海水环境下GFRP筋⁃海水海砂混凝土黏结行为演化规律

doi:10.19491/j.issn.1001-9278.2022.12.014

中国塑料 ›› 2022, Vol. 36 ›› Issue (12): 92-99.DOI: 10.19491/j.issn.1001-9278.2022.12.014

海水环境下GFRP筋⁃海水海砂混凝土黏结行为演化规律

金清平(), 周典, 胡岩磊

武汉科技大学城市建设学院，武汉 430081

收稿日期:2022-08-31 出版日期:2022-12-26 发布日期:2022-12-20
作者简介:金清平（1975—），男，博士，教授，从事FRP性能及其工程结构研究，jinqingping@wust.edu.cn
基金资助:
国家自然科学基金资助项目(51808419);建筑结构加固改造与地下空间工程教育部重点实验室开放课题(MEKL202005)

Evolution of bonding behavior of GFRP reinforcement⁃seawater⁃sea sand concrete under seawater conditions

JIN Qingping(), ZHOU Dian, HU Yanlei

School of Urban Construction，Wuhan University of Science and Technology，Wuhan 430081，China

Received:2022-08-31 Online:2022-12-26 Published:2022-12-20

摘要/Abstract

摘要：

为研究海水环境下GFRP筋与海水海砂混凝土的黏结行为，设计并测试了54个GFRP筋⁃海水海砂混凝土中心拉拔试件，采用温度加速实验，研究清水和海水环境腐蚀后试件黏结强度的变化，并分析了试件的黏结滑移曲线上升段。结果表明，海水温度的升高加速了GFRP筋⁃海水海砂混凝土试件黏结强度的退化，在相同浸泡条件下，60 ℃的黏结强度相较于10 ℃降低了15 %左右；海水环境对试件黏结强度的影响略大于清水环境。分别使用BPE模型、CMR模型和Malvar模型对试件黏结滑移曲线上升段进行分析，结果表明，海水环境下GFRP筋⁃海水海砂混凝土黏结滑移曲线上升段宜采用Malvar模型。最后根据TSF寿命预测法得出，在20 ℃海水环境下，GFRP筋⁃海水海砂混凝土试件使用100年后的黏结强度保留率为65.58 %。

关键词: 玻璃纤维增强塑料筋, 海水海砂混凝土, 海水环境, 黏结滑移曲线, 寿命预测

Abstract:

To investigate the bonding behavior of GFRP bars and seawater⁃sea sand concrete under seawater environment， totally 54 GFRP bars⁃seawater⁃sea sand concrete center pullout specimens were designed and tested. A temperature acceleration experiment was conducted to study the changes of bond strength of the specimens after corrosion in the clear water and seawater environments， and the rising section of the bond slip curve of specimens was analyzed. The results indicated that the increase of temperature accelerated the degradation of bond strength of GFRP reinforcement⁃seawater⁃sea sand concrete specimens. The bond strength decreased by about 15% at 60 ºC compared to that at 10 ºC. The effect of the seawater condition on the bond strength of the specimens is slightly more significant than that of the clear water condition. The rising section of the bond slip curve of the specimens was analyzed using the BPE， CMR， and Malvar models， and the results indicated that the Malvar model was suitable for the rising section of the bond slip of GFRP reinforcement⁃seawater⁃sea sand concrete under the seawater condition. According to the TSF life prediction， the bond strength of the GFRP reinforcement⁃seawater⁃sea sand concrete specimens presented a retention rate of 65.58 % after 100 years of use under the 20 ºC seawater condition.

Key words: glass?fiber?reinforcement polymer bar, seawater sea?sand concrete, seawater conditions, bond?slip curve, bond strength prediction

中图分类号:

TQ 327.1

金清平, 周典, 胡岩磊. 海水环境下GFRP筋⁃海水海砂混凝土黏结行为演化规律[J]. 中国塑料, 2022, 36(12): 92-99.

JIN Qingping, ZHOU Dian, HU Yanlei. Evolution of bonding behavior of GFRP reinforcement⁃seawater⁃sea sand concrete under seawater conditions[J]. China Plastics, 2022, 36(12): 92-99.

