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Proceedings Paper

Strain sensitivity of carbon nanotube cement-based composites for structural health monitoring
Author(s): Antonella D'Alessandro; Filippo Ubertini; Simon Laflamme; Marco Rallini; Annibale L. Materazzi; Josè M. Kenny
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Paper Abstract

Cement-based smart sensors appear particularly suitable for monitoring applications, due to their self-sensing abilities, their ease of use, and their numerous possible field applications. The addition of conductive carbon nanofillers into a cementitious matrix provides the material with piezoresistive characteristics and enhanced sensitivity to mechanical alterations. The strain-sensing ability is achieved by correlating the variation of external loads or deformations with the variation of specific electrical parameters, such as the electrical resistance. Among conductive nanofillers, carbon nanotubes (CNTs) have shown promise for the fabrication of self-monitoring composites. However, some issues related to the filler dispersion and the mix design of cementitious nanoadded materials need to be further investigated. For instance, a small difference in the added quantity of a specific nanofiller in a cement-matrix composite can substantially change the quality of the dispersion and the strain sensitivity of the resulting material. The present research focuses on the strain sensitivity of concrete, mortar and cement paste sensors fabricated with different amounts of carbon nanotube inclusions. The aim of the work is to investigate the quality of dispersion of the CNTs in the aqueous solutions, the physical properties of the fresh mixtures, the electromechanical properties of the hardened materials, and the sensing properties of the obtained transducers. Results show that cement-based sensors with CNT inclusions, if properly implemented, can be favorably applied to structural health monitoring.

Paper Details

Date Published: 20 April 2016
PDF: 8 pages
Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 980319 (20 April 2016); doi: 10.1117/12.2218905
Show Author Affiliations
Antonella D'Alessandro, Univ. degli Studi di Perugia (Italy)
Filippo Ubertini, Univ. degli Studi di Perugia (Italy)
Simon Laflamme, Iowa State Univ. (United States)
Marco Rallini, Univ. degli Studi di Perugia (Italy)
Annibale L. Materazzi, Univ. degli Studi di Perugia (Italy)
Josè M. Kenny, Univ. degli Studi di Perugia (Italy)

Published in SPIE Proceedings Vol. 9803:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016
Jerome P. Lynch, Editor(s)

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