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Nanomaterials 2019, 9(2), 288; https://doi.org/10.3390/nano9020288

Electrochemical Characterization and Inhibiting Mechanism on Calcium Leaching of Graphene Oxide Reinforced Cement Composites

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen Durability Center for Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
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Received: 24 January 2019 / Revised: 11 February 2019 / Accepted: 15 February 2019 / Published: 19 February 2019
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Abstract

Calcium leaching is a degradation progress inside hardened cement composites, where Ca2+ ions in cement pore solution can migrate into the aggressive solution. In this work, calcium leaching of graphene oxide (GO) reinforced cement composites was effectively characterized by combined techniques of electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). Inhibiting mechanism of GO on calcium leaching of the composites was also examined. The obtained results show that the diameter of the semi-circle of the Nyquist curves of leached samples with GO addition decreased less than that of controlled samples. After leaching for 35 days, loss rate of model impedance RCCP of leached samples with 0, 0.05, 0.1, 0.15, and 0.2 wt.% GO addition was 94.85%, 84.07%, 79.66%, 75.34%, and 68.75%, respectively. Therefore, GO addition can significantly mitigate calcium leaching of cement composites, since it can absorb Ca2+ ions in cement pore solution, as well as improve the microstructure of the composites. In addition, coupling leaching depth and compressive strength loss were accurately predicted by using the impedance RCCP. View Full-Text
Keywords: graphene oxide; cement composites; calcium leaching; electrochemical impedance spectroscopy; scanning electron microscope; inhibiting mechanism graphene oxide; cement composites; calcium leaching; electrochemical impedance spectroscopy; scanning electron microscope; inhibiting mechanism
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Long, W.-J.; Ye, T.-H.; Li, L.-X.; Feng, G.-L. Electrochemical Characterization and Inhibiting Mechanism on Calcium Leaching of Graphene Oxide Reinforced Cement Composites. Nanomaterials 2019, 9, 288.

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