图/表 17

盐份

NaCl

MgCl₂

Na₂SO₄

CaCl₂

KCl

质量浓度

/g•L^-1

表1 人工海水配比

Tab.1 Artificial seawater composition

图1 拉拔试件示意图（尺寸单位：mm）

Fig.1 Schematic diagram of a pull⁃out specimen （dimension units： mm）

腐蚀环境	腐蚀温度/℃	腐蚀周期/d	F_max/kN	s_max/mm	τ_max/MPa
清水	10	3.65	130.05	30.65	20.70
		18.00	128.65	31.65	20.49
		36.5	126.60	29.73	20.16
	40	3.65	128.95	29.35	20.53
		18.00	121.75	31.18	19.39
		36.5	115.55	31.56	18.40
	60	3.65	126.40	33.13	20.13
		18.00	119.65	30.44	19.05
		36.5	108.15	29.53	17.22
海水	10	3.65	129.75	28.76	20.66
		18.00	127.95	31.47	20.37
		36.5	126.75	29.45	20.18
	40	3.65	125.45	27.16	19.98
		18.00	123.35	26.72	19.64
		36.5	112.65	28.84	17.94
	60	3.65	123.80	26.90	19.71
		18.00	116.75	28.17	18.59
		36.5	106.35	28.67	16.93

表2 GFRP筋⁃海水海砂混凝土黏结性能试验结果

Tab.2 Bond test results of all the GFRP⁃seawater sea sand concrete specimens

图2 试件受力示意图

Fig.2 Schematic diagram of the force on the specimen

破坏条件	破坏模式
f₁>τ_u &f₂<f_t	拔出破坏
f₁<τ_u &f₂>f_t	劈裂破坏
F>F_u	GFRP筋拉断破坏

表3 试件破坏模式与破坏条件

Tab.3 Failure modes and conditions of all the specimens

图3 试件破坏形态

Fig.3 Specimen failure form

图4 不同温度下试件的黏结强度保留率

Fig.4 Retention rate of bond strength of specimens at different temperature

图5 不同腐蚀环境下试件的黏结强度保留率

Fig.5 Retention rate of bond strength of specimens at different conditions

图6 GFRP筋⁃海水海砂混凝土黏结性能退化机理

Fig. 6 Degradation mechanism of GFRP bar⁃seawater⁃sea sand concrete bond performance

黏结滑移本构模型	黏结滑移模型表达式
BPE	$τ τ 1 = s s 1 α s ≤ s 1; τ = τ 1 s 1 ≤ s ≤ s 2; τ = τ 1 - τ 1 - τ 2 s 2 - s 3 s 2 - s s 2 ≤ s ≤ s 3; τ = τ 3 s > s 3$
mBPE	$τ τ 1 = s s 1 α s ≤ s 1; τ τ 1 = 1 - p s s 1 - 1 s 1 ≤ s ≤ s 3; τ = τ 3 s > s 3$
Malvar	$τ τ m = F (s / s m) + (G - 1) (s / s m) 2 1 + (F - 2) (s / s m) + G (s / s m) 2; τ f t = A + B 1 - e - C σ f t; s m = D + E σ$
CMR	$τ = τ m a x 1 - e - s s r β$

黏结滑移本构模型	黏结滑移模型表达式
BPE	$τ τ 1 = s s 1 α s ≤ s 1; τ = τ 1 s 1 ≤ s ≤ s 2; τ = τ 1 - τ 1 - τ 2 s 2 - s 3 s 2 - s s 2 ≤ s ≤ s 3; τ = τ 3 s > s 3$
mBPE	$τ τ 1 = s s 1 α s ≤ s 1; τ τ 1 = 1 - p s s 1 - 1 s 1 ≤ s ≤ s 3; τ = τ 3 s > s 3$
Malvar	$τ τ m = F (s / s m) + (G - 1) (s / s m) 2 1 + (F - 2) (s / s m) + G (s / s m) 2; τ f t = A + B 1 - e - C σ f t; s m = D + E σ$
CMR	$τ = τ m a x 1 - e - s s r β$

