

Table 6. Summary of design parameters of all BFRP bar/concrete pullout specimens

Specimen code	Concrete type	Strength grade of concrete	Mean diameter d_b/mm	Bond length l_b/mm	Number of test specimen
SR/E/SAC(C30)	SAC	C30	6.08	30	3
SC/E/SAC(C30)			6.60	30	3
DR/E/SAC(C30)			6.21	30	3
HW/E/SAC(C30)			6.51	30	3
SS/E/SAC(C30)			5.83	30	3
DR/V/SAC(C30)			6.55	30	3
SR/E/SAC(C50)	SAC	C50	6.08	30	3
SC/E/SAC(C50)			6.60	30	3
DR/E/SAC(C50)			6.21	30	3
HW/E/SAC(C50)			6.51	30	3
SS/E/SAC(C50)			5.83	30	3
DR/V/SAC(C50)			6.55	30	3
SR/E/SAC(C65)	SAC	C65	6.08	30	3
SC/E/SAC(C65)			6.60	30	3
DR/E/SAC(C65)			6.21	30	3
HW/E/SAC(C65)			6.51	30	3
SS/E/SAC(C65)			5.83	30	3
DR/V/SAC(C65)			6.55	30	3
SR/E/OPC(C30)	OPC	C30	6.08	30	3
SC/E/OPC(C30)			6.60	30	3
DR/E/OPC(C30)			6.21	30	3
HW/E/OPC(C30)			6.51	30	3
SS/E/OPC(C30)			5.83	30	3
DR/V/OPC(C30)			6.55	30	3
SR/E/OPC(C65)	OPC	C65	6.08	30	3
SC/E/OPC(C65)			6.60	30	3
DR/E/OPC(C65)			6.21	30	3
HW/E/OPC(C65)			6.51	30	3
SS/E/OPC(C65)			5.83	30	3
DR/V/OPC(C65)			6.55	30	3

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表 7 BFRP筋/混凝土拉拔试件试验结果汇总

Table 7. Test results of BFRP bar/concrete pullout specimens

Specimen code	Compressive strength of concrete/MPa	Splitting tensile strength of concrete/MPa	Mean bonding strength/MPa	Standard deviation/MPa	Free end slip/mm	Standard deviation/mm	Loaded end slip /mm	Standard deviation/mm	Failure mode
SR/E/SAC(C30)	33.7±0.55	2.42±0.23	16.09	1.23	1.40	0.45	1.78	0.76	P-1
SC/E/SAC(C30)			12.61	0.42	3.12	0.14	4.10	0.63	P-2
DR/E/SAC(C30)			26.38	1.30	2.20	0.56	2.90	0.39	P-1
HW/E/SAC(C30)			17.15	1.26	0.10	0.02	0.51	0.07	P-2
SS/E/SAC(C30)			6.24	0.21	0.77	0.11	0.99	0.09	P-1
DR/V/SAC(C30)			18.77	0.49	1.48	0.20	1.85	0.15	P-2
SR/E/SAC(C50)	53.3±0.92	3.71±0.35	19.80	0.76	2.01	0.67	2.50	0.75	P-1
SC/E/SAC(C50)			16.92	0.30	2.69	0.16	3.31	0.15	P-2
DR/E/SAC(C50)			34.58	1.46	2.16	0.63	3.55	1.17	P-1
HW/E/SAC(C50)			18.47	0.37	0.21	0.20	0.70	0.22	P-2
SS/E/SAC(C50)			7.71	0.69	0.88	0.02	1.14	0.13	P-1
DR/V/SAC(C50)			25.39	0.50	1.85	0.15	2.59	0.56	P-2
SR/E/SAC(C65)	66.5±1.92	3.99±0.26	25.58	0.52	1.49	0.47	1.88	0.70	P-1
SC/E/SAC(C65)			17.58	0.91	2.67	0.09	3.30	0.25	P-2
DR/E/SAC(C65)			39.09	1.04	1.88	0.70	2.53	0.81	P-1
HW/E/SAC(C65)			19.22	0.15	0.31	0.29	0.74	0.20	P-2
SS/E/SAC(C65)			13.32	0.27	0.63	0.18	0.88	0.15	P-1
DR/V/SAC(C65)			25.70	1.61	1.70	0.71	2.42	0.94	P-2
SR/E/OPC(C30)	37.0±1.25	2.61±0.26	14.87	1.15	1.02	0.62	1.47	0.75	P-1
SC/E/OPC(C30)			14.30	0.76	2.82	0.01	3.39	0.16	P-2
DR/E/OPC(C30)			27.08	0.61	2.28	0.25	2.86	0.34	P-1
HW/E/OPC(C30)			16.17	0.41	1.14	0.25	1.48	0.18	P-2
SS/E/OPC(C30)			4.60	0.25	0.69	0.12	0.93	0.15	P-1
DR/V/OPC(C30)			17.74	1.50	1.68	0.28	2.31	0.27	P-2
SR/E/OPC(C65)	71.2±0.56	4.25±0.49	16.95	2.01	1.60	0.07	1.72	0.07	P-1
SC/E/OPC(C65)			16.19	0.37	2.85	0.27	3.31	0.58	P-2
DR/E/OPC(C65)			37.42	1.50	2.04	0.36	3.17	0.74	R-3
HW/E/OPC(C65)			17.53	1.84	0.67	1.16	1.22	1.24	P-2
SS/E/OPC(C65)			7.96	1.15	0.80	0.18	1.31	0.61	P-1
DR/V/OPC(C65)			19.83	1.21	0.97	0.16	1.52	0.06	P-2
Notes: P-1—Pullout and surface scraping of BFRP bar; P-2—Pullout and interlaminar shear of BFRP bar; R-3—Rebar fracture.

