Accelerated carbonation of steel slag monoliths at low CO2 pressure – microstructure and strength development

Nielsen, Peter; Boone, Matthieu; Horckmans, Liesbeth; Snellings, Ruben; Quaghebeur, Mieke

doi:10.1016/j.jcou.2019.10.022

Cited by 107 publications

(26 citation statements)

References 85 publications

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“…Probable reason behind this would be the interaction effect between the porosity changes due to particle packing and carbonation induced pore reduction. Similar results of increase in carbonation without any strength improvement were also observed in previous research, mostly due to the effect of carbonation conditions [29,30].…”

Section: Crushing Strength Of the Granulessupporting

confidence: 90%

Production of artificial aggregates by granulation and carbonation of recycled concrete fines

Kursula

Perumal

Ohenoja

et al. 2022

J Mater Cycles Waste Manag

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There is a growing need to find ways to reuse fine concrete waste from the construction industry. In this study, recycled concrete fines were granulated and used as lightweight aggregates. Ladle slag, a steel industry residue, was used as a co-binder in different ratios (0, 10, 20, and 30%). The materials were blended and granulated, and then the granules were cured in three conditions: ambient condition, humidity chamber, and carbonation chamber. The results showed that the ladle slag content of 30% cured in a humidity chamber produced the strongest granules, with a crushing strength of 127 N, which was 135% greater than a commercial lightweight aggregate. The granules generally had satisfactory density and water absorption with a higher ladle slag content. Carbonation increased the granule strength with a low ladle slag content and decreased the granules’ water absorption. The improved physical and mechanical properties of carbonated granules are attributed to the formation of calcium carbonate during the carbonation process. The granules produced in this study show good potential for use as lightweight aggregates in the construction industry. Graphical abstract

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Section: Crushing Strength Of the Granulessupporting

confidence: 90%

Production of artificial aggregates by granulation and carbonation of recycled concrete fines

Kursula

Perumal

Ohenoja

et al. 2022

J Mater Cycles Waste Manag

View full text Add to dashboard Cite

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“…The current study includes three sub-studies of oil shale ash utilization in building materials; first sub-study is testing of self-cementing properties of all the currently generated OSAs, second sub-study is the clay brick production with oil shale ash to test its performance as opening agent and the last sub-study is on the properties of OSA monoliths obtained by accelerated carbonation, which draws on the recent developments in research of carbonate bonded construction materials [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of New Applications of Oil Shale Ashes in Building Materials

et al. 2020

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Achieving sustainable zero-waste and carbon neutral solutions that contribute to a circular economy is critically important for the long-term prosperity and continuity of traditional carbon-based energy industries. The Estonian oil shale (OS) sector is an example where such solutions are more than welcome. The combustion of OS generates a continuous flow of ashes destined to landfills. In this study, the technical feasibility of producing monolith building materials incorporating different OS ashes from Estonia was evaluated. Three binder systems were studied: self-cementation of the ashes, ceramic sintering in clay brick production and accelerated carbonation of OS ash (OSA) compacts. Results showed that most of the OSAs studied have low self-cementitious properties and these properties were affected by ash fineness and mineralogical composition. In case of clay bricks, OSA addition resulted in a higher porosity and improved insulation properties. The carbonated OSA compacts showed promising compressive strength. Accelerated carbonation of compacted samples was found to be the most promising way for the future utilization of OSAs as sustainable zero-waste and carbon neutral solution.

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“…On the other hand, for aqueous direct carbonation, temperature has a great impact on the crystal nucleation rate, morphology of the final slag product, carbon dioxide solubility in water, and dissolution rate of the slag components (Nielsen et al 2020). The optimal carbonation temperature for aqueous direct carbonation depends on the slag nature and varies significantly for different types of steel slags.…”

Section: Steelmaking Slagmentioning

confidence: 99%

Effluents and residues from industrial sites for carbon dioxide capture: a review

et al. 2022

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The adverse effects of climate change calls for the rapid transformation of manufacturing processes to decrease the emissions of carbon dioxide. In particular, a lower carbon footprint can be achieved by capturing carbon dioxide at the site of emission. Here we review the use of industrial effluents, waste and residues to capture carbon dioxide. Waste include steelmaking slag, municipal solid waste incinerator ashes, combustion fly ash, black liquor, paper mill waste, mining waste, cement waste, construction and demolition waste, waste from the organic industry, and flue gas desulfurization gypsum waste. Capture capacities range from 2 to 800 kg of carbon dioxide per ton of waste, depending on processes, waste type and conditions. Cement waste and flue gas desulfurization gypsum waste show the highest capture capacity per ton of waste.

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Accelerated carbonation of steel slag monoliths at low CO2 pressure – microstructure and strength development

Cited by 107 publications

References 85 publications

Production of artificial aggregates by granulation and carbonation of recycled concrete fines

Production of artificial aggregates by granulation and carbonation of recycled concrete fines

Evaluation of New Applications of Oil Shale Ashes in Building Materials

Effluents and residues from industrial sites for carbon dioxide capture: a review

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