表4 常见黏结滑移本构模型

Tab.4 Common bond⁃slip constitutive model

表4 常见黏结滑移本构模型

Tab.4 Common bond⁃slip constitutive model

图7 清水36.5 d拟合曲线

Fig.7 36.5 d fitting curve of clear water

图8 海水36.5 d拟合曲线

Fig.8 36.5 d fitting curve of seawater

图9 拟合相关系数

Fig.9 Mean value of correlation coefficient

相关系数（R²）	总数	均值	标准差	方差	变异系数
BPE	18	0.983 9	0.011 9	1.417 8×10^-4	0.012 1
CMR	18	0.978 2	0.009 6	9.139 2×10^-5	0.009 8
Malvar	18	0.994 6	0.003 1	9.813 6×10^-6	0.003 2

表5 拟合曲线相关系数离散性分析

Tab.5 Dispersion analysis of the correlation coefficient of the fitted curve

图10 黏结强度保留率⁃腐蚀周期双对数拟合曲线

Fig.10 Bond strength retention ⁃ corrosion cycle double logarithmic fitting curves

环境温度/℃	清水环境		海水环境
环境温度/℃	40	60	40	60
达到80 %强度保留率所需时间/d	371	88	404	64
TSF（参考温度40 ℃）	1	4.216	1	6.312 5

表6 清水和海水环境不同温度下GFRP筋⁃海水海砂混凝土预测服役时间

Tab.6 Predicted service time of GFRP reinforcement⁃seawater marine sand concrete under different temperatures in clear water and seawater environment

图11 清水和海水环境下GFRP筋⁃海水海砂混凝土黏结强度预测

Fig.11 Prediction of bond strength of GFRP reinforcement⁃seawater marine sand concrete under clear water and seawater environment

