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A platform for research: civil engineering, architecture and urbanism
Application of carbon-fiber-reinforced polymer anode in electrochemical chloride extraction of steel-reinforced concrete
Highlights Chloride was extracted from steel-reinforced concrete via electrochemical chloride extraction (ECE). Carbon-fiber-reinforced polymer (CFRP) served as external anode. Steel–concrete bond loss varied with samples’ water–cement ratio and applied current density. CFRP anode performance showed no significant degradation after ECE treatment. ECE efficiency was compatible with that shown using activated titanium mesh anode.
Abstract A carbon-fiber-reinforced polymer (CFRP) was adopted as an external anode in the electrochemical chloride extraction (ECE) of cylindrical steel-reinforced concrete samples with different water–cement ratios and chloride introduced during casting. Three constant current densities were applied between the steel cathode and CFRP anode, with the internal steel bar used as the cathode. The chloride extraction ratio, proportion of residual chloride, and Cl−/OH− ratio were obtained to assess the ECE efficiency; pullout tests were conducted to evaluate the post-ECE bonding characteristics between steel and concrete. A microscopic evaluation of both concrete and CFRP showed that the CFRP anode did not experience severe degradation after ECE. Comparison of the performance by using activated titanium mesh anodes confirmed the feasibility of ECE with an external CFRP anode.
Application of carbon-fiber-reinforced polymer anode in electrochemical chloride extraction of steel-reinforced concrete
Highlights Chloride was extracted from steel-reinforced concrete via electrochemical chloride extraction (ECE). Carbon-fiber-reinforced polymer (CFRP) served as external anode. Steel–concrete bond loss varied with samples’ water–cement ratio and applied current density. CFRP anode performance showed no significant degradation after ECE treatment. ECE efficiency was compatible with that shown using activated titanium mesh anode.
Abstract A carbon-fiber-reinforced polymer (CFRP) was adopted as an external anode in the electrochemical chloride extraction (ECE) of cylindrical steel-reinforced concrete samples with different water–cement ratios and chloride introduced during casting. Three constant current densities were applied between the steel cathode and CFRP anode, with the internal steel bar used as the cathode. The chloride extraction ratio, proportion of residual chloride, and Cl−/OH− ratio were obtained to assess the ECE efficiency; pullout tests were conducted to evaluate the post-ECE bonding characteristics between steel and concrete. A microscopic evaluation of both concrete and CFRP showed that the CFRP anode did not experience severe degradation after ECE. Comparison of the performance by using activated titanium mesh anodes confirmed the feasibility of ECE with an external CFRP anode.
Application of carbon-fiber-reinforced polymer anode in electrochemical chloride extraction of steel-reinforced concrete
Zhu, Ji-Hua (author) / Wei, Liangliang (author) / Wang, Zhaohua (author) / Liang, Cheng Ke (author) / Fang, Yuan (author) / Xing, Feng (author)
Construction and Building Materials ; 120 ; 275-283
2016-05-12
9 pages
Article (Journal)
Electronic Resource
English
CFRP , carbon-fiber-reinforced polymer , ECE , electrochemical chloride extraction , EDS , energy-dispersive spectroscopy , ICCP , impressed current cathodic protection , PVC , polyvinyl chloride , SEM , scanning electron microscopy , <italic>D</italic> , diameter of steel bar embedded in concrete , <italic>L</italic> <inf>1</inf> , test region of steel bar , <italic>L</italic> <inf>2</inf> , masked region of steel bar , <italic>A</italic> <inf>steel</inf> , test area of steel bar , <italic>i</italic> , current density applied to the test area of steel bar , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>w</mi></mrow> <mrow><mn>12</mn> <mo>_</mo> <msup><mrow><mtext>Cl</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , total chloride extraction on the 12th day , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>w</mi></mrow> <mrow><mn>28</mn> <mo>_</mo> <msup><mrow><mtext>Cl</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , total chloride extraction on the 28th day , <italic>f</italic> <inf>max</inf> , maximum bond obtained in pullout test , <italic>δ</italic> <inf>loss</inf> , bond loss of test samples due to ECE treatment , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>w</mi></mrow> <mrow><msup><mrow><mtext>Cl</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , chloride extraction ratio at two-day intervals , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>m</mi></mrow> <mrow><msup><mrow><mtext>Cl</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , mass of chloride obtained by titrating the electrolyte solution at two-day intervals , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>M</mi></mrow> <mrow><msup><mrow><mtext>Cl</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , total mass of chloride in the NaCl-modified mixing solution used for concrete casting , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>n</mi></mrow> <mrow><msup><mrow><mtext>OH</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , concentration of OH<sup>−</sup> , pH , pH value of solution , <italic>P</italic> <inf>max</inf> , maximum drawing force , <italic>f</italic> <inf>0_max</inf> , maximum bond of control sample in each series , <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mrow><mi>k</mi></mrow> <mrow><msup><mrow><mtext>Cl</mtext></mrow> <mrow><mo>-</mo></mrow></msup></mrow></msub></mrow></math> , Cl<sup>−</sup>/cement ratio after ECE treatment , <italic>W</italic> , Cl<sup>−</sup>/OH<sup>−</sup> ratio after ECE treatment , <italic>f</italic> , steel–concrete bond obtained in pullout test , <italic>P</italic> <inf>cr</inf> , critical load in a typical pullout load vs. displacement curve , <italic>U<sup>∗</sup></italic> , displacement in a typical pullout load vs. displacement curve , Electrochemical chloride extraction , Pullout tests , Microscopic examination
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016