Abstract
Carbon nanotubes are often used to enhance mechanical performance or to change electrical or heat conductivity properties of concrete. In many cases the benefits arising from a modification of concretes by carbon nanotubes are limited due to an insufficient linkage of the nanoparticles to the matrix. Additionally, the hydrophobic nature of the material hinders an efficient incorporation and thus homogeneous distribution in the cementitious matrix. To improve interaction of carbon nanotubes with cement-based binders the nanoparticles were coated with highly reactive SiO2. The modification was done by an adapted sol-gel process to achieve a coating thickness of 10–20 nm. The nanotubes were characterized in terms of morphology, SiO2 content and specific surface area. As a first step the interaction of the modified nanoparticles with a hydrating tricalcium silicate was investigated and showed high pozzolanic reactivity, strong acceleration of hydration as well as changes of the calcium silicate hydrate morphology.
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Acknowledgments
This research was performed in the frame of CarboBau, a subproject of Inno. CNT, which is an interdisciplinary innovation alliance, funded by the German Federal Ministry of Education and Research.
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Butters, V., Kowald, T., Mahjoori, M., Trettin, R. (2015). Surface Modified Carbon Nanotubes for an Enhanced Interaction with Cement Based Binders. In: Sobolev, K., Shah, S. (eds) Nanotechnology in Construction. Springer, Cham. https://doi.org/10.1007/978-3-319-17088-6_32
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DOI: https://doi.org/10.1007/978-3-319-17088-6_32
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-17087-9
Online ISBN: 978-3-319-17088-6
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