海水海砂混凝土中混杂碳-玄武岩纤维筋拉伸性能退化机理及寿命预测

许艾沿; 杜运兴; 潘柳景泰; 朱德举

海水海砂混凝土中混杂碳-玄武岩纤维筋拉伸性能退化机理及寿命预测

1.
湖南大学　土木工程学院, 长沙 410082
2.
中南大学　土木工程学院, 长沙 410083
3.
绿色先进土木工程材料及应用技术湖南省重点实验室(湖南大学), 长沙 410082

基金项目: 国家自然科学基金山东联合基金项目(U1806225)

详细信息

通讯作者:
朱德举，博士，教授，博士生导师，研究方向为纤维增强复合材料及其增强混凝土构件　E-mail: dzhu@hnu.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-10-07
- 修回日期: 2023-11-13
- 录用日期: 2023-11-27
- 网络出版日期: 2023-12-09
- 刊出日期: 2024-07-15

Degradation mechanism of tensile properties and life prediction of hybrid carbon/basalt fiber reinforced polymer bars in seawater sea-sand concrete

1.
School of Civil Engineering, Hunan University, Changsha 410082, China
2.
School of Civil Engineering, Central South University, Changsha 410083, China
3.
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, Hunan University, Changsha 410082, China

Funds: National Natural Science Foundation Shandong joint fund project (U1806225)

摘要

摘要: 为了研究海水浸泡下海水海砂混凝土(Seawater sea-sand concrete,SSC)中以环氧树脂为基体的混杂碳-玄武岩纤维复材筋(CF-BF/Epoxy)拉伸性能退化规律，在不同温度(25、40和55℃)下对SSC中的CF-BF/Epoxy进行海水浸泡，周期为60、90和120天，通过拉伸试验对CF-BF/Epoxy在SSC中的拉伸性能进行了研究，并利用SEM和FTIR对其微观结构的变化进行了分析。结果显示，环境温度对CF-BF/Epoxy的拉伸性能有明显影响，在55℃下浸泡120d后，抗拉强度下降了13.84%，弹性模量在3%范围内轻微波动，CF-BF/Epoxy出现伪延性；玄武岩纤维和碳纤维混杂延缓了SSC中OH⁻进一步向CF-BF/Epoxy内部侵蚀，而外层玄武岩纤维区域的树脂水解和树脂-纤维界面退化是CF-BF/Epoxy拉伸性能退化的主要原因。最后基于Arrhenius方程预测，嵌入SSC中的CF-BF/Epoxy的抗拉强度保持率将在584~803天内降至70%。
- 混杂碳-玄武岩纤维复材筋 /
- 海水海砂混凝土 /
- 抗拉强度 /
- 退化机理 /
- 寿命预测
Abstract: To investigate the degradation pattern of tensile properties of epoxy resin-based hybrid carbon-basalt fiber reinforcing bars (CF-BF/Epoxy) in seawater sea-sand concrete (SSC) under seawater immersion, the CF-BF/Epoxy in SSC were soaked in seawater at different temperatures (25°C, 40°C, and 55°C) for durations of 60, 90 and 120 days. The tensile performance of the CF-BF/Epoxy in SSC was examined through tensile tests, and the changes in their microstructure were analyzed by SEM and FTIR. The results indicate that ambient temperature significantly affects the tensile properties of CF-BF/Epoxy. After 120 days of immersion at 55°C, the tensile strength decreases by 13.84%, the elastic modulus experiences a slight fluctuation within a 3% range, and pseudo-ductility is observed in the CF-BF/Epoxy. Additionally, blending of basalt fibers and carbon fibers delay the further intrusion of OH^- from SSC into CF-BF/Epoxy, while the hydrolysis of the resin in the outer basalt fiber region and the degradation of the resin-fiber interface are identified as the primary causes of the decline in the tensile properties of CF-BF/Epoxy. Lastly, based on the Arrhenius equation, it is predicted that the tensile strength retention rate of CF-BF/Epoxy embedded in SSC will drop to 70% between 584 and 803 days.
- CF-BF/Epoxy /
- Seawater Sea-sand Concrete /
- tensile strength /
- degradation mechanism /
- life prediction

HTML全文

图 1 CF-BF/Epoxy横截面

Figure 1. Cross section of CF-BF/Epoxy

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图 2 SSC-FRP试件

Figure 2. Specimens of SSC-FRP

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图 3 拉伸性能试验装置

Figure 3. Tensile properties test setup

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图 4 SEM观测试样

Figure 4. SEM observation sample

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图 5 SSC包裹的CF-BF/Epoxy老化后的表面形貌

Figure 5. Surface morphology of CF-BF/Epoxy wrapped by SSC after exposure

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图 6 SSC包裹的CF-BF/Epoxy拉伸破坏形态

Figure 6. Tensile failure models of CF-BF/Epoxy wrapped by SSC

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图 7 SSC包裹的CF-BF/Epoxy老化前后应力-应变曲线

Figure 7. Stress-strain curves of CF-BF/Epoxy wrapped by SSC before and after aging test

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图 8 SSC包裹的CF-BF/Epoxy的拉伸性能

Figure 8. Tensile properties of CF-BF/Epoxy wrapped by SSC

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图 9 SSC包裹的CF-BF/Epoxy在不同老化环境下的FTIR光谱

Figure 9. FTIR spectra of CF-BF/Epoxy wrapped by SSC under different aging conditions

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图 10 SSC包裹的CF-BF/Epoxy SEM观测点位

Figure 10. SEM observation positions of CF-BF/Epoxy specimens wrapped by SSC

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图 11 SSC包裹的CF-BF/Epoxy SEM图像

Figure 11. SEM images of the CF-BF/Epoxy wrapped by the SSC

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图 12 SSC包裹的CF-BF/Epoxy寿命预测拟合曲线

Figure 12. Fitted curves of CF-BF/Epoxy embedded in SSC for life prediction

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图 13 预测CF-BF/Epoxy在指定城市长期拉伸强度的主曲线

Figure 13. Master curves of the predicted long-term tensile strength of HFRP bars in given cities

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表 1 海水海砂混凝土配合比

Table 1. Mixing ratio of seawater sea sand concrete

Raw materials	Cement	Artificial seawater	Coarse aggregate	Sea-sand	Water reducer
Mass/(kg·m⁻³)	370	185	1113	682	0.111
Note:Water reducer agent in kg.

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表 2 人工海水的化学成分

Table 2. Chemical composition of artificial seawater

Composition	NaCl	MgCl₂	Na₂SO₄	CaCl₂	KCl	NaHCO₃
Concentration/(g·L⁻¹)	24.53	5.20	4.09	1.16	0.695	0.201

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表 3 嵌入SSC中CF-BF/Epoxy的加速老化试验

Table 3. Accelerated aging test of CF-BF/Epoxy embedded in SSC

Types of FRP bars	Test environment	Exposure temperature/℃	Exposure period/days	Number of interlaminar shear specimens
CF-BF/Epoxy	Artificial seawater immersion	25	60,90,120	5
		40	60,90,120	5
		55	60,90,120	5

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表 4 CF-BF/Epoxy拉伸性能测试结果

Table 4. Test results of tensile properties of CF-BF/Epoxy

Specimen of FRP bars	Tensile strength			Elastic modulus			Ultimate strain/%
Specimen of FRP bars	Average /MPa	Retention /%	CV/%	Average /GPa	Retention /%	CV/%	Average	Retention /%
HFRP	2437.41	100	1.2	146.87	100	3.3	1.66	100
HT25 D60	2390.00	98.05	1.3	144.84	98.62	1.6	1.65	99.40
HT25 D90	2278.19	93.47	3.6	144.76	98.56	3.4	1.57	94.81
HT25 D120	2260.69	92.75	4.4	143.18	97.49	1.6	1.58	95.12
HT40 D60	2373.33	97.37	4.7	142.49	97.02	3.2	1.67	99.34
HT40 D90	2267.46	93.03	6.6	143.22	97.51	2.0	1.58	95.37
HT40 D120	2217.14	90.96	5.1	142.52	97.04	2.2	1.56	93.72
HT55 D60	2360.00	96.82	1.5	143.60	97.78	2.3	1.64	99.00
HT55 D90	2186.67	89.71	4.2	145.03	98.75	3.9	1.51	90.83
HT55 D120	2100.00	86.16	1.7	145.13	98.82	1.0	1.45	87.17
Note: HFRP denotes unaged CF-BF/Epoxy specimens; HTxDy denotes CF-BF/Epoxy specimens immersed at x°C for y days.

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表 5 CF-BF/Epoxy在SSC中寿命预测的时移因子(F_TS)参数

Table 5. F_TS parameters for life prediction of CF-BF/Epoxy wrapped by SSC

Types of FRP bars	Solution temperature/℃	F_TS
Types of FRP bars	Solution temperature/℃	Qingdao(12.3℃)	Fuzhou(20.1℃)	Haikou(23.8℃)
CF-BF/Epoxy	25	1.33	1.11	1.03
	40	1.81	1.51	1.39
	55	2.39	2.00	1.84

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表 6 不同文献中FRP筋拉伸试验结果和寿命预测结果

Table 6. Tensile test results and life prediction of FRP bars in different literatures

References	Parameters of FRP bar	Exposure condition	Tensile test results		Life prediction
References	Parameters of FRP bar	Exposure condition	Duration/ Days	Tensile strength retention/%	Tensile strength retention/%	Service-life/years	Location
This study	8 mm CF-BF/Epoxy	SSC(pH=13.3)	120(25℃)	92.75	70	2.6	Qingdao(12.3℃)
			90(40℃)	93.03	70	1.8	Fuzhou(20.1℃)
			90(55℃)	89.71	70	1.6	Haikou(23.8℃)
Yi^[15]	8 mmBFRP	SMSSC(pH=12.5)	180(25℃)	86.88	70	5.1	Qingdao(12.3℃)
			90(40℃)	75.42	70	2.4	Fuzhou(20.1℃)
			90(55℃)	60.81	70	1.7	Haikou(23.8℃)
Wang^[16]	6 mmBFRP	Simulated SSC pore solutions(pH=13.4)	63(32℃)	92.7	70	20.4	Hall's Harbor Quay (7.6℃)
			63(40℃)	81.7	70	20.4	Hall's Harbor Quay (7.6℃)
			63(55℃)	26	70	14.6	Waterloo Creek Bridge(9.9℃)
		Natural environments	-		91.6	5	Hall's Harbor Quay (7.6℃)
		Natural environments	-		86.4	6	Waterloo Creek Bridge(9.9℃)
Mufti^[37]	GFRP(E-glass in a vinylester matrix)	Natural environments	-		No significant degradation	5~8	Halls Harbor Wharf
							Joffre Bridge
							Chatham Bridge
							Growchild Trail Bridge
							Waterloo Greek Bridge

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