FRP筋在不同腐蚀环境下的层间剪切性能劣化试验

王自柯; 段建新; 赵军; 杨永明

doi:10.13801/j.cnki.fhclxb.20230822.001

FRP筋在不同腐蚀环境下的层间剪切性能劣化试验

doi: 10.13801/j.cnki.fhclxb.20230822.001

1.
郑州大学　力学与安全工程学院，郑州 450001
2.
郑州大学　土木工程学院，郑州 450001

基金项目: 国家自然科学基金(52278282)；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:
赵军，博士，教授，博士生导师，研究方向为纤维聚合物(FRP)筋混凝土结构　E-mail: zhaoj@zzu.edu.cn

中图分类号: TU528；TB332
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出版历程
- 收稿日期: 2023-06-21
- 修回日期: 2023-08-01
- 录用日期: 2023-08-12
- 网络出版日期: 2023-08-22
- 刊出日期: 2024-04-01

Experimental study on the degradation of interlaminar shear performance of FRP bars in different corrosive environments

1.
School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
2.
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Funds: National Natural Science Foundation of China (52278282); Program for Innovative Research Team in University of Minister of Education of China (IRT_16R67); Key Scientific Research Project of College and University in Henan Province (21A560012); Key R&D and Promotion Special Project in Henan Province (Tackling Key Scientific and Technological Problems) (222102320081)

摘要

摘要: 本文研究了玄武岩纤维、玻璃纤维及碳纤维增强聚合物(BFRP、GFRP和CFRP)筋在水、强碱溶液(pH=12.8)、弱碱溶液(pH=11)、模拟海水及酸溶液(pH=1.5)这5种腐蚀溶液环境下的性能劣化情况。通过层间剪切强度测试、水吸收试验、DMA、FTIR和SEM探究了不同老化温度(20、40和55℃)与腐蚀时间(1、2、3、6和9月)下FRP筋的纤维-树脂界面粘结性能、微观结构及化学成分等的劣化规律。试验结果表明：FRP筋的层间剪切强度受腐蚀环境的影响显著，在强碱溶液中的劣化速率远高于其他溶液，其原因是高浓度的OH⁻离子加速了FRP筋的水解和刻蚀反应，导致大量纤维与树脂发生脱粘，最终导致层间剪切强度降低；与BFRP筋和GFRP筋相比，CFRP筋的耐久性相对优异，在相同老化条件下具有更高的层间剪切强度保留率。
- FRP筋 /
- 腐蚀环境 /
- 层间剪切强度 /
- 水吸收 /
- 红外光谱分析 /
- 热机械分析
Abstract: In this paper, the performance deterioration of basalt-, glass- and carbon-fiber reinforced polymer (BFRP, GFRP and CFRP) bars in five kinds of corrosive solution environments, i.e., water, strong alkali solution (pH=12.8), weak alkali solution (pH=11), simulated seawater and acid solution (pH=1.5), was investigated. The deterioration patterns of fiber-resin interfacial bonding properties, microstructure and chemical composition of FRP bars at different aging temperatures (20, 40 and 55℃) and corrosion periods (1, 2, 3, 6 and 9 months) were investigated by interlaminar shear strength, water absorption, DMA, FTIR and SEM tests. The test results show that the interlaminar shear strength of FRP bars is significantly affected by the corrosive environment, and the deterioration rate of FRP specimen in the strong alkali solution is much higher than the other four solutions. The reason is that the high concentration of OH⁻ ions accelerates the hydrolysis and etching reaction of FRP bars, causing a large number of fibers and resin debonding, which eventually leads to the reduction of interlaminar shear strength. Compared with BFRP bars and GFRP bars, CFRP bars have relatively excellent durability and higher interlaminar shear strength retention ratio under the same aging conditions.
- FRP bar /
- corrosion environment /
- interlaminar shear strength /
- moisture uptake /
- FTIR /
- DMA

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图 1 短梁剪切试验装置与剪切破坏试样

Figure 1. Interlaminar shear test set-up and specimens after interlaminar shear failure

BFRP, GFRP, CFRP—Basalt-, glass- and carbon-fiber reinforced polymer

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图 2 纤维增强聚合物(FRP)筋老化9个月后的表面形貌

Figure 2. Surface morphologies of fiber reinforced polymer (FRP) bars aged for 9 months

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图 3 老化后FRP筋的层间剪切强度保留率

Figure 3. Interlaminar shear strength retention of FRP bars after aging

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图 4 FRP筋在不同温度的溶液环境下的吸水率

Figure 4. Water absorption results of FRP bars in different kinds of corrosion solution environments at different temperatures

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图 5 FRP筋在55℃老化9个月后的储能模量曲线

Figure 5. Storage modulus curves of FRP bars after aged at 55℃ for 9 months

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图 6 FRP筋在55℃下老化9个月后的损耗因子tanδ曲线

Figure 6. Loss factor tanδ curves of FRP bars aged at 55℃ for 9 months

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图 7 FRP筋在55℃不同溶液中tanδ峰值随老化时间的变化曲线

Figure 7. Variation curves of peak value of tanδ of FRP bars in different solutions at 55℃ with aging time

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图 8 FRP筋在55℃不同溶液中玻璃化转变温度T_g随老化时间的变化曲线

Figure 8. Variation curves of glass transition temperature T_g of FRP bars in different solutions at 55℃ with aging time

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图 9 FRP筋在55℃不同溶液中老化9个月的FTIR图谱

Figure 9. FTIR spectra of FRP bars aged for 9 months in different solutions at 55℃

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图 10 短梁剪切试验后BFRP筋试样的SEM图像

Figure 10. SEM images of BFRP bars specimens after short beam shear test

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图 12 短梁剪切试验后CFRP筋试样的SEM图像

Figure 12. SEM images of CFRP bars specimens after short beam shear test

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图 11 短梁剪切试验后GFRP筋试样的SEM图像

Figure 11. SEM images of GFRP bars specimens after short beam shear test

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表 1 4种溶液的化学成分组成

Table 1. Chemical composition of four kinds of solutions

Composition	Solution 2 concentration/(g·L⁻¹)	Solution 3 concentration/(g·L⁻¹)	Solution 4 concentration/(g·L⁻¹)	Solution 5 concentration/(g·L⁻¹)
NaOH	0.9	0.012	—	—
KOH	4.2	0.028	—	—
Ca(OH)₂	118.5	0.00074	—	—
H₂SO₄	—	—	—	1.58
NaCl	—	—	24.53	—
MgCl₂	—	—	5.20	—
Na₂SO₄	—	—	4.09	—
CaCl₂	—	—	1.16	—
KCl	—	—	0.695	—
NaHCO₃	—	—	0.201	—
KBr	—	—	0.101	—
H₃BO₃	—	—	0.027	—
SrCl₂	—	—	0.025	—
NaF	—	—	0.003	—
Note: "—" represents "not available".

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表 2 老化后BFRP筋的层间剪切强度

Table 2. Interlaminar shear strength of BFRP bars after aging

Temperature/℃	Time/ month	Solution 1		Solution 2		Solution 3		Solution 4		Solution 5
Temperature/℃	Time/ month	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%
20	1	45.30	3.35	45.84	4.26	45.39	3.29	43.73	4.35	43.78	5.02
	2	42.02	3.02	43.21	5.99	43.74	1.72	43.01	3.93	42.68	1.70
	3	42.41	2.72	42.46	2.68	42.74	1.20	42.84	2.66	42.94	4.68
	6	41.72	1.59	42.54	0.27	42.19	2.37	42.39	1.53	41.84	1.15
	9	41.59	0.11	42.28	3.62	41.52	0.42	42.41	3.04	41.16	6.11
40	1	46.38	3.02	45.64	3.62	45.17	1.20	46.45	3.52	47.58	1.15
	2	41.88	2.34	40.80	4.65	41.54	3.46	42.12	4.14	42.08	3.96
	3	42.01	3.47	40.10	2.94	42.23	4.02	40.39	4.22	40.00	2.59
	6	40.04	8.13	37.65	4.95	41.90	6.65	41.02	4.54	38.97	1.47
	9	40.55	1.49	34.57	6.43	40.51	4.16	40.08	2.55	40.03	1.64
55	1	44.14	2.16	44.33	2.87	45.67	0.95	43.41	1.59	46.55	3.86
	2	39.10	4.05	37.63	4.80	40.63	4.84	39.49	1.72	39.16	1.23
	3	38.56	1.00	34.20	4.91	38.46	2.67	39.93	2.68	39.65	3.57
	6	38.43	2.60	20.59	1.32	39.29	7.61	40.19	0.12	36.85	4.64
	9	38.56	7.21	4.87	5.02	39.00	1.12	38.93	4.99	35.11	3.80
Note: COV—Coefficient of variation.

