A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of Carbon Nanotubes Dispersion Degree on the Piezo-Resistive Behavior of Self-sensing Cementitious Composites
https://orcid.org/http://orcid.org/0000-0003-3122-6312
https://orcid.org/http://orcid.org/0000-0002-4490-9588
https://orcid.org/http://orcid.org/0000-0001-7552-267X
https://orcid.org/http://orcid.org/0000-0001-5867-4452
https://orcid.org/http://orcid.org/0000-0002-4241-1321
Literature reports indicate that Carbon Nanotubes (CNT) are one of the best conductive fillers for self-sensing cementitious composites (SSCC) due to their excellent electrical conductivity. However, due to their Van der Waals interactions and hydrophobic nature, it is a challenge to properly disperse them throughout the cement matrix. Among the known dispersion methods, the use of ultrasonic energy in aqueous media, combined with superplasticizers, has been found to yield good performance. Nevertheless, high amounts of ultrasonic energy can damage the structural integrity of CNT and modify their electrical properties. This work explores how the CNT dispersion degree, obtained from the use of different amounts of ultrasonic energy in aqueous media, affects the self-sensing response of SSCC. CNT aqueous solutions were sonicated in presence of a naphthalene-based superplasticizer and evaluated by means of UV-Vis spectroscopy to characterize their dispersion degree. Cement pastes with different CNT contents were manufactured for each sonication energy and submitted to resistivity and piezo-resistivity testing. Satisfactory self-sensing results were obtained using both high and low sonication energies, associated with good and poor dispersion degrees of the CNT respectively. It was concluded that poorly dispersed CNT can be used to manufacture SSCC by adjusting the CNT concentration.
Influence of Carbon Nanotubes Dispersion Degree on the Piezo-Resistive Behavior of Self-sensing Cementitious Composites
https://orcid.org/http://orcid.org/0000-0003-3122-6312
https://orcid.org/http://orcid.org/0000-0002-4490-9588
https://orcid.org/http://orcid.org/0000-0001-7552-267X
https://orcid.org/http://orcid.org/0000-0001-5867-4452
https://orcid.org/http://orcid.org/0000-0002-4241-1321
Literature reports indicate that Carbon Nanotubes (CNT) are one of the best conductive fillers for self-sensing cementitious composites (SSCC) due to their excellent electrical conductivity. However, due to their Van der Waals interactions and hydrophobic nature, it is a challenge to properly disperse them throughout the cement matrix. Among the known dispersion methods, the use of ultrasonic energy in aqueous media, combined with superplasticizers, has been found to yield good performance. Nevertheless, high amounts of ultrasonic energy can damage the structural integrity of CNT and modify their electrical properties. This work explores how the CNT dispersion degree, obtained from the use of different amounts of ultrasonic energy in aqueous media, affects the self-sensing response of SSCC. CNT aqueous solutions were sonicated in presence of a naphthalene-based superplasticizer and evaluated by means of UV-Vis spectroscopy to characterize their dispersion degree. Cement pastes with different CNT contents were manufactured for each sonication energy and submitted to resistivity and piezo-resistivity testing. Satisfactory self-sensing results were obtained using both high and low sonication energies, associated with good and poor dispersion degrees of the CNT respectively. It was concluded that poorly dispersed CNT can be used to manufacture SSCC by adjusting the CNT concentration.
Influence of Carbon Nanotubes Dispersion Degree on the Piezo-Resistive Behavior of Self-sensing Cementitious Composites
https://orcid.org/http://orcid.org/0000-0003-3122-6312
https://orcid.org/http://orcid.org/0000-0002-4490-9588
https://orcid.org/http://orcid.org/0000-0001-7552-267X
https://orcid.org/http://orcid.org/0000-0001-5867-4452
https://orcid.org/http://orcid.org/0000-0002-4241-1321
Literature reports indicate that Carbon Nanotubes (CNT) are one of the best conductive fillers for self-sensing cementitious composites (SSCC) due to their excellent electrical conductivity. However, due to their Van der Waals interactions and hydrophobic nature, it is a challenge to properly disperse them throughout the cement matrix. Among the known dispersion methods, the use of ultrasonic energy in aqueous media, combined with superplasticizers, has been found to yield good performance. Nevertheless, high amounts of ultrasonic energy can damage the structural integrity of CNT and modify their electrical properties. This work explores how the CNT dispersion degree, obtained from the use of different amounts of ultrasonic energy in aqueous media, affects the self-sensing response of SSCC. CNT aqueous solutions were sonicated in presence of a naphthalene-based superplasticizer and evaluated by means of UV-Vis spectroscopy to characterize their dispersion degree. Cement pastes with different CNT contents were manufactured for each sonication energy and submitted to resistivity and piezo-resistivity testing. Satisfactory self-sensing results were obtained using both high and low sonication energies, associated with good and poor dispersion degrees of the CNT respectively. It was concluded that poorly dispersed CNT can be used to manufacture SSCC by adjusting the CNT concentration.
Influence of Carbon Nanotubes Dispersion Degree on the Piezo-Resistive Behavior of Self-sensing Cementitious Composites
RILEM Bookseries
Jędrzejewska, Agnieszka (editor) / Kanavaris, Fragkoulis (editor) / Azenha, Miguel (editor) / Benboudjema, Farid (editor) / Schlicke, Dirk (editor) / de Aguiar Junior, Claudio José (author) / de Almeida Carísio, Pedro (author) / Soares, Carlos Fernando Teodósio (author) / Filho, Romildo Dias Toledo (author) / Reales, Oscar Mendoza (author)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
2023-06-09
12 pages
Article/Chapter (Book)
Electronic Resource
English
Synthesis, characterisation and performance of piezo-resistive cementitious nanocomposites
| Online Contents | 2017
Carbon Nanotubes-Engineered Cementitious Composites
| Springer Verlag | 2019
A review on carbon-based self-sensing cementitious composites
| Elsevier | 2020
A review on carbon-based self-sensing cementitious composites
| Elsevier | 2020