Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Mechanical activation of clay: a novel route to sustainable cementitious binders
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.ORCID-id: 0000-0002-6797-9300
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

EU Sustainable Development Strategy planned to achieve improvement of life-quality by promoting sustainable production and consumption of raw materials. On November 2018, EU Commission presented a long-term strategy, aiming among others a climate-neutral economy by 2050. Cement production is contributing to 6-10% of the anthropogenic CO2 emissions. Thus, several strategies for total or partial replacement of Portland cement in concrete production have been developed. The use of supplementary cementitious materials (SCM) and alkali-activated materials (AAM) is considered the most efficient countermeasure to diminish CO2 emissions. The broadening of knowledge with particular attention to the sustainable goals is the primary requirement to be fulfilled when novel materials are investigated. This study aims to develop a novel clay-based binder that can be used as a sustainable alternative to produce SCM as well as AAM. Clay is a commonly occurring material, with large deposits worldwide. However, natural clay has a low reactivity and various compositions, depending, e.g. on the weathering conditions. The present research aims exactly at enhancing the reactivity of natural clays occurring in Sweden subjecting them to mechanical activation in a planetary ball mill. Ball milling (BM) is considered a clean technology able to enhance the reactivity of crystalline materials without resorting to high processing temperatures or additional chemicals. BM was able to induce amorphization in clay minerals and to transform the layered platy morphology to spherical shape particles. The efficiency of the process was strictly related to the used process parameters. Higher ball to processed powder (B/P) ratio, longer time of grinding and higher grinding speeds increased the degree of the obtained amorphization. However, an undesired extensive caking and agglomeration occurred in certain setups. The potential of activated clay as a SCM was investigated in specific case studies. The measured compressive strength results showed a direct correlation between the enhanced amorphization degree of the mechanically activated clay and the increased strength values. The pozzolanic activity was induced and enhanced after the mechanical activation of the clay. The reactivity was assessed by the strength activity index (SAI). Furthermore, preliminary tests have shown that the alkali activation of the processed clays produced solidified matrixes with considerable strength.

sted, utgiver, år, opplag, sider
Luleå University of Technology, 2019.
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Emneord [en]
clay, sustainability, mechanical activation, ball milling, supplementary cementitious materials, alkali-activated materials
HSV kategori
Forskningsprogram
Byggmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-76362ISBN: 978-91-7790-471-7 (tryckt)ISBN: 978-91-7790-472-4 (digital)OAI: oai:DiVA.org:ltu-76362DiVA, id: diva2:1360317
Presentation
2019-12-11, C305, Luleå University of Technology, Luleå, 08:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-10-14 Laget: 2019-10-11 Sist oppdatert: 2019-11-27bibliografisk kontrollert

Open Access i DiVA

fulltext(21959 kB)33 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 21959 kBChecksum SHA-512
f134e632191066f94c919181828afa73750b46d7d48d85e9e47e7cbe4c4e219530f1f180e36f06ebceaf7695bba7ff74079bdb5cf5190256678562142250241d
Type fulltextMimetype application/pdf

Søk i DiVA

Av forfatter/redaktør
Tole, Ilda
Av organisasjonen

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 33 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 87 treff
RefereraExporteraLink to record
Permanent link

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