GFRP筋与煤矸石混凝土粘结性能试验

张霓; 邱睿; 顾雪甜; 董建强

GFRP筋与煤矸石混凝土粘结性能试验

辽宁工程技术大学　土木工程学院, 阜新 123000

基金项目: 辽宁省自然科学基金计划面上项目 (2022-MS-399)；辽宁省大学生创新创业训练计划项目(S202310147010)

详细信息

通讯作者:
张霓，博士，副教授，硕士生导师，研究方向为固体废弃物资源化利用　E-mail: zhangni@lntu.edu.cn

中图分类号: TU398
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- 被引次数: 0
出版历程
- 收稿日期: 2024-06-27
- 修回日期: 2024-08-18
- 录用日期: 2024-09-03
- 网络出版日期: 2024-09-12

Experimental study on the bonding performance between GFRP reinforcement and coal gangue concrete

School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China

Funds: Liaoning Provincial Natural Science Foundation Program (2022-MS-399); Liaoning Province College Students' Innovation and Entrepreneurship Training Program Project (S202310147010)

摘要

摘要: 为研究不同影响因素对玻璃纤维增强树脂基复合材料GFRP (Glass fiber reinforced polymer)筋和煤矸石混凝土粘结性能的影响，进行了48个GFRP筋煤矸石混凝土试件的拉拔试验，分析了煤矸石取代率、GFRP筋直径、煤矸石混凝土强度、锚固长度等影响因素对GFRP筋与煤矸石混凝土粘结性能的影响。结果表明：GFRP筋和煤矸石混凝土试件的破坏形态有拔出破坏和劈裂破坏两种。GFRP筋与煤矸石混凝土的粘结-滑移曲线大致分3个阶段：上升段、下降段和残余段。随着煤矸石取代率的升高，极限粘结强度随之降低。在煤矸石混凝土基准强度C35组，煤矸石骨料取代率由0%增加到100%，极限粘结强度由5.5%下降至25.2%，高于煤矸石混凝土基准强度C50组的4.7%~21.2%；由于剪切滞后及泊松效应的影响，粘结强度随着筋直径的增大逐渐减小，直径16 mm的极限粘结强度大致为直径10 mm的77%；当锚固长度增加到一定值时，荷载不再增加，锚固长度从30 mm (2.5 d)增加到120 mm (10 d)，极限粘结强度降低了22.89%。采用三段式粘结应力-滑移关系建立了GFRP筋煤矸石混凝土粘结滑移本构模型，为此类构件粘结锚固性能的研究奠定了理论基础。
- 煤矸石混凝土 /
- GFRP筋 /
- 拉拔试验 /
- 粘结滑移 /
- 试验研究
Abstract: To investigate the influence of different influencing factors on the bonding performance between glass fiber reinforced polymer reinforcement and coal gangue concrete, 48 GFRP reinforcement coal gangue concrete specimens were subjected to pull-out tests. The influence of factors such as coal gangue substitution rate, GFRP reinforcement diameter, coal gangue concrete strength, and anchoring length on the bonding performance between GFRP reinforcement and coal gangue concrete was analyzed. The results indicate that the failure modes of GFRP reinforcement and coal gangue concrete specimens include pull-out failure and splitting failure. The bond slip curve between GFRP reinforcement and coal gangue concrete can be roughly divided into three stages: ascent stage, descent stage, and residual stage. As the replacement rate of coal gangue increases, the ultimate bonding strength decreases. In the coal gangue concrete benchmark strengh C35 group, the replacement rate of coal gangue aggregate increases from 0% to 100%, and the ultimate bonding strength decreases from 5.5% to 25.2%, which is higher than the 4.7%-21.2% of coal gangue concrete benchmark strengh C50 group. Due to the influence of shear lag and Poisson's effect, the bond strength gradually decreases with the increase of reinforcement diameter. The ultimate bonding strength of 16 mm diameter is approximately 77% of that of 10 mm diameter. When the anchorage length increases to a certain value, the load no longer increases. The anchorage length increases from 30 mm (2.5 d) to 120 mm (10 d), and the ultimate bonding strength decreases by 22.89%. A three-stage bonding stress slip relationship was used to establish a bonding slip constitutive model for GFRP reinforced coal gangue concrete, laying a theoretical foundation for the study of bonding and anchoring performance of such components.
- coal gangue concrete /
- GFRP reinforcement /
- pullout test /
- bond slip /
- experimental research