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表 8 混凝土强度对不同形貌BFRP筋/低碱度硫铝酸盐水泥混凝土拉拔试件的粘结强度影响的拟合结果

Table 8. Fitting results of influence of concrete strength on bond strength of BFRP bars with different morphologies/low alkalinity sulphoaluminate cement concrete pull-out specimens

Fitting parameter	SR/E	SC/E	DR/E	HW/E	SS/E	DR/V
α₀	1.343	2.298	3.456	9.506	0.060	3.745
β₀	0.694	0.491	0.578	0.167	1.271	0.467
R²	0.93170	0.94127	0.99972	0.99930	0.83587	0.89781

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表 9 BFRP筋/混凝土拉拔试件的τ-s曲线拟合结果

Table 9. τ-s curve fitting results of BFRP bar/concrete pull-out specimens

Specimen code	CMR model					mBPE model
Specimen code	τ_m/MPa	s_m/mm	s_r	β	R²	τ_m /MPa	s_m/mm	α	p	R²
SR/E/SAC(C30)	15.71	1.182	0.489	0.175	0.780	15.71	1.182	0.135	0.155	0.853
SC/E/SAC(C30)	12.45	3.270	4.079	0.199	0.897	12.45	3.270	0.234	0.571	0.913
DR/E/SAC(C30)	27.25	2.808	0.938	0.433	0.993	27.25	2.808	0.271	0.380	0.959
HW/E/SAC(C30)	18.04	0.078	0.033	0.408	0.964	18.04	0.078	0.292	0.005	0.947
SS/E/SAC(C30)	6.19	0.823	0.006	0.530	0.827	6.19	0.823	0.103	0.164	0.753
DR/V/SAC(C30)	18.87	1.562	0.517	0.500	0.998	18.87	1.562	0.310	0.274	0.973
SR/E/SAC(C50)	19.63	1.989	0.397	0.333	0.991	19.63	1.989	0.199	0.109	0.941
SC/E/SAC(C50)	16.95	2.845	2.918	0.230	0.787	16.95	2.845	0.269	0.377	0.830
DR/E/SAC(C50)	34.12	1.517	0.562	0.401	0.992	34.12	1.517	0.269	0.117	0.976
HW/E/SAC(C50)	17.97	0.432	0.034	0.569	0.979	17.97	0.432	0.198	0.021	0.890
SS/E/SAC(C50)	7.94	0.904	1.174	0.073	0.609	7.94	0.904	0.078	0.039	0.525
DR/V/SAC(C50)	25.02	1.871	0.738	0.498	0.992	25.02	1.871	0.330	0.188	0.810
SR/E/SAC(C65)	25.70	2.016	0.658	0.262	0.960	25.70	2.016	0.179	0.137	0.955
SC/E/SAC(C65)	18.50	2.577	3.344	0.181	0.919	18.50	2.577	0.211	0.234	0.932
DR/E/SAC(C65)	39.60	1.071	0.347	0.463	0.996	39.60	1.071	0.296	0.067	0.965
HW/E/SAC(C65)	19.21	0.213	0.012	0.745	0.991	19.21	0.213	0.216	0.011	0.654
SS/E/SAC(C65)	13.22	0.622	0.060	0.278	0.862	13.22	0.622	0.152	0.044	0.720
DR/V/SAC(C65)	27.71	2.342	1.031	0.372	0.983	27.71	2.342	0.268	0.346	0.912
SR/E/OPC(C30)	16.48	0.938	0.373	0.378	0.980	16.48	0.938	0.262	0.049	0.982
SC/E/OPC(C30)	14.48	2.812	3.603	0.182	0.944	14.48	2.812	0.205	0.284	0.945
DR/E/OPC(C30)	26.46	2.072	0.562	0.527	0.999	26.46	2.072	0.296	0.253	0.947
HW/E/OPC(C30)	15.59	1.082	0.015	3.343	0.969	15.59	1.082	0.219	0.028	0.803
SS/E/OPC(C30)	4.95	0.807	0.981	0.093	0.765	4.95	0.807	0.102	0.058	0.466
DR/V/OPC(C30)	15.72	2.003	0.488	0.535	0.999	15.72	2.003	0.284	0.286	0.947
SR/E/OPC(C65)	18.35	1.655	0.160	0.769	0.995	18.35	1.655	0.213	0.144	0.871
SC/E/OPC(C65)	16.47	2.996	3.160	0.224	0.937	16.47	2.996	0.250	0.246	0.954
DR/E/OPC(C65)	37.88	1.645	0.635	0.434	0.995	37.88	1.645	0.294	6.683	0.954
HW/E/OPC(C65)	15.00	0.373	0.022	0.651	0.958	15.00	0.373	0.201	0.017	0.848
SS/E/OPC(C65)	9.14	0.807	0.168	0.273	0.892	9.14	0.807	0.176	0.144	0.883
DR/V/OPC(C65)	19.97	1.024	0.480	0.446	0.987	19.97	1.024	0.329	0.045	0.974
Notes: s—Specimen bond slip value; s_m—Bond strength corresponding slip value; s_r, β, α, p—Unknown parameters.

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