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Abstract

Effect of Carbon Nanotubes (CNTs) on Chloride Penetration Resistance and Physical-Mechanical Properties of Cementitious Materials †

by
Nikolaos Chousidis
1,*,
Aggeliki Zacharopoulou
2,
George Batis
2 and
Christos Zeris
1,*
1
School of Civil Engineering, Department of Structural Engineering, National Technical University of Athens, 15780 Athens, Greece
2
School of Chemical Engineering, Department of Material Science & Technology, National Technical University of Athens, 15780 Athens, Greece
*
Authors to whom correspondence should be addressed.
Presented at the First Corrosion and Materials Degradation Web Conference, 17–19 May 2021; Available online: https://cmdwc2021.sciforum.net/.
Mater. Proc. 2021, 6(1), 21; https://doi.org/10.3390/CMDWC2021-09934
Published: 8 May 2021
(This article belongs to the Proceedings of The 1st Corrosion and Materials Degradation Web Conference)

Abstract

:
According to currently enforced Eurocode 2 for the design of reinforced concrete structures, it is essential to protect steel reinforcements from corrosion and concrete from degradation under aggressive environmental conditions such as marine, urban, industrial environments and soils, to which these are normally exposed. In this context, this experimental study investigates the enhancement of the physico-mechanical properties of common cement-based mortars and the electro-chemical properties of reinforcing steel, through the addition of nanomaterials in the mix. For the experimental set-up, cylindrical, prismatic, and cubic specimens of different dimensions were cast and were partially immersed in sodium chloride solution for eight months. To evaluate the corrosion of steel rebars, cylindrical cement mortar specimens were used in order to induce a constant cover between exposure and the reinforcement; the physical and the mechanical tests were carried out on standardized shape cubes and prisms, respectively. Two groups were considered: cement-based mortar composites with 0.5 wt.% CNTs addition and plain (reference) specimens without any addition of nanomaterials, for comparison. The influence of adding CNTs on chloride penetration resistance was subsequently evaluated using standardized and non-standardized testing techniques: tests such as flexural strength and porosity, mass loss of steel, electrochemical measurements (corrosion current, HCP) and total chloride content calculation. The test results showed that using CNTs as an addition in mortar production led to the protection of steel rebars against pitting corrosion; moreover, an improvement (almost 9% at 120 days) in flexural strength and reduced porosity of mortars was also observed compared to the reference specimens without CNTs.

Supplementary Materials

The conference presentation file is available at https://www.mdpi.com/article/10.3390/CMDWC2021-09934/s1.

Funding

This research is co-financed by Greece and the European Union (European Social Fund-ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning 2014–2020» in the context of the project “Nanotechnology and metal fibers applications for the resistance of reinforced concrete exposed to highly corrosive environment” (MIS5049426).

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The data presented in this study are available on request from the corresponding authors.

Conflicts of Interest

The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Chousidis, N.; Zacharopoulou, A.; Batis, G.; Zeris, C. Effect of Carbon Nanotubes (CNTs) on Chloride Penetration Resistance and Physical-Mechanical Properties of Cementitious Materials. Mater. Proc. 2021, 6, 21. https://doi.org/10.3390/CMDWC2021-09934

AMA Style

Chousidis N, Zacharopoulou A, Batis G, Zeris C. Effect of Carbon Nanotubes (CNTs) on Chloride Penetration Resistance and Physical-Mechanical Properties of Cementitious Materials. Materials Proceedings. 2021; 6(1):21. https://doi.org/10.3390/CMDWC2021-09934

Chicago/Turabian Style

Chousidis, Nikolaos, Aggeliki Zacharopoulou, George Batis, and Christos Zeris. 2021. "Effect of Carbon Nanotubes (CNTs) on Chloride Penetration Resistance and Physical-Mechanical Properties of Cementitious Materials" Materials Proceedings 6, no. 1: 21. https://doi.org/10.3390/CMDWC2021-09934

APA Style

Chousidis, N., Zacharopoulou, A., Batis, G., & Zeris, C. (2021). Effect of Carbon Nanotubes (CNTs) on Chloride Penetration Resistance and Physical-Mechanical Properties of Cementitious Materials. Materials Proceedings, 6(1), 21. https://doi.org/10.3390/CMDWC2021-09934

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