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图 1 粗骨料

Figure 1. Coarse aggregate and natural aggregate

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图 2 煤矸石骨料与天然骨料累计筛余曲线

Figure 2. Cumulative screening curve of coal gangue aggregate

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图 3 GFRP筋几何特征

Figure 3. Geometrical features of GFRP reinforcement

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图 4 拉拔试件模具

Figure 4. Mould of pull-out specimen

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图 5 拉拔试件示意图

Figure 5. Size chart of pull-out specimen

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图 6 试件制作

Figure 6. Test specimen production

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图 7 试验加载装置

Figure 7. Loading device of test

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图 8 GFRP筋拔出破坏

Figure 8. Pull-out failure of GFRP reinforcement

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图 9 混凝土劈裂破坏

Figure 9. Splitting failure of concrete

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图 10 GFRP筋与煤矸石混凝土粘结-滑移曲线

Figure 10. Bond slip curve between GFRP reinforcement and coal gangue concrete

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图 11 GFRP筋与煤矸石混凝土粘结力示意图

Figure 11. Schematic diagram of bonding force between GFRP reinforcement and coal gangue concrete

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图 12 煤矸石取代率对GFRP筋-煤矸石混凝土极限荷载和粘结强度的影响

Figure 12. Effect of coal gangue substitution rate on ultimate load and bond strength of GFRP reinforcement-coal gangue concrete

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图 13 煤矸石骨料取代率对GFRP筋-煤矸石混凝土粘结-滑移曲线的影响

Figure 13. Effect of aggregate substitution rate of coal gangue on bond-slip curve of GFRP reinforcement-coal gangue concrete

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图 14 GFRP筋直径对GFRP筋-煤矸石混凝土极限荷载和粘结强度的影响

Figure 14. Effect of GFRP bar diameter on ultimate load and bond strength of GFRP reinforcement-coal gangue concrete

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图 15 GFRP筋纵向受力时的横截面正应力分布图

Figure 15. Normal stress distribution diagram of GFRP bar under longitudinal stress

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图 16 GFRP筋直径对GFRP筋-煤矸石混凝土粘结-滑移曲线的影响

Figure 16. Effect of GFRP bar diameter on bond-slip curve of GFRP reinforcement-coal gangue concrete

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图 17 煤矸石混凝土强度对GFRP筋-煤矸石混凝土极限荷载和粘结强度的影响

Figure 17. Effect of coal gangue concrete strength on ultimate load and bond strength of GFRP reinforcement-coal gangue concrete

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图 18 煤矸石混凝土强度对GFRP筋-煤矸石混凝土粘结-滑移曲线的影响

Figure 18. Influence of strength of coal gangue concrete on bond-slip curve of GFRP reinforcement-coal gangue concrete

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图 19 锚固长度对GFRP筋-煤矸石混凝土极限荷载和粘结强度的影响

Figure 19. Effect of anchorage length on ultimate load and bond strength of GFRP reinforcement-coal gangue concrete

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图 20 锚固长度对GFRP筋-煤矸石混凝土粘结-滑移曲线的影响

Figure 20. Influence of anchorage length on bond-slip curve of GFRP reinforcement-coal gangue concrete

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图 21 GFRP筋-煤矸石混凝土粘结应力分布

Figure 21. Bond stress distribution of GFRP reinforcement-coal gangue concrete

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图 22 GFRP筋-煤矸石混凝土试验曲线与现有模型拟合

Figure 22. Fitting experimental curves with existing models for GFRP reinforcement-coal gangue concrete

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图 23 本文建议GFRP筋-煤矸石混凝土粘结-滑移本构关系

Figure 23. Bond-slip curve of GFRP reinforcement-coal gangue concrete proposed in this paper

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图 24 特征点处试验值与计算值对比

Figure 24. Comparison of test and calculated values at characteristic points

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表 1 材料基本物理性能指标

Table 1. Basic physical propertier of materials

Type of coarse aggregate	Apparent density/(kg·m⁻³)	Bulk density/(kg·m⁻³)	Water absorption rate/%	Crushing value/%
Coal gangue	2490	1254	9.6	18.9
Natural aggregate	2789	1470	1.3	7.4

