TY - JOUR
T1 - Performance of carbon fiber added to anodes of conductive cement-graphite pastes used in electrochemical chloride extraction in concretes
AU - Pellegrini-Cervantes, M. J.
AU - Barrios-Durstewitz, C. P.
AU - Núñez-Jaquez, R. E.
AU - Baldenebro-Lopez, F. J.
AU - Corral-Higuera, R.
AU - Arredondo-Rea, S. P.
AU - Rodriguez-Rodriguez, M.
AU - Llanes-Cardenas, O.
AU - Beltran-Chacon, R.
N1 - Publisher Copyright:
© Korean Carbon Society.
PY - 2018/5
Y1 - 2018/5
N2 - Pollution of chloride ion-reinforced concrete can trigger active corrosion processes that reduce the useful life of structures. Multifunctional materials used as a counter-electrode by electrochemical techniques have been used to rehabilitate contaminated concrete. Cement-based pastes added to carbonaceous material, fibers or dust, have been used as an anode in the non-destructive Electrochemical Chloride Extraction (ECE) technique. We studied the performance of the addition of Carbon Fiber (CF) in a cement-graphite powder base paste used as an anode in ECE of concretes contaminated with chlorides from the preparation of the mixture. The experimental parameters were: 2.3% of free chlorides, 21 days of ECE application, a Carbon Fiber Volume Fraction (CFVF) of 0.1, 0.3, 0.6, 0.9%, a lithium borate alkaline electrolyte, a current density of 4.0 A/m2 and a cement/graphite ratio of 1.0 for the paste. The efficiency of the ECE in the traditional technique using metal mesh as an anode was 77.6% and for CFVF of 0.9% it was 90.4%, with a tendency to increase to higher percentages of the CFVF in the conductive cement-graphite paste, keeping the pH stable and achieving a homogeneous ECE in the mass of the concrete contaminated with chlorides.
AB - Pollution of chloride ion-reinforced concrete can trigger active corrosion processes that reduce the useful life of structures. Multifunctional materials used as a counter-electrode by electrochemical techniques have been used to rehabilitate contaminated concrete. Cement-based pastes added to carbonaceous material, fibers or dust, have been used as an anode in the non-destructive Electrochemical Chloride Extraction (ECE) technique. We studied the performance of the addition of Carbon Fiber (CF) in a cement-graphite powder base paste used as an anode in ECE of concretes contaminated with chlorides from the preparation of the mixture. The experimental parameters were: 2.3% of free chlorides, 21 days of ECE application, a Carbon Fiber Volume Fraction (CFVF) of 0.1, 0.3, 0.6, 0.9%, a lithium borate alkaline electrolyte, a current density of 4.0 A/m2 and a cement/graphite ratio of 1.0 for the paste. The efficiency of the ECE in the traditional technique using metal mesh as an anode was 77.6% and for CFVF of 0.9% it was 90.4%, with a tendency to increase to higher percentages of the CFVF in the conductive cement-graphite paste, keeping the pH stable and achieving a homogeneous ECE in the mass of the concrete contaminated with chlorides.
KW - Concrete rehabilitation
KW - Corrosion current
KW - Graphite powder
KW - Multifunctional material
UR - http://www.scopus.com/inward/record.url?scp=85046422992&partnerID=8YFLogxK
U2 - 10.5714/CL.2018.26.018
DO - 10.5714/CL.2018.26.018
M3 - Artículo
SN - 1976-4251
VL - 26
SP - 18
EP - 24
JO - Carbon Letters
JF - Carbon Letters
IS - 1
ER -