Evolutionary regularity of bond property for reinforced concrete after electrochemical rehabilitation
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摘要: 針對電化學修復技術導致修復后結構內鋼筋混凝土黏結性能退化問題，通過中心拉拔實驗獲取電化學修復后鋼筋混凝土黏結滑移曲線，研究電化學修復參數（電流密度和通電時間）對鋼筋混凝土黏結性能的影響規律，通過實驗結果進行模型參數分析，建立基于電流密度和通電時間兩個控制變量的黏結強度劣化模型。研究結果表明：電通量較小的情況下，鋼筋混凝土黏結性能損失較小；不控制通電參數的電化學修復技術導致黏結強度下降明顯，采用5 A·m–2的電流開展28 d的恒電流通電，試件的最大黏結力損失量高達56.9%；本文提出的劣化模型可以定量表征電化學修復后試件黏結強度折減情況，模型的數值模擬結果與本文及其他文獻的實驗結果均有較好的一致性，相關系數分別為0.9606和0.9745。Abstract: Reinforcement corrosion, due to the presence of chloride ions, is a major cause of the degradation of reinforced concrete structures. Nowadays, electrochemical rehabilitation (ER) is becoming a common technique for repairing reinforced structures. Due to the transmission properties of the micro-pores in concrete, chloride ions can be transferred to the outside of the concrete through the pores under the driven force of electric field. Compared with other conventional technologies, ER presents many advantages, such as high efficiency and little influence on the environment and surroundings. However, previous studies indicate that ER exhibits negative effect on the interfacial bonding properties of steel concrete. As the main influence factor for ER, varying current densities may consequently change the bond loss between steel and concrete. In addition, large current density significantly reduces interfacial bond. However, current studies lack relevant quantitative research results and fail to propose an effective method to solve the problem after electrochemical repair since aiming at electrochemical rehabilitation will most likely result in the bond deterioration of reinforced concrete. In this study, the bond-slip curves were obtained through central pull-out specimens after ER with various electrochemical parameters, and the relationship between the electrochemical parameters (current density and conduction time) and the bond behaviors were investigated. Finally, a degradation model of bond strength considering the influences of the two parameters mentioned was established. Results show that the bond strength decreases significantly with high current density and long conduction time. Using a current density of 5 A·m–2, reduction of the max bond force increased up to 22.6% and 56.9% under a conduction time of 15 and 28 d, respectively. The proposed model can be used to quantitatively characterize the reduction of bond strength after electrochemical rehabilitation. Good consistency of results was observed after comparing the evaluated results with that of the experiment.
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圖 2 通電裝置示意圖
Figure 2. Schematic of experimental setup for electrochemical rehabilitation
圖 4 不同電流密度下的黏結–滑移曲線。（a）1 A·m–2；（b）3 A·m–2；（c）5 A·m–2
Figure 4. Bond force–slip curves under different current densities: (a) 1 A·m?2; (b) 3 A·m?2; (c) 5 A·m?2
圖 6 不同電流密度下最大黏結力損失量
Figure 6. Maximum bond force loss amount under different current densities
圖 8 不同通電時間下最大黏結力損失量
Figure 8. Maximum bond force loss amount under different conduction times
圖 9 三維折減模型與本文實驗值
Figure 9. Three-dimensional deterioration mode and experimental data of this paper
圖 11 折減模型與實驗值對比
Figure 11. Comparison between deterioration mode and experimental data
表 1 C30混凝土配合比
Table 1. Mix proportion of C30 concrete specimen
kg·m–3 Water Cement Sand Gravel 202 382 751 1157 
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表 2 實驗試件分組情況表
Table 2. Electrochemical parameters design
Sample Current density / (A·m–2) Conduction time / d I1-D7 1 7 I1-D15 1 15 I1-D28 1 28 I3-D7 3 7 I3-D15 3 15 I3-D28 3 28 I5-D7 5 7 I5-D15 5 15 I5-D28 5 28
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表 3 拉拔實驗最大黏結力
Table 3. Maximum force of pull-out test
Sample Maximum force/kN Average force/kN Average
bond stress/
MPaAverage reduced value Sample 1 Sample 2 Sample 3 I0-D0 44.34 54.72 51.80 50.29 16.34 1.000 I1-D7 50.16 50.58 49.76 50.17 16.30 0.998 I1-D15 49.21 49.86 49.54 49.54 16.10 0.985 I1-D28 46.81 45.69 50.49 47.66 15.49 0.948 I3-D7 49.06 49.68 51.74 50.16 16.04 0.997 I3-D15 42.41 48.50 45.83 45.58 12.45 0.906 I3-D28 42.15 42.91 44.86 43.31 14.07 0.861 I5-D7 47.18 49.20 51.34 49.24 16.00 0.979 I5-D15 35.11 39.06 42.54 38.90 12.64 0.774 I5-D28 17.71 27.80 19.57 21.69 7.70 0.431
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表 4 擬合值與實驗值對比
Table 4. Comparison between analysis results and experimental results
Reference Sample Practical reduced value Formula reduced value Reference Sample Practical reduced value Formula reduced value This paper I0-D0 1.000 1.000 Lin et al.
(25 ℃)[25]I1-D28 0.949 0.947 I1-D7 0.998 0.994 I2-D28 0.876 0.905 I1-D15 0.985 0.979 I3-D28 0.832 0.820 I1-D28 0.948 0.947 Hao et al.
(Nature corrosion)[26]I1-D28 0.950 0.947 I3-D7 0.997 0.981 I2-D28 0.880 0.905 I3-D15 0.906 0.929 I3-D28 0.870 0.820 I3-D28 0.861 0.820 Liu et al.[27] I1-D28 0.948 0.947 I5-D7 0.979 0.933 I1-D42 0.922 0.907 I5-D15 0.774 0.778 I2-D28 0.879 0.905 I5-D28 0.431 0.462 I2-D42 0.821 0.831 I3-D28 0.810 0.820 I3-D42 0.755 0.682
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