GFRP筋与自密实混凝土黏结性能的试验研究

吴丽丽; 王慧; 杨畅涵; 王云飞; 杨璐

doi:10.13801/j.cnki.fhclxb.20210207.001

GFRP筋与自密实混凝土黏结性能的试验研究

doi: 10.13801/j.cnki.fhclxb.20210207.001

吴丽丽^1, ,,
王慧^1,,
杨畅涵^1,,
王云飞^1,,
杨璐²

1.
中国矿业大学(北京)　力学与建筑工程学院，北京 100083
2.
北京工业大学　城市与工程安全减灾教育部重点实验室，北京 100124

基金项目: 国家自然科学基金(51678564)；北京工业大学城市与工程安全减灾教育部重点实验室开放基金(2020B07)

详细信息

通讯作者:
吴丽丽，博士，教授，博士生导师，研究方向为钢-混凝土组合结构　E-mail：jennywll@163.com

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-02
- 录用日期: 2021-01-25
- 网络出版日期: 2021-02-07
- 刊出日期: 2021-10-01

Experimental study on bond properties between GFRP bars and self compacting concrete

WU Lili^{1
, ,},
WANG Hui^1
,,
YANG Changhan^1
,,
WANG Yunfei^1
,,
YANG Lu²

1.
School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
2.
The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 为了研究玻璃纤维增强树脂复合材料(GFRP)筋与自密实混凝土(SCC)的黏结性能，制作了66个GFRP/SCC试件进行中心拉拔试验，研究SCC混凝土保护层厚度、GFRP筋直径和黏结长度以及SCC中添加纤维种类等因素对两者黏结性能的影响，并对试件的破坏形式进行分析。结果表明：试件主要出现了三种破坏形式，即劈裂破坏、拔出破坏、拔出带缝破坏；通过电镜扫描发现SCC浇筑方向对GFRP筋与SCC黏结界面的结构有一定影响，GFRP筋上部界面与SCC黏结更紧密。当SCC保护层厚度由4D增大至7D时，黏结强度提高了约44.05%；当GFRP筋黏结长度由5D增大至15D时，黏结强度降低了约65.43%；当GFRP筋直径由12 mm增大至16 mm时，黏结强度降低了约22.57%；SCC中添加聚丙烯纤维、钢纤维、聚丙烯纤维+钢纤维的试件黏结强度比不添加纤维的试件黏结强度分别提高12.80%、15.16%、15.09%。可以通过适当增加SCC保护层厚度、在SCC中添加纤维等措施来提高GFRP/SCC试件的黏结强度。
- GFRP复合筋 /
- 自密实混凝土 /
- 拉拔试验 /
- 黏结强度 /
- 纤维
Abstract: In order to study the bond behavior between glass fiber reinforced polymer (GFRP) bars and self compacting concrete (SCC), pull-out tests on sixty-six GFRP/SCC specimens were deployed and carried out. The effects of SCC cover thickness, bond length and diameter of GFRP bars as well as the fiber types added to SCC on bond properties were investigated. In addition, the failure modes of specimens were analyzed. The results show that there are mainly three failure modes, namely splitting failure, pull-out failure and pull-out failure with cracks. It is found by scanning electron microscopy (SEM) that the infilling direction of SCC has a certain influence on the structure of the bar-SCC interface. The upper interface of GFRP bars is bonded more closely to SCC compared with the lower one. When the SCC cover thickness increases from 4D to 7D, the bond strength is increased by about 44.05%. When the bond length of GFRP bars increases from 5D to 15D, the bond strength decreases by about 65.43%. When the diameter of GFRP bars increases from 12 mm to 16 mm, the bond strength decreases by about 22.57%. Meanwhile, the bond strengths of the specimens mixed with polypropylene fiber, steel fiber, hybrid fiber (polypropylene fiber and steel fiber) in SCC are about 12.80%, 15.16%, 15.09% higher than that of the specimens without any fibers respectively. Hence, the bond strength of GFRP/SCC specimens can be improved by increasing the SCC cover thickness, or adding fibers to SCC etc.
- GFRP bar /
- self compacting concrete /
- pull-out test /
- bond strength /
- fiber

