Eighth Congress on Forensic Engineering
Energy Absorption of Cementitious Composites Incorporating Carbon Nanotubes Subjected to Low-Velocity Impact Tests
Publication: Forensic Engineering 2018: Forging Forensic Frontiers
ABSTRACT
Over the last century, researchers have continuously improved concrete mechanical properties, including toughness. Despite substantial improvements in engineering properties, brittleness and low toughness still are two weaknesses of cement-based composites. Reinforcing cementitious composite with carbon nanotubes (CNTs) is an effective method to address both problems. The main objective of this experimental investigation was to assess the effect of synthesizing multi-walled carbon nanotubes (MWCNTs) and cement matrices on the toughness of cementitious nanocomposite. In this research, 0.2 wt%-0.6 wt% of MWCNTs with a water-to-cement ratio of 0.4 were utilized to make a cementitious nanocomposite paste. The drop-weight impact test was used to measure the toughness of the specimens. The results indicated a significant enhancement in energy absorption of the cementitious composites. Additionally, MWCNTs additive decreased crack propagation and debris spatter of the specimen subjected to the impact load. Moreover, the failure mechanism showed less brittleness throughout changing the radial-to-diagonal failure pattern.
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ACKNOWLEDGEMENTS
Financial support was from the National Science Foundation Innovation Corp (NSF I-Corp) under Grant of 1547526, the Graduate and Professional Student Association (GPSA) Grant, and a Howard R. Hughes College of Engineering grant at the University of Nevada, Las Vegas. We appreciate the contributions of Dr. Minghua Ren from Geoscience Department at the University of Nevada, Las Vegas in assisting with FESEM.
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Published In
Forensic Engineering 2018: Forging Forensic Frontiers
Pages: 717 - 725
Editors: Rui Liu, Ph.D., Kent State University, Michael P. Lester, Element Analytical, Alicia E. Díaz de León, and Michael J. Drerup
ISBN (Online): 978-0-7844-8201-8
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© 2018 American Society of Civil Engineers.
History
Published online: Nov 27, 2018
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