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Sensing mechanisms and electrical property predictions of nanomodified Portland cement composites
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering. (Building Materials)ORCID iD: 0000-0003-0459-7433
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering. (Building Materials)
Silesian University of Technology.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
(English)In: Article in journal (Refereed) Submitted
National Category
Building Technologies Composite Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-97280OAI: oai:DiVA.org:ltu-97280DiVA, id: diva2:1758703
Available from: 2023-05-23 Created: 2023-05-23 Last updated: 2023-05-23
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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