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Experimental Investigation on the Effect of Ultrasonication on Dispersion and Mechanical Performance of Multi-Wall Carbon Nanotube-Cement Mortar Composites
Abstract:Due to their remarkable mechanical properties, multi-wall carbon nanotubes (MWCNTs) are considered by many researchers to be a highly promising filler and reinforcement agent for enhanced performance cementitious materials. Currently, however, achieving an effective dispersion of MWCNTs remains a major challenge in developing high performance nano-cementitious composites, since carbon nanotubes tend to form large agglomerates and bundles as a consequence of Van der Waals forces. In this study, effective dispersion of low concentrations of MWCNTs at 0.01%, 0.025%, and 0.05% by weight of cement in the composite was achieved by applying different sonication conditions in combination with the use of polycarboxylate ether as a surfactant. UV-Visible spectroscopy and Transmission electron microscopy (TEM) were used to assess the dispersion of MWCNTs in water, while the dispersion states of MWCNTs within the cement composites and their surface interactions were examined by scanning electron microscopy (SEM). A high sonication intensity applied over a short time period significantly enhanced the dispersion of MWCNTs at initial mixing stages, and 0.025% of MWCNTs wt. of cement, caused 86% and 27% improvement in tensile strength and compressive strength respectively, compared with a plain cement mortar.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1112027Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1489
 Z. S. Metaxa, M. S. Konsta-Gdoutos, and S. P. Shah, "Carbon nanofiber cementitious composites: Effect of debulking procedure on dispersion and reinforcing efficiency," Cement and Concrete Composites, vol. 36, pp. 25-32, 2// 2013.
 A. Y. a. R. K.-A. Salah Altoubat, "Shear Behavior of Macro-Synthetic Fiber-Reinforced Concrete Beams without Stirrups, Materials Journal" vol. 4, 2009.
 N. Ganesan, P. V. Indira, and M. V. Sabeena, "Bond stress slip response of bars embedded in hybrid fibre reinforced high performance concrete," Construction and Building Materials, vol. 50, pp. 108-115, 2014.
 S. Iijima, "Carbon nanotubes: past, present, and future," Physica B: Condensed Matter, vol. 323, pp. 1-5, 2002.
 R. Siddique and A. Mehta, "Effect of carbon nanotubes on properties of cement mortars," Construction and Building Materials, vol. 50, pp. 116-129, 2014.
 Jyoti Bharj, S. S., Subhash Chander, Rabinder Singh (2014). "Role of Dispersion of Multiwalled Carbon Nanotubes on Compressive Strength of Cement Paste." World Academy of Science, Engineering and Technology International Journal of Physical, Nuclear Science and Engineering Vol:8 No:2.
 A. Sobolkina, V. Mechtcherine, V. Khavrus, D. Maier, M. Mende, M. Ritschel, et al., "Dispersion of carbon nanotubes and its influence on the mechanical properties of the cement matrix," Cement and Concrete Composites, vol. 34, pp. 1104-1113, 2012.
 F. Collins, J. Lambert, and W. H. Duan, "The influences of admixtures on the dispersion, workability, and strength of carbon nanotube–OPC paste mixtures," Cement and Concrete Composites, vol. 34, pp. 201-207, 2// 2012.
 O. Mendoza, G. Sierra, and J. I. Tobón, "Effect of the reagglomeration process of multi-walled carbon nanotubes dispersions on the early activity of nanosilica in cement composites," Construction and Building Materials, vol. 54, pp. 550-557, 3/15/ 2014.
 R. K. Abu Al-Rub, A. I. Ashour, and B. M. Tyson, "On the aspect ratio effect of multi-walled carbon nanotube reinforcements on the mechanical properties of cementitious nanocomposites," Construction and Building Materials, vol. 35, pp. 647-655, 10// 2012.
 A. Cwirzen, K. Habermehl-Cwirzen, A. G. Nasibulin, E. I. Kaupinen, P. R. Mudimela, and V. Penttala, "SEM/AFM studies of cementitious binder modified by MWCNT and nano-sized Fe needles," Materials Characterization, vol. 60, pp. 735-740, 7// 2009.
 G. Y. Li, P. M. Wang, and X. Zhao, "Mechanical behavior and microstructure of cement composites incorporating surface-treated multi-walled carbon nanotubes," Carbon, vol. 43, pp. 1239-1245, 2004.
 G. Y. Li, P. M. Wang, and X. Zhao, "Pressure-sensitive properties and microstructure of carbon nanotube reinforced cement composites," Cement and Concrete Composites, vol. 29, pp. 377-382, 5// 2007.
 M. S. Konsta-Gdoutos, Z. S. Metaxa, and S. P. Shah, "Highly dispersed carbon nanotube reinforced cement based materials," Cement and Concrete Research, vol. 40, pp. 1052-1059, 7// 2010.
 M. S. Konsta-Gdoutos, Z. S. Metaxa, and S. P. Shah, "Multi-scale mechanical and fracture characteristics and early-age strain capacity of high performance carbon nanotube/cement nanocomposites," Cement and Concrete Composites, vol. 32, pp. 110-115, 2// 2010.
 B. M. Tyson, R. K. Abu Al-Rub, A. Yazdanbakhsh, and Z. Grasley, "A quantitative method for analyzing the dispersion and agglomeration of nano-particles in composite materials," Composites Part B: Engineering, vol. 42, pp. 1395-1403, 2011.
 T. B. Abu Al-Rub RK, Yazdanbakhsh A, Grasley Z., "Mechanical properties of nanocomposite cement incorporating surface-treated and untreated carbon nanotubes and carbon nanofibers.," ASCE J Nanomech Micromech, vol. 2(1):1–6., 2012.
 B. Zou, S. J. Chen, A. H. Korayem, F. Collins, C. M. Wang, and W. H. Duan, "Effect of ultrasonication energy on engineering properties of carbon nanotube reinforced cement pastes," Carbon, vol. 85, pp. 212-220, 2015.
 O. Mendoza, G. Sierra, and J. I. Tobón, "Influence of super plasticizer and Ca(OH)2 on the stability of functionalized multi-walled carbon nanotubes dispersions for cement composites applications," Construction and Building Materials, vol. 47, pp. 771-778, 10// 2013.
 "EN 197-1. Cement. Part 1: Composition, specifications and conformity criteria for common cements. Brussels, Belgium: European Committee for Standardization; 2000.."