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Article

Nano-Silica Sol-Gel and Carbon Nanotube Coupling Effect on the Performance of Cement-Based Materials

1
Guangdong Key Provincial Durability Center for Marine Structure, Shenzhen Durability Center for Civil Engineering, Department of Civil Engineering, Shenzhen University, Shenzhen 518060, China
2
Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong, China
3
Dipartimento di Chimica, Materiali e Ingegneria Chimica “G. Natta” via Mancinelli, Politecnico di Milano, 7-20131 Milano, Italy
4
College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2017, 7(7), 185; https://doi.org/10.3390/nano7070185
Received: 13 April 2017 / Revised: 29 June 2017 / Accepted: 11 July 2017 / Published: 14 July 2017
Carbon nanotubes (CNTs) have shown promise for improving the mechanical performance of cement composites through crack-bridging and frictional pull-out. The interactive behaviors between CNTs and cement matrix act are crucial in optimizing the reinforcement of CNTs in cement composites. This study investigates the effects of nano-silica (NS) sol-gel on the interactive behaviors of CNTs and the cement matrix through a series of experiments and analyses. UV-visible spectrometer results show that CNTs are well-dispersed in suspension and the addition of NS has a negligible effect on the stability of CNT dispersion. Calorimetry tests and dynamic mechanical analysis demonstrate the nucleation and frictional performance of CNTs in cement matrix, respectively. The paper shows that the physical adsorption of NS on the CNT surface could result in the acceleration of cement hydration. Morphology observation confirms that a denser interface between CNTs and cement hydrates is formed. Finally, the improved interaction between CNTs and cement hydrates leads to a substantial increase in friction between CNTs and the cement matrix under periodic loading. NS may act as an ideal admixture for improving both the interactive behaviors between CNTs and cement matrix and the damping properties of cement composite. View Full-Text
Keywords: carbon nanotubes (CNTs); nano-silica (NS); interfacial adhesion; nucleation effect; energy dissipation carbon nanotubes (CNTs); nano-silica (NS); interfacial adhesion; nucleation effect; energy dissipation
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MDPI and ACS Style

Li, W.; Ji, W.; Torabian Isfahani, F.; Wang, Y.; Li, G.; Liu, Y.; Xing, F. Nano-Silica Sol-Gel and Carbon Nanotube Coupling Effect on the Performance of Cement-Based Materials. Nanomaterials 2017, 7, 185. https://doi.org/10.3390/nano7070185

AMA Style

Li W, Ji W, Torabian Isfahani F, Wang Y, Li G, Liu Y, Xing F. Nano-Silica Sol-Gel and Carbon Nanotube Coupling Effect on the Performance of Cement-Based Materials. Nanomaterials. 2017; 7(7):185. https://doi.org/10.3390/nano7070185

Chicago/Turabian Style

Li, Weiwen, Weiming Ji, Forood Torabian Isfahani, Yaocheng Wang, Gengying Li, Yi Liu, and Feng Xing. 2017. "Nano-Silica Sol-Gel and Carbon Nanotube Coupling Effect on the Performance of Cement-Based Materials" Nanomaterials 7, no. 7: 185. https://doi.org/10.3390/nano7070185

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