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表 3 老化后GFRP筋的层间剪切强度

Table 3. Interlaminar shear strength of GFRP bars after aging

Temperature/℃	Time/ month	Solution 1		Solution 2		Solution 3		Solution 4		Solution 5
Temperature/℃	Time/ month	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%
20	1	43.25	4.54	41.87	5.49	41.36	4.32	44.61	4.22	43.18	2.21
	2	42.32	4.60	42.84	1.58	42.96	4.75	41.71	3.97	40.39	4.62
	3	39.92	3.72	40.80	6.17	40.92	3.45	41.29	4.58	40.09	1.46
	6	40.75	5.77	40.77	4.56	40.43	2.35	42.00	8.20	40.49	3.33
	9	43.04	1.03	41.72	0.67	41.96	7.10	41.08	2.88	40.06	7.35
40	1	45.38	3.80	40.70	4.16	43.07	1.97	42.68	3.36	44.53	3.87
	2	40.80	1.23	41.87	3.80	40.55	2.82	41.20	3.48	40.17	2.72
	3	40.57	3.72	40.54	5.28	40.60	4.50	40.90	2.76	40.03	3.20
	6	40.12	4.15	36.53	6.12	40.57	0.80	42.47	8.06	41.79	1.46
	9	42.79	1.31	21.86	3.48	40.63	2.93	41.51	1.79	40.38	2.49
55	1	42.11	4.54	44.02	1.75	42.61	6.67	42.86	1.57	43.67	0.94
	2	40.92	6.34	37.67	9.62	39.93	2.88	41.16	3.18	39.72	4.51
	3	38.99	5.55	31.68	13.99	40.19	1.77	40.75	1.47	40.13	1.91
	6	38.49	4.84	19.90	12.58	39.87	6.02	40.41	4.57	40.45	4.17
	9	37.33	1.54	10.09	14.82	38.81	7.07	39.37	1.07	38.98	1.54

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表 4 老化后CFRP筋的层间剪切强度

Table 4. Interlaminar shear strength of CFRP bars after aging

Temperature/℃	Time/ month	Solution 1		Solution 2		Solution 3		Solution 4		Solution 5
Temperature/℃	Time/ month	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%	Mean/MPa	COV/%
20	1	49.31	1.89	47.88	3.89	47.40	1.41	49.41	3.49	47.71	3.33
	2	46.93	3.57	46.72	2.66	47.33	1.37	47.75	0.85	46.27	5.53
	3	43.48	1.72	45.64	4.22	46.37	5.96	46.30	1.76	45.73	4.14
	6	45.34	2.55	41.06	10.04	46.97	2.80	47.04	3.69	44.77	0.54
	9	44.04	1.16	41.28	9.22	46.60	2.33	45.17	3.07	44.34	3.30
40	1	50.22	2.01	46.24	1.81	47.50	3.70	49.01	1.29	47.45	2.55
	2	44.72	4.53	45.90	8.89	46.17	3.26	47.65	3.63	47.27	3.27
	3	44.52	2.41	39.74	5.03	45.43	7.31	44.47	5.01	46.57	2.17
	6	45.85	3.51	40.66	1.55	45.60	1.76	43.67	5.35	44.80	2.37
	9	45.56	1.35	35.70	8.23	45.50	2.50	43.05	5.02	43.68	1.37
55	1	48.85	4.70	45.87	1.46	47.48	4.70	48.94	5.85	47.37	2.39
	2	45.46	1.89	37.14	8.67	45.24	1.90	46.56	3.17	45.24	2.49
	3	44.71	5.04	30.91	5.62	43.77	3.65	44.48	3.45	45.19	6.92
	6	45.17	2.11	27.72	8.64	45.41	4.67	43.64	3.38	44.61	2.49
	9	42.32	4.08	20.32	15.87	42.78	1.71	42.71	3.38	42.36	3.11

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