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表 2 煤矸石混凝土与普通混凝土配合比

Table 2. Mix proportion of defferent gangue substitution ratio

Concrete strength at 100% rate of coal gangue aggregate	Coal gangue replacement rate/%	Gangue/ (kg·m⁻³)	Stone/ (kg·m⁻³)	Sand/ (kg·m⁻³)	Cement/ (kg·m⁻³)	Water/ (kg·m⁻³)	Fly ash/ (kg·m⁻³)	Water reducing agent/ (kg·m⁻³)	Additional water/ (kg·m⁻³)	Cubic compressive strength/ MPa
C35	0	—	769	769	376	171	94	3.8	0	44.38
	25	192.3	603.7	769	376	171	94	3.8	13.8	42.34
	50	384.5	384.5	769	376	171	94	3.8	27.5	40.71
	75	603.7	192.3	769	376	171	94	3.8	41.3	39.95
	100	769	—	769	376	171	94	3.8	55	38.27
C50	0	—	769	660	540	160	40	6.4	0	62.85
	25	192.3	603.7	660	540	160	40	6.4	13.8	60.27
	50	384.5	384.5	660	540	160	40	6.4	27.5	59.01
	75	603.7	192.3	660	540	160	40	6.4	41.3	58.16
	100	769	—	660	540	160	40	6.4	55	55.34

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表 3 GFRP筋的力学性能及肋参数

Table 3. Mechanical properties and rib parameters of GFRP reinforcement

Reinforcement material	Diameter/ mm	Elastic modulus/ GPa	Tensile strength/ MPa	GFRP rib width/ mm	Concrete rib width/mm	Rib height/ mm
GFRP	10	45.7	1032.7	8.01	2.19	0.29
	12	45.0	951.3	8.11	2.23	0.33
	14	44.6	807.0	8.15	2.13	0.34
	16	43.2	729.2	8.83	2.14	0.36

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表 4 试件设计参数

Table 4. Design parameters of test pieces

Number	Specimen number	Coal gangue replacement rate/%	GFRP reinforcement diameter/mm	Anchor length/mm
1	GC0-G-12-60	0	12	60
2	GC25-G-12-60	25	12	60
3	GC50-G-12-60	50	12	60
4	GC75-G-12-60	75	12	60
5	GC100-G-12-60	100	12	60
6	GC100-G-12-30	100	12	30
7	GC100-G-12-90	100	12	90
8	GC100-G-12-120	100	12	120
9	GC100-G-10-60	100	10	60
10	GC100-G-14-60	100	14	60
11	GC100-G-16-60	100	16	60
12	GC0-P-12-60	0	12	60
13	GC25-P-12-60	25	12	60
14	GC50-P-12-60	50	12	60
15	GC75-P-12-60	75	12	60
16	GC100-P-12-60	100	12	60
Notes: The naming convention for specimens is as follows: coal gangue replacement rate+concrete benchmark strength at 100% coal gangue aggregate substitution rate+GFRP reinforcement diameter+anchorage length. G represents the benchmark strength C50 of coal gangue concrete. P represents the benchmark strength C35 of coal gangue concrete. For example, specimen GC0-G-12-60 represents the coal gangue substitution rate of 0%, the coal gangue concrete benchmark strength of C50, the GFRP reinforcement diameter of 12 mm, and the anchorage length of 60 mm.