参考文献 30

1	ZHAO Yifan， HU Xiang， SHI Caijun， et al. A review on seawater sea⁃sand concrete： Mixture proportion， hydration， microstructure and properties［J］. Construction and Building Materials， 2021，295：123602.
2	GUO Menghuan， HU Biao， XING Feng， et al. Characterization of the mechanical properties of eco⁃friendly concrete made with untreated sea sand and seawater based on statistical analysis［J］. Construction and Building Materials， 2020，234：117339.
3	Pranavan S， Srinivasan G. Investigation on behaviour of M⁃sand and sea sand based concrete［J］. Materials Today ： Proceedings， 2021，45：7 079⁃7 085.
4	ZHOU Jikai， HE Xu， ZHANG Lunchao. CT characteristic analysis of sea⁃sand concrete exposed in simulated marine environment［J］. Construction and Building Materials， 2021，268： 121170.
5	Falah M W. Effect of seawater for mixing and curing on structural concrete［J］. The IES Journal Part A： Civil & Structural Engineering， 2010，3（4）： 235⁃243.
6	Etxeberria M， Fernandez J M， Limeira J. Secondary aggregates and seawater employment for sustainable concrete dyke blocks production： case study［J］. Construction and Building Materials， 2016，113：586⁃595.
7	Vafaei D， Hassanli R， Ma X， et al. Sorptivity and mechanical properties of fiber⁃reinforced concrete made with seawater and dredged sea⁃sand［J］. Construction and Building Materials， 2021，270：121436.
8	中国桥梁工程学术研究综述：2021［J］. 中国公路学报， 2021，34（02）：1⁃97.
	Review on China's Bridge Engineering Research： 2021［J］. China Journal of Highway and Transport， 2021， 34（02）： 1⁃97.
9	Altalmas A， El Refai A， Abed F. Bond degradation of basalt fiber⁃reinforced polymer （BFRP） bars exposed to accelerated aging conditions［J］. Construction and Building Materials， 2015，81：162⁃171.
10	YAN Fei， LIN Zhibin. Bond durability assessment and long⁃term degradation prediction for GFRP bars to fiber⁃reinforced concrete under saline solutions［J］. Composite Structures， 2017，161：393⁃406.
11	高婧，范凌云. CFRP筋与海水海砂混凝土黏结性能试验与机制分析［J］. 复合材料学报， 2022，39（03）：1 194⁃1 204.
	GAO J， FAN L Y. Experiment on bond performance between CFRP bar and seawater sea sand concrete and its working mechanism［J］. Acta Materiae Compositae Sinica， 2022，39（03）：1 194⁃1 204.
12	ZHOU Jikai， CHEN Xudong， CHEN Shixue. Durability and service life prediction of GFRP bars embedded in concrete under acid environment［J］. Nuclear Engineering and Design， 2011，241（10）：4 095⁃4 102.
13	DONG Zhiqiang， GANG Wu， BO Xu， et al. Bond performance of alkaline solution pre⁃exposed FRP bars with concrete［J］. Magazine of Concrete Research， 2018，70（17）：1⁃31.
14	DONG Zhiqiang， WU Gang， ZHAO Xiaoling， et al. Long⁃term bond durability of fiber⁃reinforced polymer bars embedded in seawater sea⁃sand concrete under ocean environments［J］. Journal of Composites for Construction， 2018，22（5）， 04018042.
15	DONG Zhiqiang， WU Gang， XU Bo， et al. Bond durability of BFRP bars embedded in concrete under seawater conditions and the long⁃term bond strength prediction［J］. Materials and design， 2016，92：552⁃562.
16	CHANG Yufei， WANG Yanlei， WANG Mifeng， et al. Bond durability and degradation mechanism of GFRP bars in seawater sea⁃sand concrete under the coupling effect of seawater immersion and sustained load［J］. Construction and Building Materials， 2021，307：124878.
17	ASTM. Standard practice for the preparation of substitute ocean water：［S］.ASTM International，2021.
18	Guide for the design and construction of structural concrete reinforced with FRP bars： ACI 440.1R-15 ［S］. Farmington Hills： American Concrete Institute， 2015.
19	Davalos J F， Chen Y， Ray I. Effect of FRP bar degradation on interface bond with high strength concrete［J］. Cement & Concrete Composites， 2008，30（8）：722⁃730.
20	HU Xiaolong， XIAO Jiangzhuang， ZHANG Kaijian， et al. The state⁃of⁃the⁃art study on durability of FRP reinforced concrete with seawater and sea sand［J］. Journal of Building Engineering， 2022，51， 104294.
21	LIU Tianqiao， LIU Xing， FENG Peng. A comprehensive review on mechanical properties of pultruded FRP composites subjected to long⁃term environmental effects［J］. Composites Part B： Engineering， 2020，191：107958.
22	Mikols W J， Seferis J C， Apicella A， et al. Evaluation of structural changes in epoxy systems by moisture sorption⁃desorption and dynamic mechanical studies［J］. Polymer composites， 1982，3（3）：118⁃124.
23	Won J， Lee S， Kim Y， et al. The effect of exposure to alkaline solution and water on the strength–porosity relationship of GFRP rebar［J］. Composites Part B： Engineering， 2008，39（5）：764⁃772.
24	PI Zhengyu， XIAO Huigang， DU Junjie， et al. Interfacial microstructure and bond strength of nano⁃SiO₂⁃coated steel fibers in cement matrix［J］. Cement and Concrete Composites， 2019，103：1⁃10.
25	Eligehausen， R， Popov E， Bertero V. Local bond stress⁃slip relationships of deformed bars under generalized excitations： experimental results and analytical mode［J］. Earthquake Engineering Research Center， 1983：69⁃80.
26	Cosenza E， Manfredi G， Realfonzo R. Analytical modelling of bond between FRP reinforcing bars and concrete. Non⁃metallic （FRP） reinforcement for concrete structures［D］. Naples：University of Naples，1995.
27	Malvar L J. Bond stress⁃slip characteristics of FRP rebars［R］. Port Hueneme， California： Naval Facilities Engineering Service Center， 1994.
28	Cosenza E， Manfredi G， Realfonzo R. Behavior and modeling of bond of FRP rebars to concrete［J］. Journal of Composites for Construction， 1997，1（2）：40⁃51.
29	Dejke V， Tepfers R. Durability and service life prediction of GFRP for concrete reinforcement［J］. FRPRCS-5： Fiber⁃reinforced Plastics for Reinforced Concrete Structures， 2001， 1：505⁃514.
30	Bulletin Fib 40.FRP Reinforcement in RC structures［Z］.International Federation for Structural Concrete （fib）， 2007：160.

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海水环境下GFRP筋⁃海水海砂混凝土黏结行为演化规律

Evolution of bonding behavior of GFRP reinforcement⁃seawater⁃sea sand concrete under seawater conditions

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