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Journal of Chinese Society for Corrosion and protection  2018, Vol. 38 Issue (5): 463-470    DOI: 10.11902/1005.4537.2017.168
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Effect of Concrete Inner Environment on Hydrogen Evolution of Rebar During ElectrochemicalRemediation
Mingyuan JIAO1,2, Weiliang JIN1,2, Jianghong MAO2(), Teng LI3, Jin XIA1
1 Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China
2 Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
3 China Energy Engineering Group Zhejiang Electric Design Institute Co., LTD., Hangzhou 310012, China
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Abstract  

Electrochemical remediation is one important method to improve the durability of the existed reinforced concrete structural parts. However, the hydrogen evolution during the reparative process restricts the applied range of electrochemical remediation. The Nernst formula indicated that the equilibrium potential of hydrogen evolution is related to reactant concentration,product concentration and temperature. Accordingly,the equilibrium potential of hydrogen evolution of rebar as a cathode during the electrochemical remediation is related to the inner environment of the concrete under repair. The rationality of measuring current density of hydrogen evolution by potentiodynamic polarization curve is demonstrated in this paper. Then the current density of hydrogen evolution of the rebar embedded in concretes with different water-cement ratio (W /C) is measured. Results indicate that the current density of hydrogen evolution is lower for the rebar embedded in the concrete with lower W /C ratio. Therefore, it is not suitable to adopt a common current density value as a specified index for the controlling of hydrogen evolution during the electrochemical remediation of different concretes.
Key words:  water-cement ratio      Nernst equation      hydrogen evolution      potentiodynamic polarization curve      current density     
Received:  11 October 2017     
ZTFLH:  TU375  
Fund: Supported by National Natural Science Foundation of China (51638013 and 51578490), Natural Science Foundationof Zhejiang Province (LY18E080003) and Ningbo Natural Science Foundation (2016A610215 and 2017A610313)
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Mingyuan JIAO
Weiliang JIN
Jianghong MAO
Teng LI
Jin XIA

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Mingyuan JIAO, Weiliang JIN, Jianghong MAO, Teng LI, Jin XIA. Effect of Concrete Inner Environment on Hydrogen Evolution of Rebar During ElectrochemicalRemediation. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 463-470.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.168     OR     https://www.jcscp.org/EN/Y2018/V38/I5/463

Fig.1  Cathodic overpotential curve under the condition ofconcentration polarization[13]
Fig.2  Cathodic polarization curve of the rebar embeddedin concrete[13]
Fig.3  Side views of specimen (unit: mm)
W/C Water Cement Fine aggregate Coarse aggregate
0.43 188.7 500 592.6 1119
0.48 187 448 646.3 1118.7
0.53 185.3 406 669 1109.7
Table 1  Mix proportion of concrete specimen(kg/m3)
Fig.4  Test device of potentiodynamic polarization curve
Fig.5  Test site map of stomatal scanning
Fig.6  Pictures of testing sample (a) and scanning electron microscopy (b)
Fig.7  Cathodic polarization curves of reinforced concrete specimens with the W/C values of 0.43 (a), 0.48 (b) and 0.53 (c)
Fig.8  First derivatives of cathodic polarization curves of reinforced concrete specimens with the W/C values of 0.43 (a), 0.48 (b) and 0.53 (c)
Specimen W/C=0.43 W/C=0.48 W/C=0.53
1 0.61 0.37 0.19
2 0.66 0.35 0.20
3 0.50 0.31 0.21
4 0.51 0.31 0.27
5 0.50 0.56 0.22
Average value 0.55 0.38 0.22
Standard deviation 0.0743 0.1039 0.0311
Table 2  Hydrogen evolution current densities of reinforced concrete specimens with different values of W/C(unit: A/m2)
Fig.9  pH values of specimens with the different W/Cvalues
Fig.10  Distribution of the diameter of pores around the rebar in the concrete specimens with the different W/C values
Fig.11  SEM images of samples with the W/C values of 0.43 (a), 0.48 (b) and 0.53 (c)
Fig.12  High-magnification SEM images of samples with the W/C values of 0.43 (a), 0.48 (b) and 0.53 (c)
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