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表 5 GFRP筋-煤矸石混凝土试件试验结果

Table 5. Test results of GFRP reinforcement-coal gangue concrete pieces

Number	Specimen number	Ultimate load/kN	Bond strength/MPa	Average bond strength/MPa	Peak slip amount/mm	Residual strength/MPa	Residual slip amount/mm	Failure mode
1	GC0-G-12-60-1	34.56	15.28	15.14	4.69	5.33	12.15	P
	GC0-G-12-60-2	34.00	15.03					P
	GC0-G-12-60-3	34.20	15.12					P
2	GC25-G-12-60-1	33.43	14.78	14.42	4.54	3.90	11.72	P
	GC25-G-12-60-2	31.44	13.90					P
	GC25-G-12-60-3	33.00	14.59					P
3	GC50-G-12-60-1	31.19	13.79	13.10	4.21	3.48	10.97	P
	GC50-G-12-60-2	28.98	12.81					P
	GC50-G-12-60-3	28.73	12.70					P
4	GC75-G-12-60-1	27.17	12.01	12.74	4.05	3.47	12.12	P
	GC75-G-12-60-2	28.98	12.81					S
	GC75-G-12-60-3	30.29	13.39					P
5	GC100-G-12-60-1	26.17	11.57	11.93	4.15	3.95	11.96	P
	GC100-G-12-60-2	27.87	12.32					P
	GC100-G-12-60-3	26.89	11.89					P
6	GC100-G-12-30-1	15.09	13.34	13.02	3.90	4.14	10.78	P
	GC100-G-12-30-2	14.21	12.56					P
	GC100-G-12-30-3	14.87	13.15					P
7	GC100-G-12-90-1	37.02	10.91	10.92	4.4	3.79	9.73	P
	GC100-G-12-90-2	36.98	10.90					S
	GC100-G-12-90-3	37.19	10.96					P
8	GC100-G-12-120-1	46.73	10.33	10.04	4.61	3.32	11.21	S
	GC100-G-12-120-2	43.79	9.68					P
	GC100-G-12-120-3	45.78	10.12					S
9	GC100-G-10-60-1	24.73	13.12	13.17	4.06	3.88	11.23	P
	GC100-G-10-60-2	23.66	12.55					P
	GC100-G-10-60-3	26.11	13.85					P
10	GC100-G-14-60-1	30.16	11.43	11.10	3.90	3.90	11.85	P
	GC100-G-14-60-2	27.10	10.27					P
	GC100-G-14-60-3	30.64	11.61					S
11	GC100-G-16-60-1	29.38	9.74	10.16	4.07	4.14	11.45	P
	GC100-G-16-60-2	32.40	10.74					S
	GC100-G-16-60-3	30.19	10.01					P
12	GC0-P-12-60-1	32.05	14.17	14.63	4.42	4.22	10.92	S
	GC0-P-12-60-2	34.81	15.39					P
	GC0-P-12-60-3	32.39	14.32					P
13	GC25-P-12-60-1	28.46	12.58	13.82	4.36	4.42	10.06	P
	GC25-P-12-60-2	31.69	14.01					S
	GC25-P-12-60-3	33.59	14.85					P
14	GC50-P-12-60-1	26.85	11.87	12.84	4.14	3.68	9.87	P
	GC50-P-12-60-2	32.10	14.19					P
	GC50-P-12-60-3	28.16	12.45					S
15	GC75-P-12-60-1	25.72	11.37	11.09	3.97	3.97	10.42	P
	GC75-P-12-60-2	24.13	10.67					P
	GC75-P-12-60-3	25.40	11.23					S
16	GC100-P-12-60-1	22.78	10.07	9.95	3.67	3.31	11.00	S
	GC100-P-12-60-2	22.10	9.76					P
	GC100-P-12-60-3	22.62	10.00					P
Notes: P represents pull-out failure; S represents splitting failure.

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表 6 文献${\tau _{\text{u}}}$试验值与计算值对比

Table 6. Comparison of experimental and calculated ${\tau _{\text{u}}}$values in literature

Reference	$ {f_{\text{c}}}^\prime $	$ c/{d_{\text{f}}} $	$ {d_{\text{f}}}/l $	Experimental value/MPa	Calculated value/MPa	Relative error/%
Won^[21]	73.68	5.27	0.25	18.91	17.12	6.10
Won^[21]	93.83	5.27	0.25	21.48	20.04	6.71
Basaran^[22]	29.14	4.50	0.10	10.74	9.46	11.89
Hu Chengchao^[23]	28.20	4.19	0.20	10.44	9.64	7.67
Solyom^[24]	66.10	5.75	0.20	18.09	17.04	5.80
Wang Yan^[25]	40.60	1.60	0.20	9.27	8.60	7.28
Xue Weichen^[26]	30.02	4.50	0.10	8.53	9.60	12.60
Dai Qianqian^[27]	30.00	4.93	0.20	10.96	10.67	2.63
Notes: $ {f_{\text{c}}}^\prime $—Concrete compressive strength; $ c $—Thickness of concrete protective layer; $ {d_{\text{f}}} $—FRP reinforcement diameter; $ l $—Anchor length.

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