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Role of Carbon Nanofiber on the Electrical Resistivity of Mortar under Compressive Load
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0003-0459-7433
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-7279-6528
The Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
2021 (English)In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052, Vol. 2675, no 9, p. 32-37Article in journal (Refereed) Published
Abstract [en]

A nanomodified cement consisting of particles with in situ synthesized carbon nanofibers was developed to introduce a strong load-sensing capability of the hydrated binder matrix. The material was produced using chemical vapor deposition. The nanomodified cement contained 2.71 wt% of carbon nanofibers (CNFs). The electrical properties of the composite were determined. Several mortar samples were prepared by partially substituting ordinary Portland cement with 2, 4, 6, 8, and 10 wt% of the nanomodified cement. Additionally an ordinary Portland cement mortar was used as reference. The results show that the strongest piezoresistive response and therefore the best load-sensing was obtained for the mortar containing the highest amount of CNFs. This mortar contained 10 wt% of nanomodified cement. The fractional change in electrical resistivity of this mortar was 82% and this mortar had a compressive strength of 28 MPa.

Place, publisher, year, edition, pages
Sage Publications, 2021. Vol. 2675, no 9, p. 32-37
National Category
Other Materials Engineering
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-80859DOI: 10.1177/0361198120947417ISI: 000570875200001Scopus ID: 2-s2.0-85118466588OAI: oai:DiVA.org:ltu-80859DiVA, id: diva2:1469325
Funder
VinnovaSwedish Transport Administration
Note

Validerad;2021;Nivå 2;2021-10-26 (beamah)

Available from: 2020-09-21 Created: 2020-09-21 Last updated: 2023-05-23Bibliographically approved
In thesis
1. Sensing capability of nanomodified Portland cement composites
Open this publication in new window or tab >>Sensing capability of nanomodified Portland cement composites
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Sensing cement-based composites refer to composites that have sensing functionality that can measure several physical and chemical parameters. Sensing cement-based composites are fabricated by incorporating some functional fillers, such as conductive fibers (CFs), carbon nanofibers (CNFs), carbon nanotubes (CNTs), and graphene, into conventional concrete. The self-sensing phenomenon in a material is based on the property of an electrically conductive material to show a change in its electrical resistivity. Several factors affect the electrical resistivity of cement-based composites. These include, for example, the type of added conductive phases, their concentration, the microstructure of the surrounding binder matrix, and its composition or moisture content. Variable stress, strains, relative humidity, temperature, or crack development can all affect conductivity.

A novel material, so-called "nanomodified Portland cement," is an in situ synthesis of carbon-based materials on untreated Portland cement particles. The synthesized method is based on the application of a chemical vapor deposition process (CVD). The nanomodified Portland cement was produced and used as a conductive filler in a sensing cement-based composite to improve the dispersion issue of the carbon-based materials, which have a hydrophobic nature and the tendency to agglomerate in the cement-based composites.

The sensing capability of the nanomodified Portland cement composites was studied and compared with other conductive materials, revealing the percolation threshold and tunneling phenomena as possible explanations for the sensing mechanism with and without mechanical deformation.

The achieved results of this study suggest that nanomodified Portland cement is a promising material for use in sensing cement-based composites as it exhibits high sensitivity to compressive stress and strain, humidity, and temperature. Furthermore, it has the potential to be utilized in the development of integrated monitoring systems for concrete structures.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2023
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
Sensing cementitious composites, nanomodified Portland cement, Carbon nanofibers, CNF, piezoresistive materials, sensor, cement-based sensor, self-monitoring, sensing capability
National Category
Building Technologies Composite Science and Engineering
Research subject
Building Materials
Identifiers
urn:nbn:se:ltu:diva-97288 (URN)978-91-8048-337-7 (ISBN)978-91-8048-338-4 (ISBN)
Public defence
2023-10-11, F 1031, Luleå tekniska universitet, Luleå, 10:00 (English)
Opponent
Supervisors
Funder
VinnovaSwedish Transport AdministrationSvenska Byggbranschens Utvecklingsfond (SBUF)
Available from: 2023-05-23 Created: 2023-05-23 Last updated: 2023-09-22Bibliographically approved

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Buasiri, ThanyaratHabermehl-Cwirzen, KarinCwirzen, Andrzej

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