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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (5): 467-473    DOI: 10.11902/1005.4537.2014.191
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Electrochemical Characteristics of Rebar in Polymer-modified Mortar and Resistance to Chloride Ion Penetration of Polymer-modified Concrete
Chenxi LV,Yinghua WEI(),Jing LI,Chao SUN
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

The electrochemical characteristics of rebar in a polymer-modified mortar (PMM) and a common mortar (CM) were comparatively studied by means of electrochemical impedance spectroscopy (EIS), linear polarization (LP) and open circuit potential measurements. The result showed
that the formation rate of passive film on the rebar steel in PMM was slower than that in CM. After the passive film was completely formed, the impedance of the rebar steel in PMM was larger than that in CM. The effect of polymer modification on the resistance to chloride ion penetration of polymer-modified concret (PMC) was evaluated by rapid chloride diffusion coefficient method (RCM)and which on the mechanical property of PMC was also examined. It showed that the addition of polymer can clearly enhanced the resistance to chloride ion penetration and also the mechanical property of the modified concrete.
Key words:  polymer-modified mortar      Cl-      penetration      electrochemical impedance spectroscopy     
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Chenxi LV
Yinghua WEI
Jing LI
Chao SUN

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Chenxi LV, Yinghua WEI, Jing LI, Chao SUN. Electrochemical Characteristics of Rebar in Polymer-modified Mortar and Resistance to Chloride Ion Penetration of Polymer-modified Concrete. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 467-473.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.191     OR     https://www.jcscp.org/EN/Y2015/V35/I5/467

Fig.1  Flow chart of mixing of PMM and PMC
Classification Polymer/Cement Water/Cement Sand/Cement Gravel/Cement Defoamer/Polymer
PMM 0 0.4 2 --- ---
0.15 0.4 2 --- 0.01
PMC 0 0.4 2 3.2 ---
0.03~0.15 0.4 2 3.2 0.01
Table 1  Mix proportion of PMM and PMC
Fig.2  Setting drawing of RCM
Fig.3  Nyquist (a) and Bode (b) plots of rebar in CM block
Fig.4  Nyquist (a) and Bode (b) plots of rebar in PMM block
Fig.5  Equivalent circuit of rebar in CM and PMM block
Dosage of polymer RS / Ωcm2 R1 / Ωcm2 Q1 / Fcm-2 n1 R2 / Ωcm2 Q2 / Fcm-2 n2 Ecorr / %
0 1.245×10-2 2040 8.82×10-7 0.410 4.06×106 2.29×10-5 0.887 3.946×10-2
0.15 0.01 2654 1.59×10-7 0.590 6.37×106 2.14×10-5 0.920 5.114×10-3
Table 2  Results of EIS fitting
Fig.6  Nyquist (a) and phase angle (b) plots of rebar embedded in CM for different time
Fig.7  Nyquist (a) and phase angle (b) plots of rebar embedded in PMM for different time
Time CM PMM
d R2 / Ωcm2 Q2 / Fcm-2 n2 R2 / Ωcm2 Q2 / Fcm-2 n2
2 3.82×105 3.46×10-5 0.870 1.36×105 5.33×10-5 0.821
7 1.27×106 2.94×10-5 0.869 4.39×105 4.58×10-5 0.870
10 1.93×106 2.81×10-5 0.865 7.50×105 4.54×10-5 0.867
14 4.12×106 2.48×10-5 0.885 9.80×105 4.26×10-5 0.880
21 3.98×106 2.46×10-5 0.882 1.83×106 3.28×10-5 0.890
28 4.03×106 2.46×10-5 0.882 4.56×106 2.49×10-5 0.913
35 4.06×106 2.29×10-5 0.887 6.37×106 2.14×10-5 0.921
Table 3  EIS fitting results of rebar in CM and PMM blocks
Fig.8  Comparison of R2 of rebar in CM and PMM
Fig.9  Comparison of impedance obtained by LP and EIS for rebar in CM (a) and PMM (b)
Fig.10  Corrosion potential of rebar in CM and PMM
Fig.11  DRCM of Cl- in concrete containing different dosages of polymer
Fig.12  Axial compressive strength (a) and bending strength (b) of PMC
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