Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Piezoresistive Load Sensing and Percolation Phenomena in Portland Cement Composite Modified with In-Situ Synthesized Carbon Nanofibers
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.ORCID-id: 0000-0003-0459-7433
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.ORCID-id: 0000-0001-7279-6528
Silesian University of Technology, The Institute of Engineering Materials and Biomaterials, Poland.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.ORCID-id: 0000-0001-6287-2240
2019 (Engelska)Ingår i: Nanomaterials, E-ISSN 2079-4991, Vol. 9, nr 4, artikel-id 594Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Carbon nanofibers (CNFs) were directly synthesized on Portland cement particles by chemical vapor deposition. The so-produced cements contained between 2.51–2.71 wt% of CNFs; depending on the production batch. Several mortar mixes containing between 0 and 10 wt% of the modified cement were produced and the electrical properties at various ages and the load sensing capabilities determined. The percolation threshold related to the electrical conductivity was detected and corresponded to the amount of the present CNFs, 0.271, 0.189, 0.135 and 0.108 wt%. The observed threshold depended on the degree of hydration of the Portland cement. The studied mortars showed a strong piezoresistive response to the applied compressive load reaching a 17% change of the electrical resistivity at an applied load of 3.5 MPa and 90% at 26 MPa. This initial study showed that the studied material is potentially suitable for future development of novel fully integrated monitoring systems for concrete structures.

Ort, förlag, år, upplaga, sidor
MDPI, 2019. Vol. 9, nr 4, artikel-id 594
Nyckelord [en]
Carbon nanofibers, CVD, percolation, piezoresistive response, compressive load
Nationell ämneskategori
Annan materialteknik
Forskningsämne
Byggmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-73574DOI: 10.3390/nano9040594ISI: 000467768800110PubMedID: 30974888Scopus ID: 2-s2.0-85065309577OAI: oai:DiVA.org:ltu-73574DiVA, id: diva2:1303907
Forskningsfinansiär
Vinnova, 2016-03285Trafikverket, TRV2017/57560
Anmärkning

Validerad;2019;Nivå 2;2019-04-15 (oliekm)

Tillgänglig från: 2019-04-11 Skapad: 2019-04-11 Senast uppdaterad: 2023-05-23Bibliografiskt granskad
Ingår i avhandling
1. Sensing capability of nanomodified Portland cement composites
Öppna denna publikation i ny flik eller fönster >>Sensing capability of nanomodified Portland cement composites
2023 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2023
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nyckelord
Sensing cementitious composites, nanomodified Portland cement, Carbon nanofibers, CNF, piezoresistive materials, sensor, cement-based sensor, self-monitoring, sensing capability
Nationell ämneskategori
Husbyggnad Kompositmaterial och -teknik
Forskningsämne
Byggmaterial
Identifikatorer
urn:nbn:se:ltu:diva-97288 (URN)978-91-8048-337-7 (ISBN)978-91-8048-338-4 (ISBN)
Disputation
2023-10-11, F 1031, Luleå tekniska universitet, Luleå, 10:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
VinnovaTrafikverketSvenska Byggbranschens Utvecklingsfond (SBUF)
Tillgänglig från: 2023-05-23 Skapad: 2023-05-23 Senast uppdaterad: 2023-09-22Bibliografiskt granskad

Open Access i DiVA

fulltext(1004 kB)151 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1004 kBChecksumma SHA-512
183fdf8a66aa257929e39ac1259d063a1dbe536734ceacbd3bad4f3603b2ef69d96af9422a50510741fde6da969c9de1cc1366c388c867d57059dcbc68e33615
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextPubMedScopus

Person

Buasiri, ThanyaratHabermehl-Cwirzen, KarinCwirzen, Andrzej

Sök vidare i DiVA

Av författaren/redaktören
Buasiri, ThanyaratHabermehl-Cwirzen, KarinCwirzen, Andrzej
Av organisationen
Byggkonstruktion och brand
I samma tidskrift
Nanomaterials
Annan materialteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 151 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
pubmed
urn-nbn

Altmetricpoäng

doi
pubmed
urn-nbn
Totalt: 185 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf