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Effects of Carbon Nanofibers and Carboxyl Functionalized Multi-Walled Carbon Nanotubes on Mechanical Damping Behavior of Cement Paste

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Different ratios of carbon nanofibers (CNF) and carboxyl functionalized multi-walled carbon nanotubes (CMWCNT), dispersed by the polycarboxylate based superplasticizer, were added in this study to investigate mechanical damping behavior of cement paste. The additions of CNF and CMWCNT simultaneously improved loss tangent, storage modulus and loss modulus of cement paste to different extents at 0.2 Hz the frequency. The cement paste exhibited higher storage modulus and loss modulus with addition of CNF. The addition of CMWCNT provided higher loss tangent but lower modulus compared to the CNF modified cement paste. The damping mechanisms for cement incorporated with CNF and CMWCNT were explained by the effective “stick-slip” motion which was generated by the possible sliding among the nanofilaments at the interface between the fibers and cement particles. The enhanced stiffness was attributed to the optimized microstructure and bridge effect induced by the nanoscale nanofilaments. Both total porosity and mesoporosity decreased due to the nano-filler effect from the carbon nanofilaments. The SEM technique indicated that excessive addition of CNF/CMWCNT should be avoided to minimize possible fiber agglomeration in the cement matrix.
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Keywords: CNF; CNT; Cement; Damping

Document Type: Research Article

Affiliations: Key Lab of Structure Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Heilongjiang, Harbin, 150090, China; School of Civil Engineering, Harbin Institute of Technology, Heilongjiang, Harbin, 150090, China

Publication date: January 1, 2019

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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