相对湿度对海水海砂混凝土环境下GFRP筋拉伸性能影响

doi:10.16183/j.cnki.jsjtu.2022.034

上海交通大学学报 ›› 2023, Vol. 57 ›› Issue (2): 148-160.doi: 10.16183/j.cnki.jsjtu.2022.034

所属专题：《上海交通大学学报》2023年“船舶海洋与建筑工程”专题

相对湿度对海水海砂混凝土环境下GFRP筋拉伸性能影响

王文华, 赵齐, 张大旭(), 张沛涪, 陈鹏

上海交通大学船舶海洋与建筑工程学院; 海洋工程国家重点实验室; 上海市公共建筑和基础设施数字化运维重点实验室,上海 200240

收稿日期:2022-02-16 修回日期:2022-06-14 接受日期:2022-06-30 出版日期:2023-02-28 发布日期:2023-03-01
通讯作者: 张大旭 E-mail:daxu.zhang@sjtu.edu.cn.
作者简介:王文华(1998-),硕士生,主要研究方向为FRP-海水海砂混凝土结构.
基金资助:
国家自然科学基金(12072192);上海市自然科学基金(20ZR1429500)

Effects of Relative Humidity on Tensile Property Degradation of GFRP Rebars in Seawater and Sea Sand Concrete Environment

WANG Wenhua, ZHAO Qi, ZHANG Daxu(), ZHANG Peifu, CHEN Peng

School of Naval Architecture, Ocean and Civil Engineering; State Key Laboratory of Ocean Engineering; Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2022-02-16 Revised:2022-06-14 Accepted:2022-06-30 Online:2023-02-28 Published:2023-03-01
Contact: ZHANG Daxu E-mail:daxu.zhang@sjtu.edu.cn.

摘要/Abstract

摘要：

通过建立相对湿度、混凝土孔隙溶液饱和度以及腐蚀反应速率之间定量分析方法,研究了环境相对湿度对海水海砂混凝土环境下玻璃纤维增强聚合物(GFRP)筋力学性能的影响规律.利用混凝土孔隙尺寸分布函数和孔隙溶液的表面张力公式建立了相对湿度与海水海砂混凝土孔溶液饱和度关系模型;假设孔隙液均匀弥散于混凝土,得到了氢氧根(OH^-)腐蚀离子浓度;借助蚀刻模型计算OH^-作用下GFRP筋的腐蚀速率和强度保留率;利用试验数据验证了分析方法的准确性.根据中国部分沿海城市的气候统计数据,预测了代表性环境温度和水灰比条件下,相对湿度对海水海砂混凝土环境中GFRP筋强度保留率的影响规律,相对湿度的增加促进了GFRP筋的性能退化.结合相关标准规定,得到了海水海砂混凝土环境下GFRP筋的相对湿度与使用年限关系曲线.

关键词: 复合材料, 海水海砂混凝土, 相对湿度, 性能退化, 使用年限

Abstract:

By establishing a quantitative analysis method of relative humidity, pore solution saturation, and corrosion reaction rate of concrete, the influence of environmental relative humidity on the mechanical properties of glass fiber reinforced polymer (GFRP) in seawater sea-sand concrete environment has been studied. Based on the pore size distribution of concrete and the surface tension formula of pore solution, the relationship between the relative humidity and pore solution saturation of seawater sea-sand concrete is established. It is assumed that the pore solution is uniformly smeared in concrete. Therefore, the concentration of corrosive ion OH^- can be obtained. The corrosion rate and strength retention rate of GFRP bars under the action of OH^- are evaluated using the etching model. The accuracy of the current method is verified by experimental results. Based on the climate statistics of some coastal cities in China, the influence of relative humidity on the strength retention rate of GFRP bars in seawater and sea sand concrete environment is predicted under the conditions of representative ambient temperature and water-cement ratio. The increase of relative humidity promotes the performance degradation of GFRP bars. According to relevant standards, the relations between relative humidity and service life of GFRP bars in seawater sea-sand concrete environment have been predicted.

Key words: composites, seawater and sea sand concrete, relative humidity, property degradation, service life

中图分类号:

TU528.59

王文华, 赵齐, 张大旭, 张沛涪, 陈鹏. 相对湿度对海水海砂混凝土环境下GFRP筋拉伸性能影响[J]. 上海交通大学学报, 2023, 57(2): 148-160.

WANG Wenhua, ZHAO Qi, ZHANG Daxu, ZHANG Peifu, CHEN Peng. Effects of Relative Humidity on Tensile Property Degradation of GFRP Rebars in Seawater and Sea Sand Concrete Environment[J]. Journal of Shanghai Jiao Tong University, 2023, 57(2): 148-160.

图/表 15

图1

表1

图2

图3

图4

表2

溶质参数取值表

溶质	g	$β M X (0)$	$β M X (1)$	$C φ M X$
NaCl	0.108 98	0.077 22	0.251 83	0.001 06
NaOH	0.536 82	0.170 67	-0.084 11	-0.003 42
KCl	0.057 12	0.046 61	0.223 41	-0.000 44
KOH	0.011 99	0.175 01	-0.016 34	-0.002 67

表2

图5

图6

图7

表3

表4

图8

图9

图10

图11

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w/c	φ₁	B₁/nm	φ₂	B₂/nm	φ₃	B₃/nm
0.4	0.431	0.99	0.424	5.02	0.134	32.76
0.5	0.350	1.01	0.469	5.00	0.168	32.05
0.6	0.289	1.02	0.500	5.09	0.196	32.39
0.7	0.243	1.03	0.519	5.26	0.220	33.20

时间/月	H_r=65%			H_r=85%			H_r=95%
时间/月	R_e	R_s	δ	R_e	R_s	δ	R_e	R_s	δ
1	92.5	94.4	2.1	92.0	91.5	0.5	81.2	88.0	8.4
2	90.0	89.0	1.1	84.1	83.4	0.8	71.2	77.3	8.6
3	88.1	84.6	3.9	82.0	76.3	7.0	62.7	66.7	6.4
4	86.7	78.6	9.3	76.9	68.3	11.1	58.3	57.2	1.8

城市名称	平均气温/℃	平均相对湿度/%
大连	12.15	60.00
青岛	13.90	68.35
上海	17.64	74.00
广州	22.30	81.00
海口	24.94	81.20
福州	19.30	76.00
北海	22.90	80.80

相对湿度对海水海砂混凝土环境下GFRP筋拉伸性能影响

Effects of Relative Humidity on Tensile Property Degradation of GFRP Rebars in Seawater and Sea Sand Concrete Environment

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