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CARBONLETT, vol. 26, no. 1, pp.18-24, 2018

DOI: DOI: http://dx.doi.org/10.5714/CL.2018.26.018

Performance of carbon fiber added to anodes of conductive cement-graphite pastes used in electrochemical chloride extraction in concretes

M. J. Pellegrini-Cervantes1,♠, C. P. Barrios-Durstewitz1, R. E. Núñez-Jaquez1, F. J. Baldenebro-Lopez1, R. Corral-Higuera1, S. P. Arredondo-Rea1, M. Rodriguez-Rodriguez1, O. Llanes-Cardenas2, and R. Beltran-Chacon3

Affiliation: 1Facultad de Ingeniería Mochis, Universidad Autónoma de Sinaloa. Fuente de Poseidón y Prol. Ángel Flores S/N, Los Mochis, Sinaloa C.P. 81223, México.
2Instituto Politécnico Nacional, Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional (CIIDIR-IPN-Sinaloa)
3Centro de Investigación en Materiales Avanzados, Física de Materiales, Miguel de Cervantes 120, Chihuahua, Chihuahua. C.P. 31109, México.

Abstract: 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.

Keyword: multifunctional material, corrosion current, graphite powder, concrete rehabilitation.