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Materials 2019, 12(5), 802; https://doi.org/10.3390/ma12050802

Study on the Effect of Graphene Oxide with Low Oxygen Content on Portland Cement Based Composites

1
Laboratory of Composites Materials, Institute of Building Materials, Vilnius Gediminas Technical University, Saulėtekio av. 11, LT-10223 Vilnius, Lithuania
2
Laboratory of Concrete Mechanics, Institute of Mechanics, Riga Technical University, 1 Kalku street, LV-1658 Riga, Latvia
3
Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology “MISIS”, Leninsky Prospect 4, Moscow 119049, Russia
4
Laboratory of Concrete Technologies, Institute of Building Materials, Vilnius Gediminas Technical University, Saulėtekio av. 11, LT-10223 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Received: 6 February 2019 / Revised: 1 March 2019 / Accepted: 4 March 2019 / Published: 8 March 2019
(This article belongs to the Section Construction and Building Materials)
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Abstract

The current study presents research into the effect of graphene oxide (GO) with a carbon to oxygen ratio of 4:1 on the fluidity, hydration, microstructure, mechanical and physical properties of Portland cement pastes and mortars. The amounts of GO investigated were 0.02%, 0.04%, and 0.06% by weight of cement, while for mortars, an extra composition with 0.1% was also prepared. According to the results, the fluidity of cement paste and mortar increased and the hydration process was slightly retarded with the addition of GO. Despite this, improvements in compressive and flexural strength were established in the mortars containing GO. The maximum effects (~22% and ~6%, respectively) were obtained with the addition of 0.06% GO. The calculation of estimated strength proportional to samples of equal density showed that for mortars cured for 7 days the gain in strength was directly related to the gain in density. For mortar samples cured for 28 days, the estimated strength was found to be significantly higher than that of the reference sample, indicating that besides density there are other factors determining the improvement in strength of mortars modified with GO. The possible structure strengthening mechanisms are discussed. View Full-Text
Keywords: graphene oxide; Portland cement; hydration; fluidity; microstructure; compressive strength graphene oxide; Portland cement; hydration; fluidity; microstructure; compressive strength
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kudžma, A.; Škamat, J.; Stonys, R.; Krasnikovs, A.; Kuznetsov, D.; Girskas, G.; Antonovič, V. Study on the Effect of Graphene Oxide with Low Oxygen Content on Portland Cement Based Composites. Materials 2019, 12, 802.

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