Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 161, Issue -, Pages 577-586Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.11.123
Keywords
Fly ash blended cement materials; Chloride transport; Electrochemical impedance spectroscopy; Modeling; Equivalent circuit; Prediction
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Funding
- National Natural Science Foundation of China [51478270/51538007/U1301241]
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The chloride transport behavior of fly ash blended cement material was investigated in this study by using electrochemical impedance spectroscopy (EIS). The chloride penetration was studied by means of EIS. A new equivalent circuit model was applied to describe the electrochemical system of fly ash blended cementitious materials. Experimental results demonstrate that the increase in the fly ash replacement ratio of sample can increase the penetration depth of chloride ion. In addition, the increase in the fly ash replacement ratio of sample can enlarge the Nyquist curve semi-circle, and improve ion transfer resistance at the solid-liquid phase interface. We determined the quantitative relationship between electrochemical properties and chloride penetration depth in order to successfully predict the chloride ion penetration depth of blended cements with varying fly ash content. It is expected to complement the existing test standards regarding the durability evaluation of construction materials. (C) 2017 Elsevier Ltd. All rights reserved.
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