Materiales de Construcción, Vol 63, No 309 (2013)

Usability of cement paste containing carbon nanofibres as an anode in electrochemical chloride extraction from concrete


https://doi.org/10.3989/mc.2012.03111

B. del Moral
Universidad de Alicante, Spain

Ó. Galao
Universidad de Alicante, Spain

C. Antón
Universidad de Alicante, Spain

M. A. Climent
Universidad de Alicante, Spain

P. Garcés
Universidad de Alicante, Spain

Abstract


In the application of the electrochemical chloride extraction (ECE) technique, traditionally, the Ti-RuO2 wire netting has been used as the external anode. This article provides the results of the research based on the use of conductive cement paste with addition of carbon nanofibers (CNF) as anodes and its application in ECE. The tests were developed in concrete specimens previously contaminated with chloride. The efficiencies achieved were compared with those obtained using a traditional anode (Ti-RuO2) and cement pastes with the addition of other carbonaceous materials. The results show the feasibility of using conductive cement paste with CNF as the anode in the electrochemical extraction of chlorides in concrete, finding similar efficiencies to those obtained with traditional Ti-RuO2 wire netting but with the added advantage that it can be adapted to complex structural geometries as it can be applied as a paste.

Keywords


electrochemical chloride extraction; conductive cement paste; carbon nanofibers; repair

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References


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