Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Activated clays as supplementary cementitious material
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0003-1586-965x
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0002-4422-0430
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0003-1904-7426
2021 (English)Report (Other academic)
Abstract [en]

Concrete is the most used material in the world (buildings, infrastructure, transport) and its production is continuously increasing over the years because of the growth of the population, the urbanisation, and the infrastructure development. Unfortunately, the production of the main component of concrete, cement, causes inevitable CO2 emissions, accounting for 6% of the total anthropogenic CO2 emissions. The most efficient way to reduce this environmental footprint is to reduce the clinker factor in cement or to reduce the cement content in concrete, which is done by replacing a part of the cement by Supplementary Cementitious Materials (SCM). However, the most commonly used SCM (fly ash and ground granulated blast furnace slag) are only available in a low amount in Sweden. New SCM must be find.The objective of this project was to evaluate the potential of using Swedish clays as SCM. An inventory of available clays was performed in a first step. Then, as clays need to be activated before use with cement, different activation procedures were tested. A selection of clays was mixed with cement either in binary mixes (cement + activated clay) or in ternary mixes (cement + activated clay + limestone). The hydration properties and the microstructure of binder pastes were investigated, as well as the strength development of mortars. Finally, a life cycle analysis (LCA) was performed to evaluate the positive impact on the CO2 emissions when clays are used as SCM.The results of the project highlighted the good potential of using Swedish clays in concrete to decrease the environmental footprint due to the cement and concrete industries. In particular, the clays can be activated through mechanical and thermal treatment, depending on the type of clay. Thermal treatment in temperature ranges between 600-800 degrees is preferred for sedimentary clays, while a mechanical treatment by ball milling gives better results with marine clays. A satisfactory strength is achieved in mortar samples cast with calcined clays. This was achieved by replacing the cement with 30% of calcined clay and 15% of limestone. Finally, the LCA calculation shows that the use of clay in a ternary binder lead to a reduction of approx. 34% of the CO2 emissions.

Place, publisher, year, edition, pages
2021. , p. 72
Series
RISE Rapport ; 2021:25
Keywords [en]
Cement; Clay; Activation; Supplementary cementitious material; sustainability
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-52509ISBN: 978-91-89385-10-8 (electronic)OAI: oai:DiVA.org:ri-52509DiVA, id: diva2:1534080
Available from: 2021-03-04 Created: 2021-03-04 Last updated: 2024-01-05Bibliographically approved

Open Access in DiVA

fulltext(34802 kB)334 downloads
File information
File name FULLTEXT01.pdfFile size 34802 kBChecksum SHA-512
c7c5627f28e8e58e06165c6b5b854d128b01c1ba74e9e106b602aaecbc0f390dbb4547f08639c031d0a676e3cf8be3771c3abefc9dfce54e097e4c7b6ec3a9f8
Type fulltextMimetype application/pdf

Authority records

Plusquellec, GillesBabaahmadi, ArezouMueller, Urs

Search in DiVA

By author/editor
Plusquellec, GillesBabaahmadi, ArezouMueller, Urs
By organisation
Infrastructure and concrete technology
Other Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 334 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1476 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf