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Characterization of Titanium Nanotube Reinforced Cementitious Composites: Mechanical Properties, Microstructure, and Hydration

1
Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea
2
Department of Mechanical Engineering, Biomechacin, Dugas Rd, San Antonio, TX 78251, USA
3
Department of Chemistry, Nuclear and WMD Protection Research Center, Korea Military Academy, Seoul 01805, Korea
4
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843, USA
5
Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA
*
Author to whom correspondence should be addressed.
Materials 2019, 12(10), 1617; https://doi.org/10.3390/ma12101617
Received: 17 April 2019 / Revised: 14 May 2019 / Accepted: 14 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

In recent years, nano-reinforcing technologies for cementitious materials have attracted considerable interest as a viable solution for compensating the poor cracking resistance of these materials. In this study, for the first time, titanium nanotubes (TNTs) were incorporated in cement pastes and their effect on the mechanical properties, microstructure, and early-age hydration kinetics was investigated. Experimental results showed that both compressive (~12%) and flexural strength (~23%) were enhanced with the addition of 0.5 wt.% of TNTs relative to plain cement paste at 28 days of curing. Moreover, it was found that, while TNTs accelerated the hydration kinetics of the pure cement clinker phase (C3S) in the early age of the reaction (within 24 h), there was no significant effect from adding TNTs on the hydration of ordinary Portland cement. TNTs appeared to compress the microstructure by filling the cement paste pore of sizes ranging from 10 to 100 nm. Furthermore, it could be clearly observed that the TNTs bridged the microcracks of cement paste. These results suggested that TNTs could be a great potential candidate since nano-reinforcing agents complement the shortcomings of cementitious materials. View Full-Text
Keywords: cementitious composite; TNT; nano-reinforcing; mechanical properties; hydration cementitious composite; TNT; nano-reinforcing; mechanical properties; hydration
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Jee, H.; Park, J.; Zalnezhad, E.; Jeong, K.; Woo, S.M.; Seok, S.; Bae, S. Characterization of Titanium Nanotube Reinforced Cementitious Composites: Mechanical Properties, Microstructure, and Hydration. Materials 2019, 12, 1617.

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