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Accelerated Carbonation of Binders Containing SCM at High CO2 Concentration
University of Borås, Borås, Sweden; RISE Research Institutes of Sweden, Infrastructure and Concrete Technology, Material Design, Brinellgatan 4, 50115 Borås, Sweden.
University of Borås, Borås, Sweden; RISE Research Institutes of Sweden, Infrastructure and Concrete Technology, Material Design, Brinellgatan 4, 50115 Borås, Sweden.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand. Schwenk Sverige AB, Hyllie Stationstorg 31, Malmö, Sweden.ORCID-id: 0000-0003-1904-7426
2023 (engelsk)Inngår i: Nordic Concrete Research, ISSN 0800-6377, Vol. 69, nr 2, s. 1-10, artikkel-id 1Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Accelerated carbonation of recycled concrete aggregates (RCA) could be an efficient way to reduce the carbon footprint. High CO2-concentration under optimal relative humidity could accelerate the CO2 binding capacity of the hydrated cement paste in the RCA. The latter is the topic of this paper. The study looks into the forced carbonation of crushed cement pastes as a basis to understand the CO2 uptake in relation to various binders containing supplementary cementitious materials (SCM) such as fly ash (FA) and ground granulated blast furnace slag (GGBS). Samples include three cement pastes: ordinary Portland cement, substitution rate of 30 % FA and 50 % GGBS respectively at a water/binder ratio of 0.45. All binders were graded to 0/2, 2/4 and 4/8 mm fraction sizes and preconditioned before exposed to CO2 concentration of 10 % under controlled temperature at 20 C-degrees and 65 % RH. All tested binders presented a high CO2 uptake within the first hours of exposure with clear differences concerning the fraction sizes and the composition. The phase content before and after carbonation was observed by X-ray diffraction and the portlandite and calcite were quantified by thermogravimetric analyses and their derivative curves for fraction size 4/8 mm.

sted, utgiver, år, opplag, sider
Nordic Concrete Federation , 2023. Vol. 69, nr 2, s. 1-10, artikkel-id 1
Emneord [en]
Accelerated carbonation, SCM, TGA, XRD, Carbon sink
HSV kategori
Forskningsprogram
Byggmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-103987DOI: 10.2478/ncr-2023-0004ISI: 001137272000004OAI: oai:DiVA.org:ltu-103987DiVA, id: diva2:1832322
Forskningsfinansiär
Swedish Research Council Formas
Merknad

Validerad;2024;Nivå 1;2024-04-08 (hanlid);

Full text license: CC BY-NC-ND

Tilgjengelig fra: 2024-01-29 Laget: 2024-01-29 Sist oppdatert: 2024-04-16bibliografisk kontrollert

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