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图 1 拉拔GFRP筋/SCC试件

Figure 1. GFRP bars/SCC specimens

PVC—Polyvinyl chloride

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图 2 加载实物图

Figure 2. Test set-up

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图 3 GFRP筋/SCC典型的破坏形式

Figure 3. Typical failure forms of GFRP bars/SCC

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图 4 GFRP筋与SCC黏结界面微观扫描形态

Figure 4. SEM images on bond interface between GFRP bars and SCC

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图 5 不同参数下GFRP筋/SCC试件加载端的典型黏结-滑移曲线

Figure 5. Typical bond stress-slip relationship for the loaded end of GFRP bars/SCC specimens under different parameters

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图 6 GFRP筋/SCC加载端和自由端黏结-滑移曲线对比

Figure 6. Comparison of bond stress-slip relationship between loaded end and free end of GFRP bars/SCC

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图 7 SCC保护层厚度对GFRP筋与SCC黏结强度的影响

Figure 7. Influence of SCC cover thickness on ultimate bond strength between GFRP bars and SCC

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图 8 GFRP筋/SCC拉拔过程受力示意图

Figure 8. Diagram of force in pull-out process for GFRP bars/SCC

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图 9 GFRP筋黏结长度对GFRP筋与SCC黏结强度的影响

Figure 9. Influence of bond length of GFRP bars on ultimate bond strength between GFRP bars and SCC

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图 10 GFRP筋直径对GFRP筋与SCC黏结强度的影响

Figure 10. Influence of diameter of GFRP bars on ultimate bond strength between GFRP bars and SCC

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图 11 纤维种类对GFRP筋与SCC黏结强度的影响

Figure 11. Influence of fiber types on ultimate bond strength between GFRP bars and SCC

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表 1 纤维物理性能

Table 1. Physical properties of fibers

Variety	Diameter/ mm	Length/ mm	Length/ Diameter	Density/ (g·cm⁻³)	Elastic modulus/GPa	Tensile strength/MPa	Breaking elongation/%	Surface friction coefficient
SF	0.22	13	59.1	7.85	100	2800	10.1	0.35
PP	0.9	40	44.4	0.92	9.05	500	—	0.63
Notes: SF—Steel fiber; PP—Polypropylene fiber.

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表 2 C60自密实混凝土(SCC)配合比

Table 2. C60 self compacting concrete (SCC) mix proportion

Cement	Fly ash	Sand	Pebble	Water-reducer	Water	Water-binder ratio	Sand ratio/%
2.98	0.99	5.28	5.51	0.03	1	0.27	49

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表 3 玻璃纤维增强树脂复合材料(GFRP)筋物理参数

Table 3. Physical parameters of glass fiber reinforced polymer (GFRP) bars

Diameter/mm	Rib pitch d_r/mm	Rib height h_r/mm	Rib angle α/(°)	Effective diameter d_e/mm
12	12	0.72	71.3	12
14	14	0.84	71.3	14
16	16	0.96	71.3	16

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表 4 中心拉拔GFRP筋/SCC试件明细

Table 4. Schedule of central pull-out GFRP bars/SCC specimen

Serial number	Bar diameter D/mm	Bond length/mm	Cover thickness/mm	Size/mm	Number
12GFRP/SCC(4D-5D)	12	60(5D)	48(4D)	108×108×150	6
12GFRP/SCC(5D-5D)	12	60(5D)	60(5D)	132×132×150	6
12GFRP/SCC(6D-5D)	12	60(5D)	72(6D)	156×156×150	6
12GFRP/SCC(7D-5D)	12	60(5D)	84(7D)	180×180×150	6
12GFRP/SCC(6D-10D)	12	120(10D)	72(6D)	156×156×150	6
12GFRP/SCC(6D-15D)	12	180(15D)	72(6D)	156×156×200	6
14GFRP/SCC(6D-5D)	14	70(5D)	84(6D)	182×182×150	6
16GFRP/SCC(6D-5D)	16	80(5D)	96(6D)	208×208×150	6
PP-12GFRP/SCC(6D-5D)	12	60(5D)	72(6D)	156×156×150	6
SF-12GFRP/SCC(6D-5D)	12	60(5D)	72(6D)	156×156×150	6
SF-PP-12GFRP/SCC(6D-5D)	12	60(5D)	72(6D)	156×156×150	6
Notes: Serial number of bond specimens apply a-bGFRP/SCC(c-d): a—Types of fiber (i.e., PP—Polypropylene fiber; SF—Steel fiber; SF-PP—Polypropylene fiber and steel fiber); b—Diameter of GFRP bar; c—Cover thickness of SCC (D—Diameter of GFRP bar); d—Bond length.

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表 5 GFRP筋/SCC中心拉拔试验结果

Table 5. Results of central pull-out test for GFRP bars/SCC

Serial number	S₁/mm	S₂/mm	F_max/kN	τ_max/MPa	Failure mode
12GFRP/SCC(4D-5D)-1	1.70	0.43	24.58	10.87	P
12GFRP/SCC(4D-5D)-2	1.81	0.47	25.32	11.20	P
12GFRP/SCC(4D-5D)-3	1.75	0.43	25.69	11.36	P
12GFRP/SCC(4D-5D)-4	1.69	0.42	26.51	11.93	P
12GFRP/SCC(4D-5D)-5	1.73	0.42	25.52	11.29	P
12GFRP/SCC(4D-5D)-6	2.12	0.36	25.93	11.47	P
12GFRP/SCC(5D-5D)-1	2.73	0.82	32.29	14.28	P
12GFRP/SCC(5D-5D)-2	3.15	0.90	30.67	13.56	P
12GFRP/SCC(5D-5D)-3	2.93	0.72	31.34	13.86	P
12GFRP/SCC(5D-5D)-4	1.89	0.43	27.34	12.09	P
12GFRP/SCC(5D-5D)-5	3.01	1.07	32.56	14.40	P
12GFRP/SCC(5D-5D)-6	3.11	0.77	31.54	13.95	P
12GFRP/SCC(6D-5D)-1	4.51	3.01	34.97	15.47	B
12GFRP/SCC(6D-5D)-2	3.57	1.99	34.99	15.48	B
12GFRP/SCC(6D-5D)-3	2.78	1.35	32.02	14.16	BF
12GFRP/SCC(6D-5D)-4	3.20	1.37	32.83	14.52	BF
12GFRP/SCC(6D-5D)-5	3.62	1.23	32.67	14.45	P
12GFRP/SCC(6D-5D)-6	3.83	1.53	33.89	14.99	P
12GFRP/SCC(7D-5D)-1	3.89	1.92	36.68	16.22	B
12GFRP/SCC(7D-5D)-2	3.34	1.57	38.46	17.01	B
12GFRP/SCC(7D-5D)-3	2.72	0.96	34.57	15.29	B
12GFRP/SCC(7D-5D)-4	3.04	1.41	39.03	17.26	B
12GFRP/SCC(7D-5D)-5	4.15	1.87	36.37	16.09	B
12GFRP/SCC(7D-5D)-6	3.51	1.83	36.74	16.25	B
12GFRP/SCC(6D-10D)-1	3.03	0.24	41.69	9.22	P
12GFRP/SCC(6D-10D)-2	—	—	—	—	M
12GFRP/SCC(6D-10D)-3	2.87	0.56	40.37	8.93	P
12GFRP/SCC(6D-10D)-4	2.56	0.62	41.13	9.10	P
12GFRP/SCC(6D-10D)-5	2.69	0.48	42.79	9.46	P
12GFRP/SCC(6D-10D)-6	2.88	0.59	41.58	9.19	P
12GFRP/SCC(6D-15D)-1	1.61	—	40.38	5.95	P
12GFRP/SCC(6D-15D)-2	1.53	—	39.87	5.88	P
12GFRP/SCC(6D-15D)-3	1.59	—	37.49	5.53	P
12GFRP/SCC(6D-15D)-4	1.64	—	36.66	5.41	P
12GFRP/SCC(6D-15D)-5	—	—	—	—	M
12GFRP/SCC(6D-15D)-6	1.58	—	40.02	5.90	P
14GFRP/SCC(6D-5D)-1	2.63	0.92	41.53	13.49	BF
14GFRP/SCC(6D-5D)-2	2.49	0.75	39.85	12.95	BF
14GFRP/SCC(6D-5D)-3	3.97	1.16	44.35	14.41	P
14GFRP/SCC(6D-5D)-4	3.52	1.89	46.87	15.23	BF
14GFRP/SCC(6D-5D)-5	—	1.89	46.67	15.17	P
14GFRP/SCC(6D-5D)-6	2.67	0.88	43.27	14.06	M
16GFRP/SCC(6D-5D)-1	1.99	0.14	45.90	11.42	P
16GFRP/SCC(6D-5D)-2	—	—	—	—	M
16GFRP/SCC(6D-5D)-3	1.59	0.30	46.34	11.53	P
16GFRP/SCC(6D-5D)-4	1.67	0.21	49.86	12.40	P
16GFRP/SCC(6D-5D)-5	—	—	—	—	M
16GFRP/SCC(6D-5D)-6	1.95	0.21	42.68	10.62	P
PP-12GFRP/SCC(6D-5D)-1	4.60	1.89	38.42	16.99	BF
PP-12GFRP/SCC(6D-5D)-2	3.29	1.30	38.01	16.81	BF
PP-12GFRP/SCC(6D-5D)-3	3.17	1.24	38.13	16.86	BF
PP-12GFRP/SCC(6D-5D)-4	2.42	1.04	37.53	16.60	BF
PP-12GFRP/SCC(6D-5D)-5	3.55	2.25	38.61	17.08	P
PP-12GFRP/SCC(6D-5D)-6	2.48	1.16	36.46	16.13	P
SF-12GFRP/SCC(6D-5D)-1	4.07	1.80	36.33	16.07	B
SF-12GFRP/SCC(6D-5D)-2	3.81	1.78	38.65	17.10	B
SF-12GFRP/SCC(6D-5D)-3	4.09	2.17	39.07	17.28	B
SF-12GFRP/SCC(6D-5D)-4	3.57	1.85	39.85	17.63	B
SF-12GFRP/SCC(6D-5D)-5	3.68	1.75	38.67	17.10	B
SF-12GFRP/SCC(6D-5D)-6	4.15	1.97	39.26	17.36	B
SF-PP-12GFRP/SCC(6D-5D)-1	4.10	2.15	40.84	18.06	BF
SF-PP-12GFRP/SCC(6D-5D)-2	3.28	1.53	37.24	16.47	BF
SF-PP-12GFRP/SCC(6D-5D)-3	4.23	2.20	37.14	16.43	B
SF-PP-12GFRP/SCC(6D-5D)-4	4.25	1.76	39.54	17.49	B
SF-PP-12GFRP/SCC(6D-5D)-5	3.12	0.89	37.20	16.45	B
SF-PP-12GFRP/SCC(6D-5D)-6	3.94	2.06	39.79	17.59	B
Notes: S₁—Slip at the loaded end; S₂—Slip at the free end; F_max—Maximum pull-out load; τ_max—Maximum bond strength; In the failure mode, P—Splitting failure; B—Pull-out failure; BF—Pull-out failure with cracks; M—Destroy of bottom anchor of GFRP bars.

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