Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 68, Issue -, Pages 650-658Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.06.040
Keywords
Mortar; External sulfate attack; Electrochemical impedance spectroscopy; Non-destructive diagnosis; Durability
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Funding
- PIPE-UFPR (Programa Interdisciplinar de Pos-Graduacao em Engenharia e Ciencia dos Materiais da Universidade Federal do Parana)
- COELBA (Companhia de Eletricidade do Estado da Bahia)
- Institutos Lactec CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- ANEEL (Agencia Nacional de Energia Eletrica)
- CNPq [305718/2011-8, 301434/2013-1]
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Samples of reinforced mortar specimens (Sps) were studied over 300 days of exposure in reference, sulfate, and chloride environments. Electrochemical impedance spectroscopy (EIS) was used to investigate external sulfate attack (ESA) in comparison with known chloride models. The study, based on the mortar behavior and its measured electrical properties, highlighted the mechanisms that occur under the pores during the aging. The sulfate samples presented a capacitive behavior at lower frequencies, and the mortar resistance shifted. It was confirmed that EIS is a qualified technique to identify the sulfate attack in concrete by non-destructive methods. (C) 2014 Elsevier Ltd. All rights reserved.
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